Home >> Land Rover >> 2022 >> Range Rover Sport Autobiography Dynamic >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Range Rover Sport/L494 >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G3187878) >> Description And Operation >> Transmission Control Module (TCM) >> DTC P0955-29: Auto Shift Manual Mode Circuit - Signal invalid >> Possible Causes