Home › Land Rover › 2021 › Defender 110 › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Transmission Control Module (TCM) (G3187879) › Description And Operation › Transmission Control Module (TCM) - 8HP70/45 Transmissions › DTC P164C-62: Internal Control Module Start-Stop Performance - Signal compare failure › Possible Causes