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Home / DTC / P1571 — TCS PWM Circuit No Frequency

P1571 — TCS PWM Circuit No Frequency

Detailed page for trouble code P1571.

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Code

P1571

BUICK P — Powertrain

TCS PWM Circuit No Frequency

Brand: BUICK
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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Code

P1571

CADILLAC P — Powertrain

TCS PWM Circuit No Frequency

Brand: CADILLAC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
180

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Code

P1571

CHEVROLET P — Powertrain

TCS PWM Circuit No Frequency

Brand: CHEVROLET
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
456

Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

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Code

P1571

CHRYSLER P — Powertrain

TCS PWM Circuit No Frequency

Brand: CHRYSLER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1571

GM P — Powertrain

TCS PWM Circuit No Frequency

Brand: GM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1571

GMC P — Powertrain

TCS PWM Circuit No Frequency

Brand: GMC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1571

HUMMER P — Powertrain

Traction Control Torque Request Circuit

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1571

JAGUAR P — Powertrain

Brake Switch

Brand: JAGUAR
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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Code

P1571

LAND ROVER P — Powertrain

Brake switch failure

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P1571

MINI P — Powertrain

Engine control module (ECM), sensor supply circuit A - high output

Brand: MINI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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Code

P1571

MITSUBISHI P — Powertrain

Stop lamp switch

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P1571

OLDSMOBILE P — Powertrain

TCS PWM Circuit No Frequency

Brand: OLDSMOBILE
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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Keep it short and practical. Up to 500 characters.
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Code

P1571

Other P — Powertrain

Brake Switch Malfunction

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P1571

PORSCHE P — Powertrain

Immobilizer

Brand: PORSCHE
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
136

Browse 136 PORSCHE manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

PORSCHE

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Code

P1571

SATURN P — Powertrain

TCS PWM Circuit No Frequency

Brand: SATURN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
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Code

P1571

VOLKSWAGEN P — Powertrain

Left Engine Mount Solenoid Valve Short To B+

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or intermittent wiring in the TCS PWM output circuit
  • Short to battery or short to ground on the PWM lead
  • Corroded or loose connector(s) at the TCS/ABS/EBCM module or at the actuator
  • Failed TCS/ABS/EBCM module or internal driver (power transistor/MOSFET)
  • Blown fuse or faulty relay supplying module
  • Water intrusion or contamination in connectors or harness

Symptoms

  • Traction control / StabiliTrak warning lamp illuminated
  • Traction control disabled message and loss of traction control function
  • Possible ABS light on if module shares circuits
  • Reduced driveability if system reduces engine torque
  • Stored DTC P1571 (TCS PWM Circuit No Frequency) in module memory

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Inspect module connectors, wiring harness and related fuses/relays for corrosion, damage or loose terminals
  • Visually inspect harness routing for chafing, water ingress or pinched sections
  • Check vehicle battery voltage and charging system for proper voltage (approx. 12.4–14.7 V)
  • Use a scan tool to command TCS/Aux outputs (if available) while observing live data

Signal parameters

  • Expected PWM frequency: manufacturer-specific — commonly in the 20–500 Hz range (check service data)
  • Expected PWM duty cycle: varies with commanded torque reduction (0–100%)
  • Idle/high-level voltages: when commanded off ~0 V or open-circuit; supply for driver typically battery voltage (approx. 12 V)
  • Ground reference: module ground should be near 0 V with battery negative connection

Diagnostic algorithm

  1. Retrieve and record all DTCs, freeze-frame and live data with a factory-level or capable scan tool. Note related ABS/TCS codes.
  2. Perform a visual inspection of connectors, wiring and fuses related to the TCS/ABS/EBCM. Repair obvious damage and clear corrosion.
  3. Verify battery voltage and ground quality. Clean and tighten battery terminals and module grounds as needed.
  4. Locate wiring diagram for the vehicle and identify the TCS PWM output pin(s), their supply and ground circuits.
  5. Backprobe the PWM output at the module connector with the ignition on and TCS inactive to confirm resting voltage. Then command the system (road test or use scanner to activate output) while monitoring for a PWM frequency.
  6. Use an oscilloscope to verify presence, frequency and duty cycle of the PWM waveform at the module output and at the actuator/solenoid. If waveform present at module but absent at actuator, suspect wiring/connector between them.
  7. If no waveform at the module output, check fuses/relays and power/ground to the module. Perform resistance checks of power and ground circuits per service manual.
  8. Perform continuity/resistance checks of the PWM conductor between module and actuator with connectors disconnected. Repair any opens or shorts.
  9. If wiring and connector resistance and continuity are good but no PWM at the module output, consider module internal driver fault. Before replacing module, confirm by substituting a known-good module or by professional module bench test per factory procedures.
  10. After repairs, clear codes and perform a road test or functional test to verify the TCS operates normally and that P1571 does not return. Document repairs and retest.

Likely causes

  • Damaged wiring harness to TCS modulator/actuator
  • Corroded connector pins at module or actuator
  • Failed module output stage (driver)
  • Blown fuse or poor power/ground to the module

Fault status

⚠️ Status
TCS PWM Circuit — No frequency detected. Traction control disabled. Check wiring, connectors, power/ground and module output driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P1570 P1572 P0620 P0627 P0562 P0563
626

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