Home >> Land Rover >> 2020 >> Defender 110 First Edition >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Transfer Case Control Module (TCCM) (G2400921) >> Description And Operation >> Transfer Case Control Module (TCCM) >> DTC U3006-85: Control Module Input Power "A" - Signal above allowable range >> Possible Causes