Question about 2002 Chevrolet Chevrolet Tahoe

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Security light flashes red then yellow. Truck turns over but will not start.

No dome lights

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  • Chevrolet Master
  • 260 Answers

It sounds to me like your security system is failing. I have had this happen before .. Its really common in the gm cars.. check this out..read it over this is what I did to fix mine and its been 5 years and I haven't had any issue since.. they guarantee it also.. hope this helps Do It Yourself GM Security bypass

Posted on Apr 01, 2015

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Posted on Jan 02, 2017

tayjoejoe
  • 2184 Answers

SOURCE: 1999 2dr chevy tahoe security light flashes truck won't start

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/

Posted on Jun 26, 2012

swc6912
  • 62 Answers

SOURCE: security light flashes yellow then red. Please Help!

Here is the fix.
You may need another car with jumper cables or a backup battery, because the car may need to be "on" for up to 45 minutes.

Turn the key on (don't try to start) will be 10-15 minutes and red light will stop.
I believe the light / indicator is rotating through different symbols.
so when the security stop showing you have 1 minute (60 seconds) to turn the key off and back on again.
Do not try to start.
You may have to do this up to three times (not more).
When you turn the key on and the security light does not come on you can start the car.

Posted on Apr 01, 2015

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Security light flashes yellow then red. Please Help!


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1999 2dr chevy tahoe security light flashes truck won't start


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/

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