Home › Land Rover › 2021 › Defender 90 First Edition › Repair and Diagnosis › General Information › Specifications Index › 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 U2016-47: Control Module Main Software - Watchdog/safety microcontroller failure › Possible Causes