Home >> Land Rover >> 2021 >> Discovery R-Dynamic HSE >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Adaptive Speed Control Module (ASCM) -- Discovery/L462 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Adaptive Speed Control Module (ASCM) (G2011724) >> DTC C0078-61: Tire Diameter - Signal calculation failure >> Possible Causes