Home › Jaguar › 2012 › XJ Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- XJ/X351 › Diagnostic Trouble Code (DTC) Index DTC: Restraints Control Module (RCM) › Description And Operation › Restraints Control Module (RCM) › DTC U201A-51: Control Module Main Calibration Data - Not programmed › Possible Causes