Home › Jaguar › 2012 › XJ Base › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code (DTC) Index DTC: Gateway Module -- XJ/X351 › DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Gateway Module › Description And Operation › Gateway Module (GWM) › U0300-46 Internal Control Module Software Incompatibility - Calibration/parameter memory failure › Possible Causes