Home › Jaguar › 2016 › XF S, RWD › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XF/X260 › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) › Description And Operation › Transmission Control Module (TCM) › DTC P084F-29: Park/Neutral Switch Output Circuit - Signal invalid › Possible Causes