C0900 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C0900 – Control Module Power Circuit Malfunction/High Voltage
C0900 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C0900 Possible Causes
Faulty Control Module Power,Control Module Power harness is open or shorted,Control Module Power circuit poor electrical connection
The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. The Powertrain Control Module (PCM) sets the OBDII code when the Control Module Power is not to factory specifications.