Home >> Land Rover >> 2021 >> Defender 110 SE >> 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 P188A-98: Differential Oil Temperature Too High/Too Low - Component or system over temperature >> Possible Causes