2000 Grand Am -Service Engine Soon light

Hi, my service engine soon light came on, turns out my son didn't put the gas cap back on properly...what do I need to do to reset/clear out the light? Thanx!

you will need a scanner tool to clear the code usualy, then it may just go off on its own. Just takes it a while to update sometimes.
You can go to a parts store too, they can usually scan it and clear them for you for free.

And Welcome to AF!