Home › Jaguar › 2018 › XE S, RWD › Repair and Diagnosis (Single Page) › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Body Control Module (BCM) › Diagnostic Trouble Code Index DTC: Body Control Module (BCM) › Description And Operation › Body Control Module (BCM) › B123A-04 Left Front Turn Indicator - System internal failures › Possible Causes