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.