Home >> Land Rover >> 2020 >> Defender 110 First Edition >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Rear Differential Control Module (RDCM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Rear Differential Control Module (RDCM) (G2400909) >> Description And Operation >> Rear Differential Control Module (RDCM) >> DTC U3000-4B: Control Module - Over temperature >> Possible Causes