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Security system shuts down engine - 1995 Buick LeSabre

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The security system (VATS/Passkey) installed on these GM cars is anti-owner more than an anti-theft. There are 3 parts involved:

  1. The chip-key
  2. The lock cylinder
  3. The TDM (aka the brain of the system)
if any of these parts fails or is even slightly malfunctioning, the car stays stuck where you are and you only get a dealer asking you about 1,000$ to fix it. And all the 3 parts have a quite short lifespan. Way too many people got in this situation (including myself). I don't recommend any partial solution or any used parts as it would happen again way too soon to be acceptable and if it happens 100 miles from home (like it happened to me....) it's a big burden. I finally made it to save my beloved 94 Park Avenue (with the exact same system that is installed in your car) with a solution that I found on the internet and that bypasses the entire factory security system, all 3 pieces altogether and you can even remove the TDM at the end and use 99c keys without chip. The product I used is at and is still working perfectly after 5 years. Don't go to the dealer!

Posted on Feb 28, 2011


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Security anti theift disarm 1997 pontiac transport

You most definitely CAN. You have the picture on the dash when this happens that says SECURITY or a picture of a car with a lock through it. This 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, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well.


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Car turns off locks me in horn and doors lock system shuts down

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Oct 29, 2015 | Cars & Trucks

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My 2006 Nissan Titan with an 5.6L engine suddenly shuts down while driving down the road. It does not sputter out the engine just shuts down all of a sudden while driving just like it would if you tur

There could be a problem with the security system or the main computer could have a burnt spot or a crack in the board. Had an issue a few years back with a Dodge Dakota will run fine when a computer got hot it would shut down. I would take it and have it put on a scanner to see if there is any codes then go from there

Jan 16, 2015 | 2006 Nissan Titan

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Why did my security light come on when my 1999 Chevy cavalier overheated? Now it won't start unless I crank it over and over again

Security light came on and shut engine down to protect engine from overheat and damage motor. Have coolant system burped. (Have all air expelled in coolant system and this should solve your problem) There is obviously air in system not allowing coolant to flow freely, which would cause rapid temp. rise and shut engine down. Hope this helps.

Nov 12, 2013 | Cars & Trucks

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My ford escape 2008-the antitheft system keeps flashing,but the engine is starting.. What can I do?


Aug 24, 2011 | Ford Escape Cars & Trucks

1 Answer

Passlock dont starter

The Passlock system is notorious for failing. There are 3 different parts of this system that can shut down the car and activate the Antitheft security system. The problem will be one of these 3 things. The key. the ignition lock cylinder, or the TDM. The easiest one is the key. The key will either have a small black chip in the key shaft or a transponder hidden in the key head. If there is a chip, they are known for wearing down and not reading correctly. Try wiggling it, cleaning the chip with alcohol, and taking all other keys off the key chain because it pulls on the key and causes problems. If you have no chip and instead a transponded key, (it will have a little "+" sign by the plastic) you can try performing a relearn procedure. It goes like this.

1. Perform a security system relearn.
2. Let the vehicle sit for more than 10 minutes with the key off.
3. Attempt to start the engine, leave the key in the run position monitoring the security system indicator.
4. After 10 minutes, the security indicator will change state.
5. Turn the key off and wait 10 seconds.
6. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
7. After the second 10 minute timer has expired, turn the key off for 10 seconds.
8. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
9. After the 3rd 10 minute timer has expired, shut the key off for 10 seconds.
10. The security system will relearn on the 4th starting attempt and the engine should start and run.
If that doesnt work, you will need to start replacing parts. Like i said, there are 3 parts. The key, the ignition lock cylinder, and the Theft Deterrent Module (TDM). all of these are involved in the Passlock system and could be responsible for shutting down the vehicle. And trust me they are all expensive. I always share this link for this problem because there is so much information on there and will be helpful no matter what you decide to do. If all else fails, there is PERMANENT FIX for this problem. You can bypass all aspects of the system and never worry again. That is also on this link.


Aug 19, 2011 | 1997 Oldsmobile Achieva

1 Answer

Car starts up for a seacond and shuts off and the security light flashes

Sound like a SECURITY SYSTEM is armed; I suggest check in the Owners Manual to disarm...


When the PASS-Key III system senses that someone is using the wrong key, it shuts down the vehicle's starter and fuel systems. The starter will not work and fuel will stop being delivered to the engine. Anyone using a trial-and-error method to start the vehicle will be discouraged because of the high number of electrical key codes.

When trying to start the vehicle if the engine does not start and the SECURITY light comes on, the key may have a damaged transponder. Turn the ignition off and try again.

If the engine still does not start, and the key appears to be undamaged, try another ignition key. At this time, you may also want to check the fuse. If the engine still does not start with the other key, your vehicle needs service. If your vehicle does start, the first key may be faulty.

Hope this helps.

Jun 10, 2011 | 2002 Pontiac Grand Prix

1 Answer

Engine starts, but shuts off like the fuel pump is out, good fuel pressure. security light on dash on. ideas?

yes some times a security system will allow car to start and get as far as 5-10 feet and shut down as if out of fuel but the security system acts like it is being stolen. if it is a factory install then call dealer and see if you can overide it with a sequence of procedures.

Jan 16, 2011 | 1993 Jeep Grand Cherokee

1 Answer

Security system shut down car.ignition was replaced a year ago,light came back on 2 months battery went dead and car wont restart.

The security system will not shut down the car while running, if the car shut off while engine was running you may have another problem. Do you have a "chip" or black pellet in your key, if so the wires going to the key cylinder may be broken at the cylinder or the key may be worn if you are having a security problem

May 23, 2010 | 1996 Oldsmobile Achieva

1 Answer

Notstarting because sercurity system shutdown

You need to either replace the ignition lock cylinder or bypass the security system. If you need help with either one, repost.

Mar 09, 2009 | 1995 Chevrolet Monte Carlo

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