Home >> Jaguar >> 2017 >> XJR Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XJ/X351 >> Diagnostic Trouble Code (DTC) 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