Need owners manual to see how to fix a problem with the security system. The key has a chip and somehow it won't start the car Mechanic thinks it is in the security system related to the chip in the key - we don't have an owners manual to see how to turn it off or bypass it.

A mechanic would check for power at the starter, the neutral safety switch, and the key switch. If the security light in the cluster is on, you could have a problem with the chip in the key or the sensor in the lock cylinder.

On GM cars that won't crank, you need to make sure the security system is not faulty. The passkey system reads a chip in your key.
If the security light is not on, a mechanic would check for voltage at the starter, the neutral safety switch, and the key switch.

I can understand you being frustrated.
There really is no way to tell if the fuel pump was the problem at this point.
If the security system fails, you should see "security" light up on the cluster.
The key lock has a sensor that reads the chip in the key. If the sensor fails or the chip fails the computer won't let the vehicle start.
Most of the time when the security system is at fault, the vehicle won't start, but it won't cause the engine to stall.
You might want to have someone check the fuel pressure and spark at the plugs if you don't see the security light on the cluster.
Could be the fuel pump relay and a list of other things.
I would probably check the computer for trouble codes too.

The security 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) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.



http://vatspasslockpasskeysecurityhelp.yolasite.com/

Hello! The vehicle is equipped with the GM Pass-Key System..Also called VATS system....It works so well that 1000's of owners can not start their cars..It can only be bypassed with a commercial kit sold on Amazon.com (example). First I need to know a little background...Is this a problem with the owner using a new key; Or key is fine and it just quit working? The key has a resistor in it...It has been called a "chip" for so long that the name stuck...See the photo below and tell me if this is what the keys look like...#1...Clean the chip with contact cleaner...#2 Spray contact cleaner into the key slot...There are two contacts inside the key slot...If this does not work then the Theft Module is defective...At the PCM C-2 Pin# 44 is a Yellow wire...Cut the wire (leave enough slack to re-connect if needed) and Alligator clip it to ground...NOT THE END GOING INTO THE PCM but the cut end looking away from the PCM...See if the car will start...Send a comment...Guru...Saailer






I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

The normal key of your car has a chip in it, without that chip the security system is activated and the motor shut down - the blinking light is to signal that. The previous owner has put that key there as to use a regular/simple key, much cheaper than a chipped key . Put the taped key back where you have found it and it will all go back to normal.

If the security light is on, then it can only be one thing. The security system is failing and immobilizing your car. Go to this link and read up on the problem. The security light is a dead give away that the security is messed up. If you have no little black chip in the shaft of your key, then this means you must have a passlock that runs on the transponder. You need the PERMANENT fix from this site. http://vatspasslockpasskeysecurityhelp.yolasite.com/

The security 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) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.



http://vatspasslockpasskeysecurityhelp.yolasite.com/

I finally found someone who knew what to do. Apparently the VATS lost its memory of what is the right value that it then compares to the value that is read on the ignition key resistor chip. Not knowing what to compare it to, it goes into security mode and will not enable starting. So the VATS module has to be reprogrammed or it has to re-learn the value that it needs to have. Sometimes when you disconnect the battery, that is why the VATS loses its memory. The trick is this: you can sometimes help the VATS to re-learn the value by turning the key to an 'on' position, waiting ten minutes, then turning the key off. You do this THREE TIMES. That will take you a half hour. What car theif would be that patient, right? Then on the forth time you turn it all the way to start and it should go. If that doesn't work, you have to take it to a dealer who can download a program and re-program the VATS. But if you are luckey, you can do it yourself this way. You would think that they would tell you this in the owner's manuel, wouldn't you? If this helps someone else, let me know. I played hell learning the lesson.

the new key has to be programmed, is it a chip key? I don't think ACe has chip key for GM passkey security systems like what comes standard on your car.

go to this web site the keys are $21.50 each plus shipping or u can get one from the GM dealer.