I have no problems starting the truck when the engine is cold. When the engine warms up, it will not start. Changed the EGR valve, checked the EGR cooling lines, they are clear. Scanned truck with no codes. Does anyone have a solution?

 

Almost guarantee it is the FICM, fuel injector computer module, had the same thing happen and replaced it about $900 Canadian part

 

If there are no codes, there are a few things to check, and almost all require a scanner that will read the datastream.
Usually (but not always), low FICM power will set a codes; as will a loss of sync of the CMP and CKP sensors; this feels like a low high pressure oil concern.
Choose a few parameters, like ICP, IPR, FICM power, Battery voltage, and sync. The ICP should easily go above 500 psi after a few seconds of cranking. If not, there is a HP oil leak of something somewhere. IPR should be about 15% (or higher), FICM power should be above 48Volts, and sync should say yes. If there is a leak, then the oil pressure (hot) will probably not quite reach 500 psi.
If it doesn't then the best place to start is with how the engine ran when cold. Was there a misfire (either hot or cold?). If this is a HP oil leak, then you'll have to isolate it, and a tech that's worked on these would most likely be required, unless you have the adaptor that fits into the oil rails to do pressure tests.