Home >> Land Rover >> 2021 >> Defender 110 X >> 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 C0591-28: Brake Booster Motor "A" Phase U-V-W Current Low - Signal bias level out of range/zero adjustment failure >> Possible Causes