Engine Position Sensor (8.3, 9 Liter) or Crankshaft Sensor (15 Liter) is failed
Mid range clutch solenoid coil or its wiring shorted to power
Temperature select pot open/shorted to power
Engine Position Sensor signal is failed (no signal at engine controller pin A9)
Mid range clutch solenoid coil or its wiring shorted to power
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.