Home >> Jaguar >> 2014 >> XF Base >> Repair and Diagnosis (Single Page) >> General Information >> DTC Index >> Diagnostic Trouble Code: Central Junction Box (CJB) -- XF/X250 >> Diagnostic Trouble Code (DTC) Index DTC: Central Junction Box (CJB) >> Description And Operation >> DTC B12A6-15: Auxiliary Heater Water Pump - Circuit short to battery or open >> Possible Causes