I have a 2001 Chevy Duramax 2500 4x4 that is stuck in 3rd gear and will not shift out. The codes read P0700-Trans. Control System Malfunct., P0847-Trans. Fluid Sensor Switch B Ckt. Low, P1711- Trans. Pressure Switch E stuck closed, P1713- Trans. Pressure Switch Rev. Ckt. Malfunct., P1781-Engine Torque Signal Ckt.