What system does it use? If it's EV100, those codes mean:
01- seat switch not closed (nobody on it)
03- reverse direction selected when the key is switched on
06- accelerator is pushed with no direction selected
11- start switch is closed when the key switch is closed

So the codes probably mean nothing. But if you know he ran over debris, it wouldn't hurt to unplug the battery and look under the truck, using a mirror if need be. You might find wires or cables damaged.