Home › Land Rover › 2015 › Range Rover Base › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code Index DTC: Telematics Control Module (TCU) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Telematics Control Module (TCU) › Description And Operation › DTC U201A-51: Control Module Main Calibration Data - Not programmed › Possible Causes