Home >> Land Rover >> 2021 >> Defender 110 SE >> Repair and Diagnosis (Single Page) >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Gateway Module (GWM) -- Defender/L663 >> Diagnostic Trouble Code Index: Gateway Module (GWM) (G2801686) >> Description And Operation >> Gateway Module (GWM) >> DTC B1479-48: Power Supply Distribution Box - Supervision Software Failure >> Possible Causes