Question about 2004 Chevrolet Express

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Why won't 2004 chevy express start when security light is on?

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  • Chevrolet Expert
  • 259 Answers

Because ignition key has a chip that allow ecm to start the engine if you are using a key copy it will not working, if you don't have the original key with the chip on it you must take vehicle to the dealer to disable the security program on engine computer

Posted on Apr 23, 2015

6 Suggested Answers

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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: 2003 chevy express cutaway

Odd, and hard to figure out without hearing
the "scratching". I'd say run over to
the local GM service bay, and ask them to
do some inspecting. It's all covered under
a warranty right now I suspect, so have the
anomolies checked out while you can for free.

Best I can offer without being there to evaluate.

Let me know what they discover.

ALARMTEK
CARALARMMAN.COM

Posted on Jun 25, 2008

  • 10934 Answers

SOURCE: 2004 chevy 3500 express passenger van transmission

if ur replacing it remove front grill disconnect both lines and carefully remove retaining clips from radiator if replacement is original eguipt mount & reconnect --if its a universal follow instructions usually cut off fittings and use clamps and hose to hook up

Posted on Oct 27, 2009

  • 5370 Answers

SOURCE: Ran 99 chevy express hot won't start even with a

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks.

Posted on Mar 03, 2012

tayjoejoe
  • 2182 Answers

SOURCE: security light on 2004 chevrolet express van won't go off

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 May 23, 2012

tayjoejoe
  • 2182 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

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1 Answer

2004 chevy express 3500 first the fuel pump was acting up and all the Gages were going up and down. Now the van won't start/run and the security light is off at all times? Any related problems known?


the common thing is the battery . Check by having a load test done then clean terminals and posts and tighten up. run fault codes with a scanner and reset the CPU .

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How do I change the brake light on a 2004 Chevy Express van?


Just go onto google and type in how do I change a brake light on a Chevy express van you will be shown a video of how to do it hope this helps

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Wiring diagram chevy van


Fixed Problem (it was my van) no power to ignition wire at starter. Replaced Ignition lock cylinder. just worn down. (Delivery van 50-60 starts a day). 160k miles.

Apr 25, 2013 | 2000 Chevrolet Express Cargo

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My 2004 Chevy suburban won't start but there is a locked padlock on dashboard , is this why?


sound like problem in the theft security systm,try this insert another key in the ignition switch, the other key could be worn where pcm and bcm dont recognize it. and switch ignition on engine off watch padlock symbol with ignition switch left on 10 minutes the padlock symbol will extinguish or turn off then you will turn off ignition switch wait 5 seconds then try starting vechicle if start your theft security failing need let dealership check it out.

Aug 27, 2012 | 2004 Chevrolet Suburban

1 Answer

Security light on 2004 chevrolet express van won't go off


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/

May 20, 2012 | 2004 Chevrolet Express

1 Answer

Won't start lights come on but engine won't do anything


There is a good chance that you have a blown fuse or that your starter is gone.

May 16, 2012 | 2004 Chevrolet Express

1 Answer

2004 chevy express box truck stalls when i turn head lights on


check battery as it may be dead or alternator may be going bad. to check alternator, start engine, remove lead from battery. if it dies, then the alternator is no good.

Nov 17, 2011 | 2004 Chevrolet Express

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