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GMC Forum: 2009 GMC Yukon Denali XL - Electrical Problems
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Old 09-06-2016, 06:48 PM
JDubb1975's Avatar
JDubb1975 JDubb1975 is offline
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Drives a 2009 GMC Yukon Denali XL
Join Date: Sep 2016
Location: Highland Village, TX
Posts: 2
Question 2009 GMC Yukon Denali XL - Electrical Problems

First off, I realize that this has been a very big issue for A LOT of owners having scoured the entire internet for causes and solutions with answers all over the place. I figured I would try and start up a dialogue with some well-informed folks and see if I can get a more reliable diagnosis here than YouTube or at least someone who can point me in the right direction.

Here is my issue/set of issues, all while driving:

- Cruise Control works intermittently.
- Side Blind Zone System Unavailable error message appears and disappears randomly (usually for several minutes at a time).
- Sometimes while accelerating the vehicle lurches and the airbag indicator flashes several times. This is usually the precursor to an extremely wild electrical fit.
- All doors begin locking and unlocking, in quick successive bursts, very randomly.
- Loss of ability to accelerate. The engine revs but the transmission seems to disengage.
- Radio console shuts of suddenly and goes black, usually turns itself back on.
- AC shuts off and when it comes back up, the temperature has reset to 74 degrees. Sometimes at this point the vents will not blow cold, sometimes the heater is blowing, and there have even been instances where heat and ac are blowing alternately from the driver/passenger vents.
- Often while this is all going on the battery voltage drops significantly.

All of these issues usually happen together, randomly, and after the truck has been driven for some time...usually not right out of the driveway. The only solution I have found so far is to pull over, stop the truck, and let it sit a while. However, sometimes when I do this the truck will not is completely dead...even the dome lights. Sometimes I can let it sit a couple of minutes and it will start right up, and then sometimes it has to sit for 30 minutes before coming back to life.

I have had the battery and alternators tested - tested fine. I have also cleaned, greased and reseated all of the battery related contacts (battery terminals, mega fuse, main junction fuse seats and stabs, and the negative ground where it terminates near the front of the frame.) I have read countless messages where people have replaced batteries, battery cables, ground wires, door modules, ECMs and BCMs all with varying degrees of temporary and permanent success.

Has anyone encountered this issue that truly understands the root cause and the solution? Am I dealing with one issue or a few? Also, is there a GMC certified mechanic here knows how to fix this? Should I trade this sucker in and get a minivan or a non-power everything model? I am very frustrated, don't have unlimited time and money to chase this around.

Any well-informed help would be greatly appreciated.

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Old 11-02-2016, 12:06 PM
07denali 07denali is offline
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Drives a GMC Truck
Join Date: Nov 2016
Posts: 1

Mine is a 07 Yukon Denali xl 6.2 v8. Won't start, everything that basically runs off the keyfob has no power. I made a YouTube video showing my issues. I still hadn't figured it out. I've been searching all over the net, forums etc.
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Old 11-07-2016, 04:22 PM
zell66 zell66 is offline
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Join Date: Mar 2014
Posts: 18

Our 07 Yukon had many of those issues, A/C, Headlights fluctuation or pulsing, and so on. Voltage was high and low, basically all over the place. I put in a new alternator and ALL problems went away. Hope this helps.
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battery, electrical issues, side blind zone unav, yukon denali
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