Home › Jaguar › 2012 › XK 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 U3000-54: Control Module - Missing Calibration › Possible Causes