Question about 1999 Chevrolet Silverado 1500

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1999 Chevy Silverdo cranks but wont start

Truck died while driving.Then would only run for 30sec or less and die.Suspected the chip in the key put it into security mode.Had a new key made now truck wont start.

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  • Anonymous Mar 17, 2014

    1999 chevy truck starts and dies

  • Anonymous Mar 26, 2014

    WHEN I PUT ON THE BRAKES MY TRUCK DIED AND WONT RESTART

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Ok check your timming belt then your ckt sensor the chip will not let the truck even crank or let the dash come on

Posted on Dec 07, 2008

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Changed ignition switch now security light stays on and truck starts and kills


You need to relearn the passlock system (security). There are 2 ways. One is with a scanner, which most diy'er wont own an expensive one to do it this way, here is the manual way. Start the truck and let it run until it dies. The security light should then be flashing. Leave the key in the run position until the security light stops flashing (about 10-15mins). After the light stops flashing turn the key off. Try to start the truck again. It should do the same thing (run for a few seconds and then die with the security light flashing). Again wait for 10-15 mins for the light to stop flashing and then turn the key off and repeat the process one last time. That's a total of 3 times. Once you finish the process the 3rd time. Let the truck sit for a minute with the key off. It should now be programmed and start and run normally.

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The security, antitheft or lock picture/icon 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 misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired 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.
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You must know the resistance value of the old key to make this work, without that info you can't get a new key cut, the resistor was the chip at the base of the key shank. So you are kinda stuck here, the only thing to do is find out if you can buy the VATS module out of the truck the column came from, you module needs to see a proper key resistance signal a certain resistance which was of course the one you lost. Only had one key to the truck?? wow that was a mistake. I lost a key once but luckily it had no anti theft system and a new lock fixed it, after that I have three keys for each of my 4 cars.

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Security light stays on


So the Security light is on or flashing in your vehicle and you are looking at 1 of 3 things. Either the vehicle won't crank over and start, It cranks but dies in a few seconds, or your vehicle shuts off while driving scaring the **** out of you. You have now experienced GM's worst security system ever created. GM's security, also known as Passlock Passkey or Vats.

There are 3 parts in this system.
1.The CHIPKEY
Normally a black resister chip in key which "communicates" to the lock cylinder. Sometimes is hidden in the plastic part of keys in new models. Same concept, might say PK1 PK2 PK3 PL or something similar to that. The newer ones work on frequency. Same thing tho.
2.The LOCK CYLINDER
Inside there are pins that read the chip in the key or the part that reads the frequency on new models. This then "communicates" to the TDM)
3.The TDM
Theft Deterrant Module-Sometimes called the "computer" or "brain". This is the part that sends the signal (**NOTE**) to your car and allows your car to start or continue running depending on your type of system.
If any of these parts are not communicating properly, your SECURITY light will come on and shut down your vehicle. The idea being, that without the chipped key or FOB key, the vehicle wont start and cant be "hotwired" or stolen. Pretty nice when working, but these systems are flawed and the average life is 6-10 years. Every single aspect of this system is expensive to replace and can only be worked on by "authorized" GM service men with out voiding warrenty. Most garages dont even touch them and if they do,
they will sell you every part they can before "fixing" the problem/
*QUICK FIX TRICKS*
1st trick
Try a spare key that is newer or used less. The pins wear down with use and so do the keys causing the security to fail.

2nd trick
(if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my Buick for more than a year. If its shutting down while running, I'm sorry I have no quick fix...

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1 Answer

Starts buts dies instantly ! how do i reset


You may have damaged the chip inside the key fob. If you are using a new key it won't let you use it without the small chip located in the small part of the key lock assembly on the flip key end. If you have purchased and cut a new key you can take this old module apart remove the chip and put it in new assembly or tape it beside the ignition. The dealer is your only other choice, good luck.

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First Check the Fuel Filter and the Belt Tension. Let me know what you Find.

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