Circuit/System Testing

WARNING: This page is about a different car, the 2020 GMC Acadia. 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.