Circuit/System Verification

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On / Vehicle - In Service Mode
Verify there are no other DTCs set, except for DTC P158A.
- If any other DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no other DTCs are set
NOTE:
During the programming procedure, follow the Service Programming System (SPS) prompts for the correct ignition switch position.
Reprogram ECU » » K9 Body Control Module & K20 Engine Control Module
Operate the vehicle within the Conditions for Running the DTC. - Verify the DTC does not set.
- Go to next step: If the DTC is not set
All OK.