Home >> Jaguar >> 2018 >> XJR575 >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> General Information - Diagnostic Trouble Code (DTC) Index (SASM - VDCM) -- XJ/X351 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G2721998) >> DTC P0850-29: Park/Neutral Switch Input Circuit - Signal invalid >> Possible Causes