Home >> Land Rover >> 2015 >> LR4 HSE, AWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- LR4/L319 >> 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