One day I was setting waiting to meet someone with my truck running it run for the whole time with the air on. So when I took off driving I made it about 150 foot and it shut off. So I cranked it a pretty good bunch and i didn't start so I let it set for about 15 minutes and it started back and run fine all the way home. checked the codes and it come up with a cam sensor code and low FICM voltage. SO i replaced them both and checked the IPR valve to make sure the screen was good and it was good so drove it for 2 weeks. So then again just a couple of days ago I stopped and got something to eat and let the truck run for about 15 minutes and I thought this is the same thing I done before I beat it will quit again So i pulled out on the road and made it about 100 foot and it quit. tried to restart it and it wouldn't waited about 5 minutes it restarted and when I got ready to give it fuel and it quit again. Waited about 5 more minutes and it started and run fine all the way home I even let it run to try to get it to do it again and it wouldn't. so I checked the codes again and it gave another FICM low voltage code and this time a crank sensor code. I really like this truck and love working on diesels. This problem has thrown me for a loop any help would be greatly appreciated.
rhubbard2000
Since you replaced the physical items; cam sensor and FICM check the wire harness to them items. Also if the truck is warm/hot and dies and wont start till it cools off. It COULD be a sign of a high pressure oil system leak. It was very common for the ficm harness to rub through on a couple of spots on some 6.0Ls and cause issues so I would check the wire(s) to the ficm and cam sensor before dropping anymore parts at it.
Aside from what was mentioned, another thing you can look at is changing your IPR. I had a similar issue where my truck would shut down when hot; then restart after it cooled down. Found a thread on 7.3 IPR valves creating too much resistance as they aged which led to the solenoid not working properly. I can say that it also holds true for the 6.0 from personal experience. My local dealer wanted $320+ for a new IPR. I went ahead and got one from rockauto.com for about $170 OEM Motorcraft. The IPR shouldn't have anything to do with your CPS and FICM low voltage though. Good luck man!
Thanks guys I appreciate your help. I figured out what the problem was and it was not something I would have ever thought it would be. I pulled and pushed on every wire under the hood and couldn't get it to quit so I tap the top of the fuse box and it quit it was the main power supply cable in the back of the fuse box loose. Again thanks guys. Hopefully this might help some of those guys with a no start issue it is easy to check and might be a lot peoples no start problems.
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