Home >> Land Rover >> 2015 >> Range Rover Autobiography >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Suspension Control Module (CHCM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Suspension Control Module (CHCM) >> Description And Operation >> DTC U201A-54: Control Module Main Calibration Data - Missing calibration >> Possible Causes