C0109 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C0109 – Power Supply Voltage Failure

 

C0109 Possible Symptoms

 

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

 

C0109 Possible Causes

 

Faulty Anti-Lock Brake System (ABS) Module,Anti-Lock Brake System (ABS) Module harness is open or shorted,Anti-Lock Brake System (ABS) Module circuit poor electrical connection

 

C0109 Description

 

The Anti-Lock Brake System (ABS) Module monitors the Power Supply Voltage. The ABS Module sets the OBDII code when the Power Supply Voltage is not to factory specifications.