B123F Code: Meaning, Causes, and Symptoms | OBD2 Codes

B123F – Automatic Lighting Control Unit/Sensor Internal Error


B123F Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B123F Possible Causes


Faulty Sunlight Sensor,Sunlight Sensor harness is open or shorted,Sunlight Sensor circuit poor electrical connection,Faulty Climate Control Unit


B123F Description


The Climate Control Unit monitors the Automatic Lighting Control Unit/Sensor. The Climate Control Unit sets the OBDII code when the Automatic Lighting Control Unit/Sensor is not to factory specifications.