B163A Code: Meaning, Causes, and Symptoms | OBD2 Codes

B163A – Front Left Turn Lamp Control Circuit Short

 

B163A Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B163A Possible Causes

 

Blown Front Left Park and Turn Signal Bulb,Faulty Front Left Turn Lamp,Front Left Turn Lamp harness is open or shorted,Front Left Turn Lamp circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B163A Description

 

The Body Control Module (BCM) receives a communication network message from the Steering Column Control Module (SCCM) requesting turn signal lamp illumination. When this bus message is received, the BCM provides a pulsed voltage output through the front turn signal control circuit. The front turn signal control circuit connects to the dual filament Park and Turn Signal Lamp. The same ground circuit is used for both the Park and Turn Signal filaments in a dual filament lamp.