2002 alero turns over wont stay started sudden problem

Call GM dealer service and they should be able to give you an idea over the phone. Describe the EXACT problem to them.
This could be a bad keyswitch or a key gone bad. Could be bad switch down on steering coumn which keyswitch actuates. Hard to say. don-ohio

try leaving the key on for 10-15 minutes, or however long it takes for the security light to go off. If this works it sounds like you will need to have the exciter ring on the ignition lock cylinder changed.

Ck the alienator my not be charging.

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/

sounds like you have a bad alternator this would cause loss of power

well if you security light is on, then you have to put your key in the on position for exactly 10 mins and wait until the light blinks and then turns of and then you turn the key off and they you can start it. i have a 2002 alero and it works for my car.

I happen to own a 2002 alero, and my wife called me and said the same problem had happened. Change your fuel filter.

My girlfriend had the same problem, so we took it to the local dealer in Costa Mesa, CA and were told she needed a new engine to the tune of 5K. We decided to take it to our local mechanic and he discovered that the “ignition control box”, which apparently has the antitheft controls too and shuts the flow of gas to the engine because it thinks its being stolen when it malfunctions, was causing the starting problem. Once, the box was replaced it worked fine. Because the IBC controls antitheft, it will need to be “reprogrammed” be someone that has access to the proper equipment or the dealer. I think the whole thing was about $800 - $900. Sure beats $5,000

Hope this helps,
B

Hi, I just read somewhere on the WWW that the crank sensor and or fuse can be a issue. I too have a 2002 Alero.. Worst car I have ever owned!

if you have a test light you can check your coil you have power by turning the ignition on test light should be light on