Home › Land Rover › 2021 › Defender 90 S › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Interactive Display Module A (IDMA) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Interactive Display Module A (IDMA) (G2308466) › Description And Operation › Interactive Display Module A (IDMA) › DTC U0055-88: Vehicle Communication Bus D - Bus Off › Possible Causes