Question about 2003 GMC Envoy

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After I replaced my battery,my tach goes crazy and it will not idle if I have the a/c on.Is there any way I can reset my computer without taking it in to the shop as I don't have the cash at the time. Thanks for any help It is a 2003 Envoy with a v6

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  • Jimmy Wilkins Sep 11, 2010

    When my Envoy idles down so low with the a/c on,I can take the battery loose for a few minutes,and put them back on and my tach returns to normal.Sometimes I can turn the a/c on and it will do just fine,but it doesn't last,and sooner or later the tach will slowly move up to about 7000 rpm's.The Dealer said they would have to reprogram the computer.

  • Jimmy Wilkins Sep 12, 2010

    Tried what you said.Sometimes after I crank it up it will idle like it suppose to,then again it will start trying to idle down too far and probably go dead.And after a while the tach will,every time
    I start off and the rpm's go up,it just keeps going each time until it gets all the way over.Any
    thing else I can try.I had reset it before I came in the house and it was doing alright then.Will
    se next time I go off.Thanks for sticking with me on this.

  • Jimmy Wilkins Sep 13, 2010

    Just checking in to see if you thought of anything different.It might clear up a few mins, then

    back to the same thing.

  • Jimmy Wilkins Sep 15, 2010

    Anything new on my problem?



    Thanks for your help.

  • Jimmy Wilkins Sep 16, 2010

    My computer relearns it's self,but will not stay fixed.Any ideas?

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Hi! Please try this. Open the hood and remove the positive battery connector then let it sit for atleast 5mins. Reconnect the battery connector again then put the key on ON position for 10 secs. but don't crank it. Turn off the ignition again then put it on ON position again then wait for another 10secs. then start the car. This will make the computer relearn itself and hopefully it works on you. Hope this helps and thank you for using FixYa!

Posted on Sep 11, 2010

  • dj_relly999
    dj_relly999 Sep 13, 2010

    No problem, just want to get your car back to normal. Have a nice day!

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Have to replace all ignition components, timing chain, crank shaft sensor, then This car can idle in all day

Posted on Sep 11, 2010

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