B1809 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1809 – Lamp Tail Output Circuit Short To Ground
B1809 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1809 Possible Causes
Faulty Lamp Tail,Lamp Tail harness is open or shorted,Lamp Tail circuit poor electrical connection,Faulty Body Control Module (BCM)
The Body Control Module (BCM) monitors the Lamp Tail. The BCM sets the OBDII code when the Lamp Tail is not to factory specifications.