Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Verify that no DTCs are present in the ECM.
- If any DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no DTCs are set
Replace the K19 Suspension Control Module and verify the DTC does not reset.
- If the DTC sets
  Replace the K20 Engine Control Module.
- Go to next step: If the DTC does not set
All OK.