P1571 Code? Here’s How to Fix It – Quickly and Easily

P1571 is a manufacturer-specific OBD-II powertrain code. Its exact definition depends entirely on the vehicle application, ranging from traction control communication circuits to active engine mount solenoids.

Because P1571 is not a generic code, the diagnostic path varies significantly. You must verify the exact factory definition for your specific make and model before testing any components.

Key Takeaways

• P1571 is a manufacturer-specific code, meaning its definition changes depending on the vehicle make and model.
• On GM applications, it relates to the traction control desired torque signal circuit between the EBCM and PCM.
• On Audi and VW applications, it indicates an electrical fault in the left active engine mount solenoid circuit.
• Diagnosis requires confirming the exact factory definition and following the manufacturer-specific diagnostic procedure.

P1571 Code Description and Implications

P1571 is a manufacturer-specific diagnostic trouble code. Because the second digit designates it as manufacturer-specific, there is no single universal definition for this code.

Certain GM applications: P1571 indicates a fault in the Traction Control Desired Torque signal circuit. The Electronic Brake Control Module sends a pulse-width modulated signal to the PCM to request engine torque reduction during wheel slip.

Some Audi and Volkswagen applications: P1571 points to an electrical fault in the left active engine mount solenoid valve circuit, which manages engine vibration dampening.

Because the monitored systems vary drastically, assuming P1571 is always a brake switch or throttle issue will lead to incorrect diagnostics.

Common Causes of the P1571 Code

• On GM applications: Damaged wiring between the EBCM and PCM, a faulty Electronic Brake Control Module, or a PCM communication fault.
• On Audi/VW applications: A failed left active engine mount solenoid, damaged wiring to the mount, or corroded connectors.
• General causes across applications include damaged wiring harnesses, corroded connectors, or poor grounds.

Symptoms Associated With P1571

• Illuminated Check Engine Light or traction control warning indicator.
• On GM applications: The traction control system may become disabled, preventing torque reduction during wheel slip.
• On Audi/VW applications: Increased engine vibration at idle or low speeds due to the active engine mount failing to adjust.

Diagnosing the P1571 Trouble Code

Diagnosing P1571 requires first confirming the exact factory definition for your specific make, model, and engine.

Use a scan tool to retrieve the exact error code and its manufacturer-specific description. Do not rely on generic code readers, as they may display an incorrect or generalized definition.

Once the exact system is identified, follow the manufacturer-specific diagnostic procedure. For GM applications, check the PWM signal circuit between the EBCM and PCM for opens or shorts. For VAG applications, test the solenoid resistance and wiring at the left engine mount.

Repairing the P1571 Issue

Repairs must follow confirmed electrical testing based on the exact vehicle application.

If the code relates to a GM traction control circuit and wiring damage is found, repair the harness. If the EBCM or PCM fails module communication tests, follow the manufacturer procedure for module replacement and programming.

If the code points to an Audi/VW active engine mount solenoid, replace the faulty left engine mount assembly if the internal solenoid is confirmed open or shorted.

Cost Considerations for P1571 Repairs

Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.

Replacing an active engine mount on Audi or VW models requires supporting the engine and removing the mount, which increases labor costs. Module replacement on GM vehicles may require specialized programming.

Prevention Strategies for Future Occurrences

Inspecting exposed wiring harnesses near the engine mounts or ABS module can help identify developing damage or chafing before it causes a circuit fault.

Ensuring electrical connectors are fully seated and their environmental seals are intact may reduce moisture intrusion that leads to corrosion.

Troubleshooting Tips and Best Practices

Do not automatically replace the brake pedal switch or throttle body when a P1571 code appears on your dashboard. On most applications, this code has nothing to do with those components.

Always verify the exact definition using a manufacturer-specific scan tool or service information.

Check for technical service bulletins (TSBs) related to the specific component flagged by P1571 for your exact vehicle, as manufacturers frequently issue updated parts or software recalibrations for these systems.

More OBD-II Codes

Frequently Asked Questions

Is P1571 a generic or manufacturer-specific code?

No. P1571 is a manufacturer-specific code. Its exact definition depends entirely on the vehicle make, model, and engine configuration.

Can a bad brake switch cause a P1571 code?

It depends on the application. While generic brake switch codes exist, P1571 on GM vehicles monitors the traction control torque request circuit, not the standard brake light switch.

Will disconnecting the battery clear a P1571 code?

Disconnecting the battery may temporarily clear the code, but it does not repair the underlying circuit fault. The code will return if the root cause remains uncorrected.

Does P1571 mean my engine mount is broken?

On Audi and VW applications, P1571 indicates an electrical fault in the active engine mount solenoid circuit. This typically requires replacing the active engine mount assembly.

Is it safe to drive with a P1571 code?

Driving is conditionally safe. On GM vehicles, the traction control system may be disabled. On VAG vehicles, you may experience increased engine vibration at idle.

What Should You Do About the P1571 Code?

Confirm the exact factory definition for your specific vehicle application. Because P1571 is manufacturer-specific, a thorough evaluation of the relevant system and components identified by your specific make and model is required.

Inspect the relevant wiring, connectors, and modules or solenoids for confirmed faults. Repair or replace the confirmed failed components, then retest the system to verify the repair.