Why wont my van start?

You may have a relay problem I just went through that with my Cadillac sounds pretty much the same miss you look up on Google where are your relays located start up your vehicle

Make sure batt terminals are tight or bring it in and have it checked . Similar relays can be swapped to see if they're bad

Possible weak battery. Try a jump.

Does the security light remain on? If so it's a security system problem and you need to be towed to your local GM Dealer for repairs! Hope that helps! Jim