Home >> Jaguar >> 2017 >> XJR Base >> Repair and Diagnosis (Single Page) >> General Information >> DTC Index >> Diagnostic Trouble Code: Central Junction Box (CJB) -- XJ/X351 >> Diagnostic Trouble Code (DTC) Index DTC: Central Junction Box (CJB) >> Description And Operation >> Central Junction Box (CJB) >> DTC U201A-51: Control Module Main Calibration Data - Not programmed >> Possible Causes