Circuit/System Testing

C0131 3A or C0131 4B 

Verify DTC C0131 3A or CO131 4B is not set.

• If DTC is set, perform the scan tool EBCM special function, Brake Pressure Sensor Calibration. Refer to Brake Pressure Modulator Valve Pressure Sensor Calibration .

C0131 00 or C0131 5A

1. Apply and release brake pedal. Verify brake lamps operate properly.
   • If brake lamps do not operate properly, refer to Symptoms - Lighting .
2. Replace the brake pressure modulator valve assembly.