Home › Jaguar › 2015 › XKR 2D Convertible › Repair and Diagnosis › Transmission › Transmission Control Systems › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XK/X150 › Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) › Description And Operation › Transmission Control Module [TCM] › DTC P0781-77: 2-1 Shift - Commanded position not reachable › Possible Causes