After refueling my 2004 Duramax, it would start and quit within 1 or 2 secs. It was like the fuel pump was off. Tried to start 10 times before it finally started and stayed running. It hasn't done it since (this was 3 days ago). The following day while driving on the highway we stopped for about an hour for lunch and after starting the truck the radio wouldn't function. It had power but wouldn't pick-up stations and the CD player wouldn't work (no codes on radio). Stopped the truck again about an hour later and still no luck with the radio. Finally after getting home, the truck sat off for about 5 minutes. When I pulled it into the garage I had full radio function again and has been OK since. Seems like some type of security system problem.

Any clues or info on this?

if it is the passlock system you will get a flashing security light, and the truck wont start. do you have a remote start?

Didn't pay any attention to the flashing at the time so I didn't notice anything.

No, I do not have a remote starter.