Truck will not drive when turned into left lock, there is no effort from the right hand drive motor at all even when going straight.

The steer pot is fine.

I cannot get the battery off to check the motor as there is no other truck on site to remove battery.

The truck only shows -51 at key on, once the truck is operating no code is showing.

Truck is coming back to workshop next week, can someone assist in what code 51 means so I can get it back on the road?

Thanks