Home >> Land Rover >> 2021 >> Discovery R-Dynamic HSE >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Body Control Module (BCM) -- Discovery/L462 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Body Control Module (BCM) (G2165406) >> DTC B124B-86: Left Daytime Running Light - Signal invalid >> Possible Causes