Home › Jaguar › 2014 › XK Base, 2D Convertible › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Headlamp Control Module A (HCM) -- XK/X150 › Diagnostic Trouble Code Index DTC: Headlamp Control Module A (HCM) › Description And Operation › Headlamp Control Module [HCM] › DTC U3000-49: Control Module - Internal electronic failure › Possible Causes