Home › Land Rover › 2021 › Defender 90 First Edition › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Cruise Control Module -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Cruise Control Module (G2818898) › Description And Operation › Cruise Control Module (CCM) › DTC U0046-88: Vehicle Communication Bus C - Bus off › Possible Causes