C0203 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C0203 – Master Cylinder Pressure Sensor

 

C0203 Possible Symptoms

 

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

 

C0203 Possible Causes

 

Faulty Master Cylinder Pressure Sensor,Master Cylinder Pressure Sensor harness is open or shorted,Master Cylinder Pressure Sensor circuit poor electrical connection

 

C0203 Description

 

The Electronic Brake Control Module (EBCM) uses the input from the master cylinder pressure sensor for more accurate braking control during a vehicle stability enhancement system (VSES) event. The master cylinder pressure is directly proportional to the amount of force that is applied to the brake pedal.