pull the battery and check the specific grav on all cells
as edward said, make sure all fuses are ok

the code 10 has to do with being locked on to a wire (wire guidance) but detecting a fault while locked on

if you are not using wire guidance then make sure the switch on the console is turned off and that function should be disabled in the TMM.

with the code 10 active the truck will not run at full speed

there is a chance you may have an issue with the electronics in the steering or wire guidance control which would require more extensive troubleshooting (with the proper literature on hand)