Home >> Land Rover >> 2021 >> Discovery R-Dynamic HSE >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Rear Differential Control Module (RDCM) -- Discovery/L462 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Rear Differential Control Module (RDCM) (G2016121) >> DTC P186A-13: Differential Lock-up Actuator Brake Control Circuit/Open - Circuit open >> Possible Causes