C1749 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1749 – Trailer Input Circuit Failure


C1749 Possible Symptoms


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


C1749 Possible Causes


Faulty Trailer Input Switch,Trailer Input Switch harness is open or shorted,Trailer Input Switch circuit poor electrical connection


C1749 Description


The Anti-Lock Brake System (ABS) Module monitors the Trailer Input Switch. The ABS Module sets the OBDII code when the Trailer Input Switch is not to factory specifications.