2015 YUKON NOISE IN CABIN

uaedenali · December 31, 2015

I have a premonition that those shocks might wear soon specially that they are not designed to work with disconnecting power and what I read and understand that those shocks has a Magnetorheological fluid that might leak so I will keep the bilstien shocks in my store and wait to see how mag shocks works.

guys,what I am trying to do is sharing my experiences with those issues that everybody is suffering I might fail and the things I done might work for sometime or it might work for ever so I will keep updating you gents.

The Zip · December 31, 2015

Disconnecting the mag shocks with certain set-ups may cancel out some of the stiffness in the chassis. As long as the ride is like butter and no problems show-up, I would go with it for a while. The goal is to get whatever type of comfort you can until or if GM comes up with something better. If you have 22’s, throw a smaller wheels into the mix if you can and see what additional that does for you. Also, ask your tech the question if disconnecting the Magnetic Ride shocks equivalent to riding with the PRS. The characteristic of the PRS to me is a bit bouncy, but the ride is soft and pretty dominating on smooth surfaces.

16Denaliguy · December 31, 2015

According to spokesperson Tom Wilkinson to Autoblog, the company "has been tracking this issue for a while." The problem has a fairly low incidence rate, but when it does occur the issue can be "uncomfortable and annoying for owners." There's no precise cause for the issue, Wilkinson claims, and in some cases, simply balancing the tires or changing the door seals can make it go away.

That's the first I've heard about changing the door seals. Is there a technical service bulletin out on that? I've had 6 new tires installed on the rear and all the tires have been road force balanced more than I can count. It did not simply make it go away!

FogDucker · December 31, 2015

That's the first I've heard about changing the door seals. Is there a technical service bulletin out on that? I've had 6 new tires installed on the rear and all the tires have been road force balanced more than I can count. It did not simply make it go away!

Same here. 2 new tires, many balances and a complete rear axle. It did make for a smoother ride, but had no affect on the buffeting. I believe that the vibrations and the buffeting are two distinctly different issues.

The buffeting may all be related to Helmholtz resonance. There are many interesting articles about this online, such as this one or this one. The examples speak mostly about when one or more windows are down and the car drives at speed. I think we're experiencing a variant of this with our windows up. Bumps and/or swirling air [different pressures, "vortex shedding"...] may be causing the hatch [or rear glass] to move - bouncing in/out and causing the buffeting. We are inside a really big speaker and the hatch/glass is the woofer. The Tesla folk had a nearly identical experience, solved by correctly fitting the rear hatch stops. So did some Porsche models - all had hatches. Who knows, maybe the slow speed "boom" might simply be the hatch shifting around in ways that it shouldn't.

I've been experimenting with this over the last couple of days and have been able to manipulate the buffeting via the rear hatch and/or glass. I've adjusted the bumper stops and placed styrofoam pieces in various places, both on the hatch and the rear window seal. Sandwich it in top, bottom, sides... I've got the buffeting to get worse and better by limiting the amount of inward travel. Where exactly, I'm unsure.

Air/pressure/Helmholtz also fits nicely with what we've observed - buffeting can affect any of our K2XX SUVs irrespective of wheelbase size, engine size, transmission type and options. All of our SUVs do share the same seals [?] and hatches. The pickup trucks do not have this problem.

Happy New Years to all.

Edited December 31, 2015 by FogDucker

Elripster · December 31, 2015

If that large expanse of roof is floating, any disturbance will cause it to buffet. While reducing the forcing factors is good, that roof has to be fastened down or trust that something will find a way to excite it.

If you roof is fastened down then looking elsewhere makes sense. Otherwise for buffeting I recommend addressing that first.

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FogDucker · December 31, 2015

If that large expanse of roof is floating, any disturbance will cause it to buffet. While reducing the forcing factors is good, that roof has to be fastened down or trust that something will find a way to excite it.

If you roof is fastened down then looking elsewhere makes sense. Otherwise for buffeting I recommend addressing that first.

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I forgot to mention that - my roof was fine the whole time. The field engineers took down the headliner and all the bows were intact.

Elripster · December 31, 2015

I forgot to mention that - my roof was fine the whole time. The field engineers took down the headliner and all the bows were intact.

Did you personally check this? If not I would suggest to do so. Watch the roof while you shut the door. If the roof jumps it is not attached now even if it was then.

Frank

FogDucker · December 31, 2015

Did you personally check this? If not I would suggest to do so. Watch the roof while you shut the door. If the roof jumps it is not attached now even if it was then.

Frank

I did not personally check it.

Yeah, it jumps but no more than my friend's 2014 Tahoe which is quiet.

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Elripster · December 31, 2015

Yeah but the roof sheet metal on the newer vehicle is VERY thin as is the sheet metal on the rest of the truck. This roof needs to be fastened down. When mine was attached the buffeting was completely gone. Now that it is floating again the buffeting is back.

What I am saying is that one cannot conclude that because a previous generation of vehicle had a detached roof that this generation can also tolerate that.

Frank

spacetiger · January 1, 2016

The article linked over to Fox News.

Fullsize GM SUVs have a problem that's making owners sick

http://www.foxnews.com/leisure/2015/12/31/fullsize-gm-suvs-have-problem-that-making-owners-sick/

yahtzee · January 1, 2016

The article linked over to Fox News.

Fullsize GM SUVs have a problem that's making owners sick

http://www.foxnews.com/leisure/2015/12/31/fullsize-gm-suvs-have-problem-that-making-owners-sick/

This is great to see. That was what I had hoped would happen. In some strange irony, I went to the dealership today to sort through some availability of 2016's within a 150-200 mile radius so that I could get something DX'd in for my buyback. My sales guy knew I had opened my search up to include Onyx Black and had just gotten one DX'd in. I told him that I had already driven that one and it had the same buffeting and vibrations that my initial Yukon XL had. He said, "I don't think you have." Sure enough, I checked it out and it had 6 miles on it. Checked the sticker and it was optioned as if I had ordered it myself. Took it for a drive and NO VIBRATIONS. Buffeting was slight but far less noticeable than my initial Yukon XL. It's the first one I have driven that didn't have it. I have it for a few more days to be sure but could it be?

FogDucker · January 1, 2016

This is great to see. That was what I had hoped would happen. In some strange irony, I went to the dealership today to sort through some availability of 2016's within a 150-200 mile radius so that I could get something DX'd in for my buyback. My sales guy knew I had opened my search up to include Onyx Black and had just gotten one DX'd in. I told him that I had already driven that one and it had the same buffeting and vibrations that my initial Yukon XL had. He said, "I don't think you have." Sure enough, I checked it out and it had 6 miles on it. Checked the sticker and it was optioned as if I had ordered it myself. Took it for a drive and NO VIBRATIONS. Buffeting was slight but far less noticeable than my initial Yukon XL. It's the first one I have driven that didn't have it. I have it for a few more days to be sure but could it be?

Purple unicorn - they don't exist! ;)

I wonder if GM is testing / measuring a good one and a buffeting one side by side.

How does one measure buffeting? Is there an app for that? ;)

yahtzee · January 1, 2016

Purple unicorn - they don't exist! ;)

I wonder if GM is testing / measuring a good one and a buffeting one side by side.

How does one measure buffeting? Is there an app for that? ;)

Ha! I know what I know and I have definitely become even more sensitive and picky than I was prior to my first GM purchase 5 months ago but this Yukon feels like I expected it to feel. Time will tell.

Elripster · January 1, 2016

That is great news.

Frank

16Denaliguy · January 1, 2016

The article linked over to Fox News.

Fullsize GM SUVs have a problem that's making owners sick

http://www.foxnews.com/leisure/2015/12/31/fullsize-gm-suvs-have-problem-that-making-owners-sick/

It's pretty cool to see all these publications and news authorities reporting these issues for the 2015 Tahoes, Suburbans, Yukons, Denalis and Escalades. But, they are missing the reports on the 2016 model years that also have some of the same exact issues. Most are only reporting the headliner fixes and not the PIT5429 bulletin that first addresses some of the other issues such as the harsh ride, noises, vibrations.