Home › Land Rover › 2021 › Defender 110 › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index: Restraints Control Module (RCM) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Restraints Control Module (RCM) (G2768847) › Description And Operation › Restraints Control Module (RCM) › DTC U201B-57: Control Module Calibration Data #2 - Invalid/Incomplete software component › Possible Causes