AA UREA Tank level error (CAN message or electrical with real sensor) - Level over CAN: SAE J1939 Erroneous Signal Level sensor connected directly: SRC low - P203A Reagent - tank level sensor - Open circuit
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.