C12B4 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C12B4 – ABS Master Cylinder Pressure Sensor Performance
C12B4 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C12B4 Possible Causes
Faulty Brake Pressure Modulator,Brake Pressure Modulator harness is open or shorted,Brake Pressure Modulator circuit poor electrical connection
The Electronic Brake Control Module (EBCM) uses input from the master cylinder pressure sensor for more accurate control during a vehicle stability enhancement system event. The master cylinder pressure sensor is internal to the brake pressure modulator.