Home >> Jaguar >> 2012 >> XJ Base >> Repair and Diagnosis (Single Page) >> Electrical >> Fuses & Circuit Breakers >> 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 U201B-54: Control Module Calibration Data #2 - Missing calibration >> Possible Causes