Home › Jaguar › 2014 › XF Base › Repair and Diagnosis › Engine Performance › Engine Control Systems › Diagnostic Trouble Code Index DTC: Engine Control Module (ECM) GTDI 2.0L Petrol -- XF/X250 › Diagnostic Trouble Code (DTC) Index DTC: GTDI 2.0L Petrol DTC: Engine Control Module (ECM) › Description And Operation › U0404-41: Invalid Data Received from Gear Shift Control Module A - General checksum failure › Possible Causes