Circuit/System Testing
- Verify that DTC C0131 4B is not present.
- If DTC C0131 4B is present, perform the Brake Pressure Modulator Valve Pressure Sensor Calibration .
- Observe the stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.
- If the stop lamps do not operate properly, refer to Symptoms - Lighting .
- Replace the brake pressure modulator valve assembly and verify the DTC does not reset.
- If the DTC resets replace the K17 Electronic Brake Control Module (EBCM).