B1D00 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1D00 – Headlamp Left Low Beam


B1D00 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1D00 Possible Causes


Faulty Headlamp Left Low Beam,Headlamp Left Low Beam harness is open or shorted,Headlamp Left Low Beam circuit poor electrical connection,Faulty Body Control Module (BCM)


B1D00 Description


When the Body Control Module (BCM) receives a message that the headlamp switch is in the HEADLAMPS ON position and the multifunction switch is in the LOW BEAM position (or the autolamps feature has requested the headlamps on), the BCM provides voltage through the headlamp output circuits to the Left (LH) and Right (RH) low beam headlamps. The BCM also provides an overload protection of the low beam output circuits. When an excessive current draw is detected, the BCM disables the affected low beam circuit driver. This Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground from the LH low beam output circuit.