Question about 2000 GMC Sierra

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Hi i have 12/01 Gmc sierra security light is on and truck will not start

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It sounds like a theft deterrent circuit has been activated.. Check your security device handbook on how to reset it.

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

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SOURCE: Replace starter on 1992 GMC Sierra pickup truck

First thing unhook positive battery cable, unhook main cable on starter selanoid and small wire on selanoid (there may be 2 small wires) There may be a bracket on front of starter that has to be removed, and then the 2 main bolts that hold it to engine block and it should come out.

Posted on Feb 14, 2009

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SOURCE: 94 GMC truck diesel starts,runs and then dies and will not start

I have the same problem and have trouble codes 35 and 36. I found out that there is a computer module that needs replaced as it sits low in a valley and gets hot and seperates. I am reseaching about the a/m fix that installs the new module away from heat.

Posted on Mar 12, 2009

  • 59 Answers

SOURCE: 1997 GMC Sierra Ignition Switch Replacement

take off the cover on the top and bottom of the steering column just behind the wheel. pop the tilt lever out simply just by grabbing it and give it a good tug. then once you have the new switch and you get in there your going to need an inverted torx socket to remove the small bolts that hold the switch to the column. do not move the gear on the new switch make sure it lines up exactly as the old one did!!!!!!!!!!!!

Posted on Mar 15, 2009

GM Elec
  • 1000 Answers

SOURCE: 99 GMC Sierra Pickup: Crank but no start. starts

The theft light issue is a good observation. Have you replaced the key tumbler or an ignition component lately? Has there been a lightning storm close very recently?

What the flashing security light is indicating is an attempt to relearn the key you are using.
Turn the key to run position, allow light to flash for 10 minutes, when light stops flashing turn ignition to OFF position for 5 seconds, turn ignition to run position and start over. Do this for 3 consecutive cycles, the the theft system will relearn the key cylinder code and store it once again.
Try that first before you go any further.
Let me know what you find.
Regards,

Posted on Apr 30, 2009

cshubart
  • 146 Answers

SOURCE: My Power window on my 2003 GMC Sierra 1500 Truck

if your main switch panel still works the passenger window and if door locks still work probaly bad window motor

Posted on Oct 21, 2009

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If you have another key I would try it first.

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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). 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 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. Remember too, the TDM controls the security light. Sometimes you can have ALL the symptoms and no lights.
This link may help you.
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It sounds like the system is in Long Tamper Mode. You can usually reset the system by turning the key to the "ON" position and let the vehicle rest until the light goes out. This should take about 10 minutes.

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Security system failure. Insertion of key fails to put the security light off. Vehicle will start normally and run for a second then stops on a 2000 GMC Sierra 1500.


Seems like you know the problem, this link should provide a solution. http://vatspasslockpasskeysecurityhelp.yolasite.com/

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Haul the truck to the dealer ship and programe the key, you or some one else tryed to start the truck with some other key. Security is ON.

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