Home >> Land Rover >> 2020 >> Defender 110 First Edition >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Anti-Lock Brake System Control Module (Abs) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Anti-Lock Brake System Control Module (Abs) (G3134779) >> Description And Operation >> Anti-Lock Brake System Control Module (Abs) >> DTC U0100-87: Lost Communication With ECM/PCM "A" - Missing message >> Possible Causes