Home › Land Rover › 2021 › Defender 110 X › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Gateway Module (GWM) -- Defender/L663 › Diagnostic Trouble Code Index: Gateway Module (GWM) (G2801686) › Description And Operation › Gateway Module (GWM) › DTC U0300-46: Internal Control Module Software Incompatibility - Calibration/parameter memory failure › Possible Causes