Home >> Land Rover >> 2017 >> Discovery SE >> Repair and Diagnosis >> Transmission >> Transfer Case >> Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) -- Discovery/L462 >> Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) >> Description And Operation >> DTC U1A4B-84: Control Module Processor B - Signal below allowable range >> Possible Causes