Home › Land Rover › 2015 › Range Rover Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Driver/Passenger Door Module (DDM/PDM) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Driver / Passenger Door Module (DDM / PDM) › Description And Operation › DTC B12D4-51: Rolling Code Synchronization - Not Programmed › Possible Causes