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Hello I have a 2006 f350 with the 6.0 i was driving today and everything was going fine I've never had a problem with the truck but today it just shut off and now won't start can you give me any kind of where to look at I'm lost on why it did that
The list is long of what it could be, without knowing what happened when it 'shut off' (any unusual noises like tapping/banging/clanking) and some basic diagnosis. I suggest you head over to the 6.0 forum for more responses, but I would suggest checking basic things first.
Check to make sure there's no coolant or fuel in the oil. Likewise check for oil in the coolant.
When you pull the dipstick, wipe it on a white paper towel and look for any shiny metal flakes.
Is the motor turning over when you try to start it?
Check voltage, check fuel pressure, make sure there's no obstruction in the intake.
If you can't do any of that kind of diagnosis, you're going to want to open your wallet and hopefully it's kinda deep - diesel mechanics are getting expensive as 6.0s age.
If it suddenly died as though you shut the ignition off but you sill have dash lights, gauges, etc., start by checking all of the fuses with a multimeter on beep-for-continuity setting or an actual fuse tester.