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2007 yukon electrical probs

Discussion in 'Audio & Electronics' started by Roy Goodwin, Nov 10, 2019.

  1. Roy Goodwin

    Roy Goodwin TYF Newbie

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    Jun 1, 2019
    I have an 07 yukon that I’ve had nothing but trouble with since I’ve bought it seems like. We used it to go trick or treating and piled all the kids in the back and drove with the hatch open so they could hop in and out as needed, got a service suspension light. A few days later got service stabile track light, service traction control and the park assist was turning off and on while driving as well as a flashing abs light. Twice while driving the speedo has quit working and when that happens it shifts REALLY hard into 2nd and pretty hard into 3rd. It’s completely random and sometimes you can hop in it and make your destination with no lights or problems, other times not so much. Replaced negative battery cable and have cleaned all chassis grounds with no success. Anyone else have this issue?
  2. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    Mar 11, 2017
    NE. FL.
    The service suspension message probably stems from leaking air shocks on the rear or possibly the compressor or both. You had the hatch open with people sitting all the way at the rear. The auto leveling sensors detected the added weight and probably commanded the compressor to turn on and inflate the rear shocks to compensate for the added weight. Something (shocks or compressor or both) didn't function as intended, so it set the message on your dash to let you know it wasn't working properly.

    The Stabilitrac, Traction control, and ABS are all tied in together... it could be something as simple as a wheel speed sensor.

    The speedo working intermittently is most likely caused by low voltage. These trucks have ECM, TCM, BCM, etc and they can be finicky and act up when the voltage gets low.

    Changing the ground cable on the battery is a good start but only part of the equation.

    I would start by having the battery load tested to be sure it isn't on it's way out and then replace the positive battery cable as well as make sure all of the cable connections are clean and tight. Also the under hood fuse box on the drivers side wheel well is a known spot for possible corrosion where the fuse box seats down onto the connections underneath. Grab the gray handles on either side of it and lift up and pull up on the fuse panel to disengage it from the connectors and take a look at them for corrosion. Clean them with electrical contact cleaner and then spray them down with some dielectric grease or something similar and reseat the fuse box down on them and lock the handles back down.

    A good scan tool, like the Tech2, can give you a better idea of what is causing the ABS, etc. lights instead of just guessing at it.

    Hope this gives you a starting point and fixes your issues.
    Last edited: Nov 10, 2019
  3. avalonandl

    avalonandl Full Access Member

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    Apr 6, 2019
    Troy, MICH & Naples, FL
    I' m with Kbus. The issues sound like a bad battery or conncetions.
    swathdiver, wjburken and kbuskill like this.
  4. swathdiver

    swathdiver Full Access Member

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    May 18, 2017
    Treasure Coast, Florida
    Yep, sounds like rear suspension maintenance a new battery are in order.
  5. BG1988

    BG1988 Full Access Member

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    Nov 14, 2018
    check the ground wire form the engine to the chassis GM is still stuck in 1965 with daisy chaining the ground

    you have a high resistance path and when that happens crazy shit happens... See the photo

    seems when the alternator is going you don't have the issue and when the battery is charged the alternator shuts off and you have the issue.

    (battery is effected by temperature )


    Turn everything ON inside then roll down the window to see if the lights dim or boggle down the engine..
    (also note how fast the windows roll down)
    you should be able to roll all 4 at the same speed. I noticed this as being an issue before the battery replacement as one window was faster then the others ... now they go the same speed

    turn on the defroster to turn on the compressor and rear blower heated seats etc....
    Last edited: Nov 12, 2019

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