Question about 2004 GMC Envoy

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I have a problem to start my 2004 envoy the security lligth comes on

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  • sightsear Dec 02, 2014

    Hi sergio torres, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

  • sightsear Dec 03, 2014

    Have a used 96 buick (that I really like) with a key fob that can do WAY more than I can remember the steps. start.OR start every 2hrs or whatever I pick, and run for 15 min, or however long I pick. If started need the key in ignition or will quit if put in gear, and MAY EVEN quit with key in ignition. NOW, it has taken me 45 minutes to figure out how to allow me to get back to normal. Entails stuff sorta like, hold brake, turn key on/off three times within 5 seconds, turn lights on twice say four bad words etc..anyway you get the picture. Has your fob and security system been entertaining themselves lately?? Check out the how both work, will need a booklet from security Mfg. how it works with fob. probably can find info online. Sounds to me like your Envoy is stuck in security mode. Bet a friendly dealer could talk you through stuff to see if that's the issue. Good Luck.

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Early GM models have ridges/valleys in the ignition key, and one of them tells the ECM that it is the correct key. It is possible either the key or the ignition lock pins are worn out. You have not indicated if you have tried using a different key.

Posted on Nov 29, 2014

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A class 2 scan tool can diagnose the problem so it can be fixed. in some cases if you disconnect the battery for a few minutes it will reset the security system. I do not own an Envoy so I can't be certain of a complete reset but the scanner will work. Many auto parts store will check the problem for you.

Posted on Nov 29, 2014

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2004 gmc envoy xlt wont start security light on


Diagnostic Starting Point - Theft Deterrent
Begin the system diagnosis with the Diagnostic System Check - Theft Deterrent . The Diagnostic System Check will provide the following information:
• The identification of the control module(s) which command the system.
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I had a bad cell in the battery. Replaced the battery and all worked fine.

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