Home › Land Rover › 2016 › Discovery Sport SE › Repair and Diagnosis › Transmission › Transmission Control Systems › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- Discovery Sport/L550 › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) › Description And Operation › DTC P181F-18: Clutch Control System Performance - Circuit current below threshold › Possible Causes