Home › Jaguar › 2010 › XJ L › Repair and Diagnosis › Transmission › Transmission Control Systems › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XJ/X351 › Diagnostic Trouble Code (DTC) Index DTC: Transmission Control Module (TCM) › Description And Operation › Transmission Control Module (TCM) › DTC U2101-56: Control Module Configuration Incompatible - Invalid/incomplete configuration › Possible Causes