If your key has a chip in it..try replacing the key first,if that does niot help,you will most likely be replacing the ignition cylinder,i have done this on MANY gm products,its a common failure
If you've checked the starter and it's good, you probably need an ignition switch. The ignition switch is a little plastic box located under the dash. It is hooked onto or near the steering column.
I just replaced one of these on my grandsons van. I had never heard of one until i started troubleshooting his van. It was simple to replace. Just two little bolts/screws.
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Sounds like a bad battery connection or it is about time to replace the starter...good luck...
SOURCE: no ignition
DOES THE ENGINE TURN OVER(CRANK)? IF IT CRANKS BUT NO START THE TWO WHITE WIRES FROM THE IGNITION CYLINDER IN THE STEERING COLLUMN ARE PROBABLY BROKEN AND WILL NOT SEND THE RESISTANCE FROM THE KEY TO THE SECURITY MODULE. IF THIS IS THE PROBLEM YOU NEED TO CHENGE THE IGNITION LOCK CYLINDER OR INSTALL A RESISTOR UNDER THE DASH THAT IS THE SAME RESISTANCE AS THE KEY ON THOSE TWO WHITE WIRES. SORRY BUT SOUNDS LIKE YOU NEED A MECHANIC/TECH WITH KNOWLEDGE OF THIS PROBLEM TO HELP YOU.
SOURCE: Turn key, nothing happens
It could be the park/neutral switch, next time it doesn't start try wiggling the shifter in park while turning the key, or shift to neutral and see if that will work. if that doesn't change the problem I would replace the ignition switch.
SOURCE: my 2002 Alero wont start
Since you've tried the 10 minute relearn process with no luck, Try this same process 3 x in a row without trying to start in between. Will take a little over a half hour. If this still does not work, and the security light is solid (not flashing) this indicates a bad TDM. (passlock security computer)(Theft Deterrent Module). A new one will cost about 700 bucks. But this entire system is able to be bypassed permanently. If all else fails, check out this link. Its full of info on how the system works, along with "do it yourself" ways to fix it. http://vatspasslockpasskeysecurityhelp.yolasite.com/
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