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.
Apply and release brake pedal. Verify the brake stop lamps operate properly.
- If the brake stop lamps do not operate properly
  Refer to Symptoms - Lighting .
- Go to next step: If the brake stop lamps operate properly
Verify that DTC C0131 is not set.
- If the DTC is set
  Replace K17 Electronic Brake Control Module.
- Go to next step: If the DTC is not set
All OK.