you might need a stronger battery. check the cranking amps and upgrade.
bad starter, or wire to starter
transmission not in park
Does the engine turn over every time you try, or does it sometimes do nothing when you turn the key?
1997 cadillac deville will not turn over
There are sensors all over the engine that can turn the check engine light on.There are sensors all over the engine that can turn the check engine light on.
push in on the light with your finger and give it a quarter turn
No, a rusted flywheel will not cause the engine not to turn over.
Is the fuel pressure ? is there spark at the plugs?
Check for spark at the plugs. Check for fuel to the engine.
The engine will turn over , but either run poorly or not at all
I had the same thing happen to me and my 96' suburban. It turned out to be that the battery was shot and wouldn't hold enough of a charge to turn over the engine. Might be the same thing with you.
need more info . spark , fuel ???