Home › Land Rover › 2013 › LR2 Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Rear Differential Control Module (RDCM) -- LR2/L359 › Diagnostic Trouble Code Index DTC: Rear Differential Control Module (RDCM) › Description And Operation › DTC P0634-68: Control Module Internal Temperature "A" Too High - Event Information › Possible Causes