Home >> Land Rover >> 2021 >> Defender 90 >> 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 U2300-54: Central Configuration - Missing calibration >> Possible Causes