Question about 1999 Pontiac Sunfire

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Why the theft system light is on and the car wont start

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The key is not being recognized by the anti theft immobilizer. Take to dealer to have problem solved and to maybe have the keys coded to the computer.

Posted on Aug 03, 2010

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Posted on Jan 02, 2017

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Dec 26, 2015 | Cars & Trucks

1 Answer

Theft system light comes car wont start


The theft light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hot wired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Oct 22, 2013 | Cadillac Eldorado Cars & Trucks

1 Answer

Theft light is on & car wont start


theft system is locking down the computer on your exoedition

Dec 31, 2011 | 2007 Ford Expedition Eddie Bauer EL

2 Answers

Hi I own A 98 Chevy Malibu, my ignition locked n i had to put a new ignition switch in, well now my cars tellin me Something Theft Service. Im wonder what I need to do? Iv unhooked battery for hours ect...


You need to reset the theft system. To do this, try to start it. It should start and die. Then after it dies and the theft light is flashing, leave the key on for 10 minutes. After 10 min, the theft light should go out. After the theft light goes out, turn off the key. Count to 5, then restart it. Then it should work.

Nov 07, 2010 | 1998 Chevrolet Malibu

2 Answers

My theft light is flashing but my 1997 expedition wont start.The vehicle turns over but just don't start.


ANTI-THEFT SYSTEM Passive anti-theft system
Your ignition key has a unique imbedded transponder which engages engine electronics and allows the vehicle to be started. Without the use of your special ignition key, the vehicle will not start.

During each vehicle start, the coded key is read by the anti-theft system. If the key’s ID code matches the code in the anti-theft system, the vehicle is enabled to start.

Anti-theft system
Briefly illuminates when the ignition is turned to the ON position to verify that the passive anti-theft system is operating properly.

Also, its possisble that tou have actovated the fuel pump switch.

CHeck it.

Jul 20, 2010 | 1998 Ford Expedition

2 Answers

How to reset factory anti theft system dodge intrepid


how to reset the anti theft system for my 2006 dodge ram 1500

Oct 19, 2009 | Cars & Trucks

1 Answer

1998 ford expedition wont start. theft like is


If you are reseting a factory alarm...lock and unlock the drivers door with the key. If you don't know the code look under the dash driver side in left corner there should be a black cover with a sticker with a code on it 6 numbers that is the factory code.

Oct 07, 2009 | 1998 Ford Expedition

2 Answers

99 chevy cavalier theft system light on steady, car wont crank.


My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!

Jul 20, 2009 | Chevrolet Monte Carlo Cars & Trucks

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