The code is a dead battery try charging the battery it is possible that the battery is weak and after charge the cell do not hold to what a good battery would see this could be why the code is coming on if so try to cheat the controller by charging the battery but do not let it go to the end of the cycle shut off the charger and plug back into the truck and see if it clears. if so the battery is weak. You could try clearing with the zappi hand set.