Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) >> Description And Operation >> DTC U101A-86: Lost Communication With TCM - Multiple Bus - Signal invalid >> Possible Causes