shut truck off for 5 min. came back out turns over wont start etc light is on all the time never saw it flash only code was a p0400 egr code was running fine didn't stutter slow down ran just fine before I turned it off . going to clean throttle body in morning other than that could it be fuel pump and if so would the lightning bolt light be on? any ideas ?????? thanks im sure there is a thread on this somewhere ive looked but nothing about light staying on again thanks