Home >> Land Rover >> 2017 >> Discovery Sport SE >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Discovery Sport/L550 >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) >> Description And Operation >> DTC U0100-87: Lost Communication With ECM/PCM "A" - Missing message >> Possible Causes