thats an AC truck right?
i had one a month ago do the same thing

its the accelerator pot

the pot has an arm with an oblong slot in it

the the pedal has a pin coming out of the left face to the left to engage the slot in the pot arm

make sure the pin from the pedal is in the slot not on the outside of the lever (the pot is spring loaded internally so it will move with the pedal even if its not in the correct spot)

this pin looked like it was driven in too far (apprentice day at the yale factory lol) and the pin jumped out of the slot and made the machine pop code 07

make sure that pin is flush on the right hand side of the pedal

if that looks good adjust the pot

if you do indeed find that this is the issue
then dont touch the pot
remove the pedal and drive the pin into its correct spot
(protruding to the left and flush to the right side of the pedal)

install the pedal and make sure that pin engages the slot
and that you set up the actuator tab for the start switch right
(its a lil trickier than it looks, lining up the tab + slot takes some finagling, i missed it twice 3rd time was a charm lol)

i also fount that it kinda chewed up the end of the pin a bit when it jumped out of its slot
if yours looks kinda messy just clean up the end of the pin with a file (the exposed end not the end in the pedal)

if you need a picture of it (from the manual) then click my screenname that brings up my profile and there you shall find my email lol