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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Antilock Brake System) >> Diagnostic Information and Procedures >> DTC P0856 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  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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