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 DTC C0110 is not set.
- If DTC C0110 is set
  Refer to DTC C0110 .
- Go to next step: If DTC C0110 is not set
Verify that DTC C0115 does not set while driving the vehicle under normal braking conditions.
- If DTC C0115 sets
  Replace the Q5 Brake Pressure Modulator.
- Go to next step: If DTC C0115 does not set
All OK.