Circuit/System Verification

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.

Ignition ON.
Verify that no other DTCs are set except for C0242.
- If any other DTCs are set
  Refer to the Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If no other DTCs are set
Replace the K20 Engine Control Module.
Verify that DTC C0242 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
All OK.