C0503 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C0503 – Left Front Wheel Speed Sensor Circuit High

 

C0503 Possible Symptoms

 

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

 

C0503 Possible Causes

 

Faulty Left Front Wheel Speed Sensor,Left Front Wheel Speed Sensor harness is open or shorted,Left Front Wheel Speed Sensor circuit poor electrical connection

 

C0503 Description

 

The Anti-Lock Brake System (ABS) Module monitors the Left Front Wheel Speed Sensor. The ABS Module sets the OBDII code when the Left Front Wheel Speed Sensor is not to factory specifications.