P115A stuck on road
So last night a friend of mine was stopped on the side of the road. He shut off his truck. 2006 6.0/auto/4x4. Its got an Edge A2 in it if that helps at all. He tried starting his truck back up and it would just turn over....but not start up. The Edge A2 pulled the code P115A....which is saying low fuel level/forced limited power. He told me the only thing that he could think of is he ran dangerously low the other day on the interstate to the point where it was sluggish as he pulled in to fill it up. After he filled it up, he's run for maybe 4 days and its been fine. So the most we did last night was change the fuel filters which, the lower one was the only dirty one.....still wouldn't crank. This morning he got some batteries for it which needed replacing anyways....It cranked right up. (btw, before i got there last night i told him to pull the cables off the batteries...thinking perhaps it'd reset the computer...didnt work) Now, he ran it for a bit this morning and cleared the codes....Shut it off...now it wont start again....
What is going on? need help ASAP.