2007 Duramax 1 ton van at the shop not starting. Started fine every day until yesterday. The battery charger is on it now, getting ready to trace down the issue. Common sense tells me to start with the starter, but ive also been told GM has a reflash for the ECM on these..... can anyone elaborate on a similar issue with these?

 

Did it fire then die? How many miles are on your last fuel filter change? Did you try re priming the pump? Did you fill up somewhere you normally dont? Is it really cold like it is here in WI lol