P0856 HUMMER – Traction Control Torque Request Circuit Malfunction

P0856 HUMMER Possible Symptoms

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

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)

P0856 HUMMER Description

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.