Home >> Jaguar >> 2017 >> XF S, RWD >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) - LWB -- XF/X260 >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) - LWB >> Description And Operation >> Automatic Temperature Control Module (ATCM) >> DTC B12A6-13: Auxiliary Heater Water Pump - Circuit open >> Possible Causes