Home >> Land Rover >> 2021 >> Defender 90 X-Dynamic S >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Cruise Control Module -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Cruise Control Module (G2818898) >> Description And Operation >> Cruise Control Module (CCM) >> DTC U0305-54: Software Incompatibility with Cruise Control Module - Missing calibration >> Possible Causes