B12A9 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B12A9 – Recirc Door Actuator Drive Circuit Shorted to Battery Voltage


B12A9 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B12A9 Possible Causes


Stuck or damaged linkage or door,Faulty Air Inlet Door Actuator,Air Inlet Door Actuator harness is open or shorted,Air Inlet Door Actuator circuit poor electrical connection,Electronic Manual Temperature Control (EMTC) Module,Electronic Automatic Temperature Control (EATC) Module


B12A9 Description


Under normal operation, the air inlet door actuator motors are supplied voltage or ground on the circuit, depending on desired actuator rotation, by the Electronic Manual Temperature Control (EMTC) Module or Electronic Automatic Temperature Control (EATC) Module. The EMTC module or EATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on. The module sets the OBDII code when the Air Inlet Door Actuator is not to factory specifications.