Question about 2002 GMC Yukon XL

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I have a 2002 gmc yukon denali xl with 6.0L engine and i have a brand new alternator and battery, but when i brake medium-hard, the voltage drops to around 5 on the meter and the lights flicker. sometimes it stalls out after hard braking. please help.

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  • dmonterroza2 Mar 28, 2009

    I also have an '02 Yukon not the denali but the 5.0 liter shorter one. It has been stalling when i try to pull in a parking space or when backing out of one. When I come to a stop the the battery gauge drops, the headlights dim for a couple of seconds before the battery voltage picks up again. I'm stalling maybe 3 to 5 times a day now. I think this has to do with my ABS motor going bad. I have removed the fuse like I read somewhere in here. Someone please help!!! I don't know what to do and I hope it is not an expensive fix. I'm on a tight budget. Thanks in advance.

  • skidoomike09 Apr 07, 2009

    I have a 2002 yukon denali with the 6.0L and it staulls most of the time in reverse. Also has a very low idle so possibly the idle control valve is bad. not to sure can you help

  • 28cmod May 06, 2009

    I too am having a similar issue. I have a 2002 Denali XL with the 6 liter.
    Put the truck in drive/reverse and the idle drops, lights dim, truck stalls unless I give it enough gas to keep revs up. Tester shows battery and alternator are good. Next thing for me is to test ground and fuses for something loose but I am doubtful that is the issue. Thanks in advance!

  • jrowley May 19, 2009

    My 2002 Yukon Denali XL does the exact same thing when coming to a stop the RPMs drop to 400 or below and the voltmeter drops to around 11 and sometimes it stalls. I cleand my EGR and it was not stuck open. I also changed all the plugs and wires. I had the alternator checked and the battery. The only thing left is a computer tuenup or some way of adjusting the low idle. I think the alternator is kicking out at the lower RPMs due to a switch that tells it to stop putting out voltage. If anybody finds a solution please share.

  • Anonymous Mar 13, 2014

    How do I bleed the brakes on a 2002
    Yukon Denali



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My 2002 had same problems and to fix, I loosened the hose clamp on the throttle body air intake to air box hose. Then opened the butteryfly by hand and used throttle body cleaner, used carb cleaner on another, and removed all the black grime that collects around the throttle body butterfly. About every forty thousand miles i have to do this. I have 123k on mine now and have done it three times. Fixes the low idle, dying in reverse, lite flicker and alternator dropout.

Home it works, if it does

Posted on Dec 20, 2009

  • jdh0901 Sep 28, 2010

    This is spot on. I've had this happening to my 01 GMC Yukon since last year. Purchased a IAC valve and a can of Throttle Body Cleaner. After spraying the butterfly and throttle intake with cleaner and old rags. I am now driving a new vehicle, the idle issue is a non issue and the truck idles like a new vehicle. Thanks, I am no longer looking for a new vehicle.


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This is the exact problem I had. I checked my battery and alternator. I cleaned my egr. I changed my wires and plugs. Finally, I found a solution!!!! The throttle body has a small port on the top of it that continuously allows air to flow past the open and close adjustment flap. I am sorry but I am not very technical. What you do is pull off the air filter hose attached to it and take a engine cleaner and clean and spray out the carbon out of the small port. I did this and instantly my truck stopped idling bad. I found out the EGR port is connected to this and carbon would clog the hole, so the engine would start to stall at low idle speeds.

Posted on Jul 15, 2009

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Check the ground lead from the battery to the starter for corrosion, and make sure it's tight. Hope this helps

Posted on Jul 06, 2009

  • Frank Fulton
    Frank Fulton Jul 06, 2009

    Check the ground lead from the battery to the starter for corrosion, and make sure it's tight. Hope this helps


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FROM: LustyKid

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