24 Monitoring VDD11/VDD25 voltage - Dosing valve/Pump motor - supply voltage VD11 low - P0658 12 Volt supply for dosing module - Below lower limit
Monitoring VDD11 voltage-Dosing valve - supply voltage high - P0659 12 Volt supply for dosing module -above upper limit
If Steering Not Working,Hydraulic suction filter plugged.Improper tire inflation.Steering linkage needs lubrication.Excessive play in steering. See your John Deere Dealer.