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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. 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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