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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Antilock Brake System) >> Diagnostic Information And Procedures >> DTC P0856: Traction Control Torque Request Circuit >> Circuit/System Testing

Circuit/System Testing

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  1. Verify that no other DTCs are set except for P0856.
    • Go to next step: If only DTC P0856 is set 
  2. Replace the K20 Engine Control Module.
  3. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
    • If DTC sets 

      Replace the K17 Electronic Brake Control Module.

    • Go to next step: If DTC does not set 
  4. All OK.
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