AutoCodes – Generic – P0856

P0856 Code - Traction Control Torque Request Circuit Malfunction

Quick Answer

The Electronic Brake Control Module (EBCM) and the Engine Control Module (ECM) simultaneously control the traction control. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module Harness is open or shorted, Electronic Brake Control Module Circuit poor electrical connection. 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 indicates Traction Control Torque Request Circuit Malfunction.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module Harness is open or shorted, Electronic Brake Control Module Circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 39,828

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0856 Description

The Electronic Brake Control Module (EBCM) and the Engine Control Module (ECM) simultaneously control the traction control. The electronic brake control module sends a serial data message to the engine control module requesting torque reduction. When certain engine control module Diagnostic Trouble Codes (DTC) are set, the engine control module will not be able to perform the torque reduction for traction control. A serial data message is sent to the electronic brake control module indicating that traction control is not allowed.
The DTC will be set when the engine control module diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the electronic brake control module indicating that torque reduction is not allowed.

OBDII Code P0856 - Traction Control Torque Request Circuit Malfunction - AutoCodes.com — P0856 Code - Traction Control Torque Request Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0856?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module Harness is open or shorted
Electronic Brake Control Module Circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0856?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0856 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0856 code?

Need more information on how to fix the P0856 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0856 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0856 Buick — Traction Control Torque Request Circuit Malfunction
P0856 Cadillac — Traction Control Torque Request Circuit Malfunction
P0856 Chevrolet — Traction Control Torque Request Circuit Malfunction
P0856 Dodge — Traction Control Torque Request Circuit Malfunctional
P0856 GMC — Traction Control Torque Request Circuit Malfunction
P0856 Hummer — Traction Control Torque Request Circuit Malfunction
P0856 Pontiac — Traction Control Torque Request Circuit Malfunction

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.