Code
P1601
ALFA ROMEO
P — Powertrain
Cruise control switch-off fault
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for ALFA ROMEO
89
Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
ALFA ROMEO
-
ALFA ROMEO: 2024
-
ALFA ROMEO: 2023
-
Stelvio
-
ALFA ROMEO: 2022
-
Stelvio
-
ALFA ROMEO: 2021
-
Stelvio
-
ALFA ROMEO: 2020
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Code
P1601
BUICK
P — Powertrain
Serial Communication Problem With Devise 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
CADILLAC
P — Powertrain
Serial Communication Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for CADILLAC
206
Browse 206 CADILLAC manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
CADILLAC
-
CADILLAC: 2021
-
Escalade
- Luxury, 3.0L Eng VIN T, 4WD
- Luxury, 3.0L Eng VIN T, RWD
- Luxury, 6.2L Eng VIN L, 4WD
- Luxury, 6.2L Eng VIN L, RWD
- Premium Luxury, 3.0L Eng VIN T, 4WD
- Premium Luxury, 3.0L Eng VIN T, RWD
- Premium Luxury, 6.2L Eng VIN L, 4WD
- Premium Luxury, 6.2L Eng VIN L, RWD
- Premium Luxury Platinum, 3.0L Eng VIN T, 4WD
- Premium Luxury Platinum, 3.0L Eng VIN T, RWD
- Premium Luxury Platinum, 6.2L Eng VIN L, 4WD
- Premium Luxury Platinum, 6.2L Eng VIN L, RWD
- Sport, 3.0L Eng VIN T, 4WD
- Sport, 3.0L Eng VIN T, RWD
- Sport, 6.2L Eng VIN L, 4WD
- Sport, 6.2L Eng VIN L, RWD
- Sport Platinum, 3.0L Eng VIN T, 4WD
- Sport Platinum, 3.0L Eng VIN T, RWD
- Sport Platinum, 6.2L Eng VIN L, 4WD
- Sport Platinum, 6.2L Eng VIN L, RWD
-
Escalade ESV
- Luxury, 3.0L Eng VIN T, 4WD
- Luxury, 3.0L Eng VIN T, RWD
- Luxury, 6.2L Eng VIN L, 4WD
- Luxury, 6.2L Eng VIN L, RWD
- Premium Luxury, 3.0L Eng VIN T, 4WD
- Premium Luxury, 3.0L Eng VIN T, RWD
- Premium Luxury, 6.2L Eng VIN L, 4WD
- Premium Luxury, 6.2L Eng VIN L, RWD
- Premium Luxury Platinum, 3.0L Eng VIN T, 4WD
- Premium Luxury Platinum, 3.0L Eng VIN T, RWD
- Premium Luxury Platinum, 6.2L Eng VIN L, 4WD
- Premium Luxury Platinum, 6.2L Eng VIN L, RWD
- Sport, 3.0L Eng VIN T, 4WD
- Sport, 3.0L Eng VIN T, RWD
- Sport, 6.2L Eng VIN L, 4WD
- Sport, 6.2L Eng VIN L, RWD
- Sport Platinum, 3.0L Eng VIN T, 4WD
- Sport Platinum, 3.0L Eng VIN T, RWD
- Sport Platinum, 6.2L Eng VIN L, 4WD
- Sport Platinum, 6.2L Eng VIN L, RWD
-
CADILLAC: 2020
-
CADILLAC: 2019
-
CT6
- Luxury, 2.0L Eng VIN K · 2.0L Eng VIN K2019: CT6 Luxury
- Luxury, 3.6L Eng VIN S · 3.6L Eng VIN S2019: CT6 Luxury
- Platinum, 3.0L Eng VIN 6 · 3.0L Eng VIN 62019: CT6 Platinum
- Platinum, 4.2L Eng VIN J · 4.2L Eng VIN J2019: CT6 Platinum
- Premium Luxury, 2.0L Eng VIN K · 2.0L Eng VIN K2019: CT6 Premium Luxury
- Premium Luxury, 3.6L Eng VIN S · 3.6L Eng VIN S2019: CT6 Premium Luxury
- Sport
- V
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Code
P1601
CHEVROLET
P — Powertrain
Serial Communication Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for CHEVROLET
456
Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
CHEVROLET
-
CHEVROLET: 2020
-
Camaro
- LS, Automatic Trans
- LS, Standard Trans
- LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans
- LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans
- LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans
- LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans
- LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans
- LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans
- LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans
- LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans
- LT1, 2D Convertible, Automatic Trans
- LT1, 2D Convertible, Standard Trans
- LT1, 2D Coupe, Automatic Trans
- LT1, 2D Coupe, Standard Trans
- SS, 2D Convertible, Automatic Trans
- SS, 2D Convertible, Standard Trans
- SS, 2D Coupe, Automatic Trans
- SS, 2D Coupe, Standard Trans
- ZL1, 2D Convertible, Automatic Trans
- ZL1, 2D Convertible, Standard Trans
- ZL1, 2D Coupe, Automatic Trans
- ZL1, 2D Coupe, Standard Trans
-
Colorado
- 2020 Colorado Base
- LT, 4D Pickup Crew Cab, 2.5L Eng VIN A · 2.5L Eng VIN A2020: Colorado LT
- LT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, 4WD
- LT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, RWD
- LT, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- LT, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- LT, 4D Pickup Extra Cab, 2.5L Eng VIN A, 4WD
- LT, 4D Pickup Extra Cab, 2.5L Eng VIN A, RWD
- LT, 4D Pickup Extra Cab, 3.6L Eng VIN N, 4WD
- LT, 4D Pickup Extra Cab, 3.6L Eng VIN N, RWD
- WT, 4D Pickup Crew Cab, 2.5L Eng VIN A · 2.5L Eng VIN A2020: Colorado WT
- WT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, 4WD
- WT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, RWD
- WT, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- WT, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- WT, 4D Pickup Extra Cab, 2.5L Eng VIN A, 4WD
- WT, 4D Pickup Extra Cab, 2.5L Eng VIN A, RWD
- WT, 4D Pickup Extra Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado WT
- WT, 4D Pickup Extra Cab, 3.6L Eng VIN N, 4WD
- WT, 4D Pickup Extra Cab, 3.6L Eng VIN N, RWD
- Z71, 4D Pickup Crew Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado Z71
- Z71, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- Z71, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- Z71, 4D Pickup Extra Cab
- ZR2, 4D Pickup Crew Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado ZR2
- ZR2, 4D Pickup Crew Cab, 3.6L Eng VIN N · 3.6L Eng VIN N2020: Colorado ZR2
- ZR2, 4D Pickup Extra Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado ZR2
- ZR2, 4D Pickup Extra Cab, 3.6L Eng VIN N · 3.6L Eng VIN N2020: Colorado ZR2
-
Corvette
-
Express 2500
- Base, Van Cargo, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 Base
- Base, Van Cargo, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo, 4.3L Eng VIN P, Gas
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 Base
- Base, Van Cargo Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 Base
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 Base
- LS, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 LS
- LS, 4.3L Eng VIN P, Gas/Ethanol
- LS, 4.3L Eng VIN P, Gas
- LS, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, 6.0L Eng VIN B, Gas/Ethanol
- LS, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 LS
- LT, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 LT
- LT, 4.3L Eng VIN P, Gas/Ethanol
- LT, 4.3L Eng VIN P, Gas
- LT, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, 6.0L Eng VIN B, Gas/Ethanol
- LT, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 LT
-
Express 3500
- Base, Cutaway, 4.3L Eng VIN P, Gas/Ethanol
- Base, Cutaway, 4.3L Eng VIN P, Gas
- Base, Cutaway, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Cutaway, 6.0L Eng VIN B, Gas
- Base, Cutaway, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- Base, Van Cargo, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 Base
- Base, Van Cargo, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo, 4.3L Eng VIN P, Gas
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- Base, Van Cargo Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 Base
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- LS, Van Passenger, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LS
- LS, Van Passenger, 4.3L Eng VIN P, Gas/Ethanol
- LS, Van Passenger, 4.3L Eng VIN P, Gas
- LS, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol
- LS, Van Passenger, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LS
- LS, Van Passenger Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LS
- LS, Van Passenger Extended, 4.3L Eng VIN P, Gas/Ethanol
- LS, Van Passenger Extended, 4.3L Eng VIN P, Gas
- LS, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol
- LS, Van Passenger Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LS
- LT, Van Passenger, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LT
- LT, Van Passenger, 4.3L Eng VIN P, Gas/Ethanol
- LT, Van Passenger, 4.3L Eng VIN P, Gas
- LT, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol
- LT, Van Passenger, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LT
- LT, Van Passenger Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LT
- LT, Van Passenger Extended, 4.3L Eng VIN P, Gas/Ethanol
- LT, Van Passenger Extended, 4.3L Eng VIN P, Gas
- LT, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol
- LT, Van Passenger Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LT
-
Silverado 1500
- Custom, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- Custom, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- Custom, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD
- Custom, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD
- Custom, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD
- Custom, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD
- Custom, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- Custom, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- Custom, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD
- Custom, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD
- Custom, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD
- Custom, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD
- Custom Trail Boss, 4D Pickup Crew Cab, 4.3L Eng VIN H · 4.3L Eng VIN H2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Crew Cab, 5.3L Eng VIN F · 5.3L Eng VIN F2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 4.3L Eng VIN H · 4.3L Eng VIN H2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 5.3L Eng VIN F · 5.3L Eng VIN F2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 Custom Trail Boss
- High Country, 3.0L Eng VIN T, 4WD
- High Country, 3.0L Eng VIN T, RWD
- High Country, 5.3L Eng VIN D, 4WD
- High Country, 5.3L Eng VIN D, RWD
- High Country, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 High Country
- LT, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- LT, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- LT, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- LT, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- LT, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- LT, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- LT, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- LT, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- LT, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- LT, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- LT, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- LT, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- LT Trail Boss, 5.3L Eng VIN D · 5.3L Eng VIN D2020: Silverado 1500 LT Trail Boss
- LT Trail Boss, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LT Trail Boss
- LTZ, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- LTZ, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- LTZ, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- LTZ, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- LTZ, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LTZ
- LTZ, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- LTZ, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- LTZ, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- LTZ, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- LTZ, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LTZ
- RST, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- RST, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- RST, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- RST, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- RST, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- RST, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- RST, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 RST
- RST, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- RST, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- RST, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- RST, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- RST, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- RST, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- RST, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 RST
- SSV, 4WD, Gas
- SSV, 4WD, Gas/Ethanol
- SSV, RWD, Gas
- SSV, RWD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, 4WD, Gas
- WT, 2D Pickup, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, RWD, Gas
- WT, 2D Pickup, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 2D Pickup, 5.3L Eng VIN F, 4WD, Gas
- WT, 2D Pickup, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 2D Pickup, 5.3L Eng VIN F, RWD, Gas
- WT, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- WT, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD, Gas
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD, Gas
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD, Gas
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD, Gas
- WT, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- WT, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD, Gas
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD, Gas
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD, Gas
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD, Gas
-
Silverado 2500 HD
- Custom, 4D Pickup Crew Cab, 4WD
- Custom, 4D Pickup Crew Cab, RWD
- Custom, 4D Pickup Extra Cab, 4WD
- Custom, 4D Pickup Extra Cab, RWD
- High Country, 6.6L Eng VIN 7 · 6.6L Eng VIN 72020: Silverado 2500 HD High Country
- High Country, 6.6L Eng VIN Y · 6.6L Eng VIN Y2020: Silverado 2500 HD High Country
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, RWD
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD
- WT, 2D Pickup, 6.6L Eng VIN 7, 4WD
- WT, 2D Pickup, 6.6L Eng VIN 7, RWD
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
-
Silverado 3500 HD
- High Country, 6.6L Eng VIN 7 · 6.6L Eng VIN 72020: Silverado 3500 HD High Country
- High Country, 6.6L Eng VIN Y · 6.6L Eng VIN Y2020: Silverado 3500 HD High Country
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, RWD
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, RWD
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, RWD
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LTZ, 6.6L Eng VIN 7, 4WD
- LTZ, 6.6L Eng VIN 7, RWD
- LTZ, 6.6L Eng VIN Y, 4WD
- LTZ, 6.6L Eng VIN Y, RWD
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, RWD
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN 7, 4WD
- WT, 2D Pickup, 6.6L Eng VIN 7, RWD
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, RWD
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
-
Suburban
- FL, 4WD, Gas
- FL, 4WD, Gas/Ethanol
- FL, RWD, Gas
- FL, RWD, Gas/Ethanol
- LS, 4WD, Gas
- LS, 4WD, Gas/Ethanol
- LS, RWD, Gas
- LS, RWD, Gas/Ethanol
- LT, 4WD, Gas
- LT, 4WD, Gas/Ethanol
- LT, RWD, Gas
- LT, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas
- Premier, 5.3L Eng VIN C, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, RWD, Gas
- Premier, 6.2L Eng VIN J, 4WD
- Premier, 6.2L Eng VIN J, RWD
-
Tahoe
- FL, 4WD, Gas
- FL, 4WD, Gas/Ethanol
- FL, RWD, Gas
- FL, RWD, Gas/Ethanol
- LS, 4WD, Gas
- LS, 4WD, Gas/Ethanol
- LS, RWD, Gas
- LS, RWD, Gas/Ethanol
- LT, 4WD, Gas
- LT, 4WD, Gas/Ethanol
- LT, RWD, Gas
- LT, RWD, Gas/Ethanol
- PPV, 4WD, Gas
- PPV, 4WD, Gas/Ethanol
- PPV, RWD, Gas
- PPV, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas
- Premier, 5.3L Eng VIN C, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, RWD, Gas
- Premier, 6.2L Eng VIN J, 4WD
- Premier, 6.2L Eng VIN J, RWD
- SSV, Gas
- SSV, Gas/Ethanol
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Code
P1601
CITROEN
P — Powertrain
Ignition-on ECU supply control
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1601
DAEWOO
P — Powertrain
Ecu l line mal
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
DAEWOO
-
DAEWOO: 2001
-
Leganza
-
DAEWOO: 2000
-
Leganza
-
DAEWOO: 1999
-
Lanos
- S, 2D Hatchback, Automatic
- S, 2D Hatchback, Standard
- S, 4D Sedan, Automatic
- S, 4D Sedan, Standard
- SE, 2D Hatchback, Automatic
- SE, 2D Hatchback, Standard
- SE, 4D Sedan, Automatic
- SE, 4D Sedan, Standard
- SX, 2D Hatchback, Automatic
- SX, 2D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
-
Leganza
-
Nubira
- CDX, 4D Hatchback, Automatic
- CDX, 4D Hatchback, Standard
- CDX, 4D Sedan, Automatic
- CDX, 4D Sedan, Standard
- CDX, 4D Wagon, Automatic
- CDX, 4D Wagon, Standard
- SX, 4D Hatchback, Automatic
- SX, 4D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
- SX, 4D Wagon, Automatic
- SX, 4D Wagon, Standard
-
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Code
P1601
DAIHATSU
P — Powertrain
Keyless communication (code disagreement / communication error)
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
DS
P — Powertrain
Ignition-on ECU supply control
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
FIAT
P — Powertrain
Cruise control switch-off fault
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for FIAT
26
Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
FIAT
-
FIAT: 2022
-
500X
-
-
FIAT: 2021
-
500X
-
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Code
P1601
GM
P — Powertrain
Serial Communication Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
GMC
P — Powertrain
Serial Communication Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
HUMMER
P — Powertrain
Serial Comm. Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
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Code
P1601
LAND ROVER
P — Powertrain
Incorrect control module installed
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for LAND ROVER
320
Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
-
LAND ROVER: 2022
-
Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
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- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
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Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
-
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Code
P1601
MAZDA
P — Powertrain
Powertrain Control Module Communication Line To TCM Error
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1601
MITSUBISHI
P — Powertrain
ECM-TVC ECU communication error
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for MITSUBISHI
406
Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MITSUBISHI
-
MITSUBISHI: 2024
-
Outlander
- Black Edition, AWD
- Black Edition, AWD
- Black Edition, FWD
- Black Edition, FWD
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- Platinum Edition
- Platinum Edition
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
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- SEL, AWD
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- SEL, FWD
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Outlander PHEV
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MITSUBISHI: 2023
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Mirage
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Mirage G4
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Outlander
- 40th Anniversary
- 40th Anniversary
- Black Edition, AWD
- Black Edition, AWD
- Black Edition, FWD
- Black Edition, FWD
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- Ralliart
- Ralliart
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Black Edition, AWD
- SEL Black Edition, AWD
- SEL Black Edition, FWD
- SEL Black Edition, FWD
- SE Special Edition, AWD
- SE Special Edition, AWD
- SE Special Edition, FWD
- SE Special Edition, FWD
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Outlander PHEV
-
MITSUBISHI: 2022
-
Eclipse Cross
- ES, AWD
- ES, AWD
- ES, FWD
- ES, FWD
- LE, AWD
- LE, AWD
- LE, FWD
- LE, FWD
- SE, AWD
- SE, AWD
- SE, FWD
- SE, FWD
- SEL, AWD
- SEL, AWD
- SEL, FWD
- SEL, FWD
- SEL Special Edition, AWD
- SEL Special Edition, AWD
- SEL Special Edition, FWD
- SEL Special Edition, FWD
- SE Special Edition, AWD
- SE Special Edition, AWD
- SE Special Edition, FWD
- SE Special Edition, FWD
-
-
MITSUBISHI: 2021
-
MITSUBISHI: 2020
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Code
P1601
OLDSMOBILE
P — Powertrain
Serial Communication Problem With Device 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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👍 Like
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Code
P1601
Other
P — Powertrain
ECM/TCM Serial Communication Error
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1601
PEUGEOT
P — Powertrain
Ignition-on ECU supply control
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1601
PORSCHE
P — Powertrain
Voltage supply
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for PORSCHE
136
Browse 136 PORSCHE manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
PORSCHE
-
PORSCHE: 2021
-
718 Spyder
-
911
- Carrera, 2D Convertible
- Carrera, 2D Coupe
- Carrera 4, 2D Convertible
- Carrera 4, 2D Coupe
- Carrera 4S, 2D Convertible, Automatic DCT Trans
- Carrera 4S, 2D Convertible, Standard Trans
- Carrera 4S, 2D Coupe, Automatic DCT Trans
- Carrera 4S, 2D Coupe, Standard Trans
- Carrera S, 2D Convertible, Automatic DCT Trans
- Carrera S, 2D Convertible, Standard Trans
- Carrera S, 2D Coupe, Automatic DCT Trans
- Carrera S, 2D Coupe, Standard Trans
- Targa 4
- Targa 4S, Automatic DCT Trans
- Targa 4S, Standard Trans
- Targa 4S Heritage Design Ed., Automatic DCT Trans
- Targa 4S Heritage Design Ed., Standard Trans
- Turbo, 2D Convertible
- Turbo, 2D Coupe
- Turbo S, 2D Convertible
- Turbo S, 2D Coupe
-
Cayenne
- Base, 4D Utility Coupe
- Base, 4D Utility Wagon
- E-Hybrid, 4D Utility Coupe
- E-Hybrid, 4D Utility Wagon
- GTS, 4D Utility Coupe
- GTS, 4D Utility Wagon
- S, 4D Utility Coupe
- S, 4D Utility Wagon
- Turbo, 4D Utility Coupe
- Turbo, 4D Utility Wagon
- Turbo S E-Hybrid, 4D Utility Coupe
- Turbo S E-Hybrid, 4D Utility Wagon
-
Macan
-
PORSCHE: 2020
-
718 Spyder
-
Macan
-
Panamera
- 4
- 4 E-Hybrid
- 4 E-Hybrid Executive
- 4 E-Hybrid Sport Turismo
- 4 Executive
- 4 Sport Turismo
- 4S
- 4S Executive
- 4S Executive
- 4S Executive
- 4S Sport Turismo
- 2020 Panamera Base
- GTS
- GTS Sport Turismo
- Turbo
- Turbo Executive
- Turbo S E-Hybrid
- Turbo S E-Hybrid Executive
- Turbo S E-Hybrid Sport Turismo
- Turbo Sport Turismo
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Code
P1601
SAAB
P — Powertrain
Internal Control Module Malfunction
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1601
SATURN
P — Powertrain
Serial Communication Problem With Devise 1
AI status
Completed
Completed
100%
Causes
- Open or short in the cruise control switch wiring
- Faulty cruise control switch or stalk
- Poor connector contact or corrosion at switch/ECU
- Faulty Body Control Module (BCM) / Engine Control Module (ECM) input
- Related input fault (brake or clutch switch triggering cancel)
- Intermittent voltage or ground supply to the switch circuit
Symptoms
- Cruise control disengages immediately or will not engage
- Cruise control indicator may flash or show a warning
- Stored P1601 (manufacturer-specific) code in control module
- Intermittent or permanent loss of cruise function
- No response from cruise set/resume buttons
What to check
- Read fault memory and freeze frame data with OEM-capable scanner
- Clear codes and attempt to reproduce the fault while monitoring
- Visually inspect switch, connectors and wiring at steering column
- Check brake and clutch switch operation and related codes
- Verify power and ground at the cruise switch connector
- Backprobe switch circuit while operating buttons to confirm signal
Signal parameters
- Ignition ON: supply voltage at switch connector ≈ battery voltage (approx. 11–14 V)
- Switch closed: control input to ECU typically goes to battery voltage or ground depending on design (expect either ~0 V or ~battery voltage when activated) — confirm with OEM wiring diagram
- Switch open: open/infinite resistance; closed: low resistance (
- No-load continuity between switch output and module input when activated: near 0 Ω to expected reference
- Intermittent readings or bouncing signals indicate poor contacts or wiring
Diagnostic algorithm
- Connect an OEM-capable scan tool, read and record all stored codes, freeze frame and live data related to cruise, brake/clutch switches and BCM/ECM inputs.
- Clear codes, then attempt to reproduce the fault while monitoring the cruise switch input signal and related inputs live.
- Visually inspect the cruise switch, connectors and harness at the steering column for damage, corrosion or loose pins. Wiggle wiring while watching live data for intermittent changes.
- Verify power and ground at the switch connector with ignition ON. If missing, trace supply/ground back to fuse, relay and module.
- Backprobe the switch output and measure voltage or continuity while operating each cruise button. Compare to expected behavior from manufacturer data.
- Check brake and clutch switch circuits — a faulty cancel input will disable cruise. Confirm proper operation and wiring integrity.
- If wiring and connectors are good, test the input pin at the receiving module for correct signal. If the module does not see the correct signal despite good switch output, suspect module input fault.
- Repair or replace damaged wiring, connectors or switch as found. After repairs, clear codes and confirm cruise operation through full function test and road test.
- If fault persists and wiring/switch are verified good, consult manufacturer service literature for module tests, reprogramming or possible module replacement.
Likely causes
- Worn or broken contacts inside the cruise control switch
- Damaged harness or chafed insulation near steering column
- Corroded connector pins at switch or module
- Faulty brake/clutch switch sending false cancel signal
- Intermittent ground at the steering column or module
- Module input driver fault (internal to ECU/BCM)
Fault status
Status
Cruise control switched off due to detected switch/circuit fault; cruise may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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👎 Dislike
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