Circuit/System Verification

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.

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.