Engine-Codes - Hummer - P0856 HUMMER

P0856 HUMMER - Traction Control Torque Request Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0856 HUMMER Possible Causes

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

How is the P0856 HUMMER code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0856 HUMMER code

Labor: 1.0

The cost to diagnose the P0856 HUMMER code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • ABS Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

P0856 HUMMER Meaning

When traction control is active, the Electronic Brake Control Module (EBCM). sends a serial data message to the Engine Control Module (ECM) requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.

More Information

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