Home › Jaguar › 2015 › XK 2D Convertible › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XK/X150 › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) › Description And Operation › Transmission Control Module [TCM] › DTC P084F-01: Park/Neutral Switch Input Circuit - General Electrical Failure › Possible Causes