Home >> Land Rover >> 2019 >> Range Rover Autobiography >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Range Rover/L405 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G2016296) >> DTC P084F-29 Park/Neutral Switch Output Circuit - Signal invalid >> Possible Causes