Engine Speed Sensor (8.3, 9 Liter) or Cam Sensor (15 Liter) is failed
Odd clutch solenoid coil or its wiring shorted to power
Aux 4th remote valve FLOW potentiometer is failed in the Armrest Controller
Evaporator sensor open or shorted to power
Engine Speed Sensor signal is failed (no signal at engine controller pin A17)
Odd 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.