Home >> Land Rover >> 2020 >> Defender 110 First Edition >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Rear HVAC Control Module (RHVAC) - With Rear Air Conditioning -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Rear HVAC Control Module (RHVAC) - With Rear Air Conditioning (G2400910) >> Description And Operation >> Rear HVAC Control Module (RHVAC) - With Auxiliary Climate Control >> DTC U201A-57: Control Module Main Calibration Data - Invalid/incomplete software component >> Possible Causes