C2303 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C2303 – Short In Power Source Relay Circuit
C2303 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C2303 Possible Causes
Faulty Transmission Control ECU Assembly,Transmission Control ECU harness is open or shorted,Transmission Control ECU circuit poor electrical connection
The integration relay is activated by output voltage from the Transmission Control ECU and supplies power to the shift control actuator (parking lock motor). The Transmission Control ECU outputs this Diagnostic Trouble Code (DTC) when it detects a malfunction in the integration relay.