Home >> Land Rover >> 2021 >> Defender 110 S >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Tow Bar Control Module (TBM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Tow Bar Control Module (TBM) (G2400887) >> Description And Operation >> Tow Bar Control Module (TBM) >> DTC U0037-87: Vehicle Communication Bus B - Missing message >> Possible Causes