Home › Jaguar › 2018 › XF Sportbrake First Edition › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) -- XF/X260 › Diagnostic Trouble Code Index DTC: Telematic Control Module (TCU) › Description And Operation › Telematics Control Module (TCU) › DTC U201A-54: Control Module Main Calibration Data - Missing calibration › Possible Causes