Home › Land Rover › 2015 › Range Rover Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) › Description And Operation › DTC U2023-51: Control Module Network Signal Calibration Data - Not programmed › Possible Causes