Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) >> Description And Operation >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module - Missing message >> Possible Causes