How do I get my anti-theft security lockout cleared on my 2001 Grand Prix.

The system only activates like this if there is a defect in the systems operation, you must have the security system scanned to see what is causing the unwanted activation. This is a dealer level repair.

Yes it does have a chip, and yes you'll be buying the expensive key or bypassing the system. http://www.diy-gm-security.com/

You can physically Hot wire it, but the theft system will stop you from driving it. You can read/learn about a bypass system here. http://www.diy-gm-security.com/

Having the vehicle checked for DTC'S - diagnostic trouble code's an doing diagnostic's for the code is the proper way to diagnose , not guessing . No you cant reset it or disengage it ,need factory or professional scanner .

You might have interupted the signal from the ignition to the Theft Deterrent Module when you changed the ignition.. It may be a loose wire or something worse. Read about it on this link.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

This link shows a couple ways to bypass the anti theft security system on your car

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Might possibly be. Pontiacs were really tied into that anti theft security system. They were notorious for breaking. Here is a link to a site about these SECURITY systems. And possible DO IT YOURSELF solutions. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Anti theft security has kicked in. Refer to your manual for resetting or remove the battery posts for 10-15 mins and see if it clears.Please let me know if this helps

First see if you key have the anti theft pellet,or wile starting the car is the security light is flashing.you're anti theft may be active and prevent you're engine from start by cutting off the injector pulse

Try shifting into neutral, insert the key, start the car; then: press the brake to the floor and, shift into park.