Home › Land Rover › 2020 › Discovery Landmark › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Tailgate Control Module (TGCM) -- Discovery/L462 › General Information › Description And Operation › Diagnostic Trouble Code Index - DTC: Tailgate Control Module (TGCM) (G2016126) › DTC U201A-51: Control Module Main Calibration Data - Not programmed › Possible Causes