Home › Land Rover › 2021 › Defender 90 › 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 U3000-04: Control Module - System internal failures › Possible Causes