Home › Land Rover › 2017 › Discovery SE › Repair and Diagnosis › Transmission › Transmission Control Systems › 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 U3006-13: Control Module Input Power "A" - Circuit open › Possible Causes