Home >> Land Rover >> 2013 >> Range Rover Sport HSE >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Range Rover Sport/L320 >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) >> Description And Operation >> DTC U0138-63: Lost Communication with All Terrain Control Module - Circuit/component protection time-out >> Possible Causes