Home >> Land Rover >> 2021 >> Defender 110 X-Dynamic SE >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) For 8HP76/51 Transmission -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) For 8HP76/51 Transmission (G2413630) >> Description And Operation >> Transmission Control Module (TCM) - 8HP76/51 Transmission >> DTC P0955-29: Auto Shift Manual Mode Circuit - Signal invalid >> Possible Causes