Code
P1664
ALFA ROMEO
P — Powertrain
Throttle angle repeat signal above maximum value
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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
P1664
BUICK
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1664
CADILLAC
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P1664
CHEVROLET
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for CHEVROLET
356
Browse 356 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
CHEVROLET
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CHEVROLET: 2020
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Camaro
- LS, Automatic Trans
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- LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans
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- 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
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- LT1, 2D Convertible, Standard Trans
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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
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- 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
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- 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
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- 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
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Corvette
-
Express 2500
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- 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
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- 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
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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
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- 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
- LTZ, 6.6L Eng VIN 7, 4WD
- LTZ, 6.6L Eng VIN 7, 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 Pickup, 6.6L Eng VIN 7, 4WD
- WT, 2D Pickup, 6.6L Eng VIN 7, RWD
- 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 Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
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Code
P1664
FIAT
P — Powertrain
Throttle angle repeat signal above maximum value
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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
P1664
GM
P — Powertrain
1 4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1664
GMC
P — Powertrain
1 4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1664
HUMMER
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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.
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HUMMER: 2008
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HUMMER: 2007
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HUMMER: 2004
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HUMMER: 1993
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Code
P1664
LAND ROVER
P — Powertrain
Malfunction of the fuel injection pump
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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
- 110 SE
- 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
- 110 XS Edition
-
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
P1664
OLDSMOBILE
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P1664
SAAB
P — Powertrain
Shift Up Output Signal From Control Module Malfunction
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
Code
P1664
SATURN
P — Powertrain
1-4 Upshift Lamp Control Circuit
AI status
Completed
Completed
100%
Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor
- Open/short in TPS/pedal sensor wiring (short to battery/5V reference)
- Damaged or corroded connector or pins at throttle body or pedal module
- Failed throttle body assembly (integrated sensor/electronics)
- Faulty 5 V reference or ground to the sensor from the ECU
- Intermittent ECU fault or internal electronics failure
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Reduced engine power / limp-home mode
- Poor or unresponsive accelerator pedal
- Surging or erratic idle
- Possible inability to start or sudden loss of throttle control
What to check
- Read stored freeze-frame and live data with a diagnostic scanner
- Confirm P1664 is current or historic and record any related codes (P012x, P022x, P2135, P210x, etc.)
- Visually inspect throttle body and accelerator pedal connectors for corrosion, bent pins or water ingress
- Backprobe throttle angle/position sensor signal wires and measure voltage with key ON / engine OFF
- Check 5 V reference and ground at the sensor connector
- Wiggle test wiring harness while monitoring live signal for intermittent changes
Signal parameters
- Typical TPS/pedal sensor voltage: ~0.4–1.0 V at closed/throttle idle to ~4.0–4.6 V at wide open
- Redundant/second sensor often provides an inverse or separate scaled signal (check OEM spec)
- 5 V reference supply from ECU should be steady (≈5.0 V) with key ON
- Sensor ground should be low resistance to chassis/ECU ground (≈0 Ω)
- Fault condition if signal exceeds ~4.8–5.2 V or is above manufacturer maximum threshold
Diagnostic algorithm
- Connect a capable scan tool, confirm P1664 and note any related DTCs and freeze-frame data.
- View live data: observe throttle angle / pedal position sensors at key ON and during pedal movement. Note abnormal/high readings.
- With key ON (engine OFF) backprobe sensor signal wire(s). Measure DC voltage at closed throttle and while moving the throttle/pedal. Compare to expected range.
- Measure the 5 V reference at the sensor connector with key ON. Verify it is present and stable. Check sensor ground continuity to ECU ground.
- Inspect and repair any damaged connectors, pins, and wiring. Pay attention to signs of short to battery (voltage present on signal when it should be low).
- Perform wiggle test on wiring harness while monitoring live signal for intermittent faults.
- If wiring and connector are good, remove and bench-test or replace the throttle body (or pedal module) per OEM procedure.
- If replacement does not clear the issue, test or replace ECU only after confirming harness and sensors are correct and checking for TSBs/recalls.
Likely causes
- Corroded/damaged connector or wiring causing a short to battery
- Failed throttle position sensor inside throttle body
- Shorted 5 V reference or sensor return/ground
Fault status
Status
Throttle angle repeat signal above maximum value — redundant throttle/position feedback is reporting a voltage higher than the allowed maximum. Check throttle/pedal sensors, wiring, and 5 V reference/ground.
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?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email