Circuit/System Verification
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Diagnose all other brake light DTCs or Symptoms prior to performing this diagnostic procedure.
- Verify that DTC C0277 or C0278 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, observe the scan tool EBCM BPP parameter while applying and releasing the brake pedal. The reading should change between Applied and Released.
- If the parameter does not change between applied and release, replace the EBCM.
- Replace the brake pressure modulator valve assembly.