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P0856 2017 GMC Sierra Code - Traction Control Torque Request Circuit Malfunction

Quick Answer

The P0856 diagnostic trouble code (DTC) in a 2017 GMC Sierra indicates a malfunction in the traction control torque request circuit. Common causes include Damaged or corroded wiring in the traction control torque request circuit, Faulty traction control module, Malfunctioning engine control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0856 2017 GMC Sierra indicates Traction Control Torque Request Circuit Malfunction.
Common causes
Common causes include Damaged or corroded wiring in the traction control torque request circuit, Faulty traction control module, Malfunctioning engine control module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0856 2017 GMC Sierra Description

The P0856 diagnostic trouble code (DTC) in a 2017 GMC Sierra indicates a malfunction in the traction control torque request circuit. The traction control system in modern vehicles is designed to help maintain stability and control during acceleration by managing wheel spin. When this code appears, it signifies that there is a problem with the communication between the traction control module and the engine control module. This can lead to issues with how torque is distributed to the wheels, potentially compromising the vehicle's handling and performance.

OBDII Code P0856 2017 GMC Sierra - Traction Control Torque Request Circuit Malfunction
P0856 2017 GMC Sierra Code - Traction Control Torque Request Circuit Malfunction

Common Causes of P0856 2017 GMC Sierra

  1. Damaged or corroded wiring in the traction control torque request circuit
  2. Faulty traction control module
  3. Malfunctioning engine control module
  4. Issues with the wheel speed sensor
  5. Electrical faults or short circuits in the system

Symptoms of P0856 2017 GMC Sierra

  1. Illuminated traction control warning light on the dashboard
  2. Reduced traction control functionality, especially in slippery conditions
  3. Erratic acceleration or loss of power during driving
  4. Unusual noises or vibrations coming from the drivetrain
  5. Difficulty maintaining stability while driving at high speeds or around corners

How to Fix P0856 2017 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the traction control torque request circuit, looking for any signs of damage or corrosion in the wiring and connectors.
  2. Test the traction control module and engine control module for proper functionality using a diagnostic scan tool to pinpoint any faults.
  3. Check the wheel speed sensor for proper operation and replace if necessary.
  4. Clear the DTC codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, consider seeking professional help from a certified mechanic or dealership for further diagnostics and repairs.

Cost to Fix P0856 2017 GMC Sierra

The typical repair costs for addressing a P0856 code in a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the parts required for the repair, such as a new traction control module or wheel speed sensor, can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair bill potentially exceeding $500 depending on the extent of the repairs needed. It is advisable to consult with local auto repair shops for accurate cost estimates based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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