2015 YUKON NOISE IN CABIN

Michael Klug · November 30, 2016

Anyone remember what page the link to the video showing the roof fixing while driving? I missed that somehow. Who posted it?

Post #2034

ajs800 · November 30, 2016

We took the plunge and went with a 2016 Suburban LT with 20k miles. Wanted one since having a rental on vacation last year, but I was nervous about the aforementioned potential problems. We test drove it for a day before deciding, just to be sure.

-It has no buffeting at any speed. The video of the buffeting and roof vibrating earlier in this thread is crazy!

-No booming, even over rough roads

-The vehicle definitely has a vibration when it switches to V4 mode with slight pressure on the accelerator. We decided that this wasn't a deal breaker. I previously drove a 2015 and 2 2016's and all three had the same issue.

Overall we are very pleased with the truck and glad we chose one with some miles (depreciation) on it and a CPO warranty to 48/100.

Does it have stock wheels and tires? If so, what wheel size?

.

Michael Klug · November 30, 2016

Does it have stock wheels and tires? If so, what wheel size?

.

Yes it does. 18"

Duramaxman05 · November 30, 2016

I have been reading all the posts about noise in the cabin and the V4 buffeting. We had a 2016 Yukon SLT with all the booming/buffeting noises and had GM do the trade asssist. We then bought a 2017 Tahoe Premier, had the dealer take the 22" tires off as they were hard to steer and made noise. The dealer put on 20" and it made a big difference. The problem we have now is at low speeds and somewhat bumpy roads the booming in the cabin drives my wife crazy. I was following Fogducker thread and he had weights added to his exhaust. I mentioned it to the dealer but he had no idea which to order and if it would work. We drove a Tahoe LT with 18" tires (same noise) then drove a GMC Denali 6.2 with noise cancellation (same noise). We only have 400 miles on it and the wife refuses to drive it and wants to get rid of it. We got rid of our 2007 Tahoe LT for this one. Can anyone help with this issue? I would like to try the exhaust dampeners if anyone has the right Part numbers.

SierraMyst · December 1, 2016

Yes it does. 18"

There's the answer again. The buffeting is caused by the roof sheet metal.

Vibrations pronounce the issue. Softer tire with more side wall and lower road force absorbs the shock so it's not as pronounced. Hence the 20s are better and the 18 are best.

I have been reading all the posts about noise in the cabin and the V4 buffeting. We had a 2016 Yukon SLT with all the booming/buffeting noises and had GM do the trade asssist. We then bought a 2017 Tahoe Premier, had the dealer take the 22" tires off as they were hard to steer and made noise. The dealer put on 20" and it made a big difference. The problem we have now is at low speeds and somewhat bumpy roads the booming in the cabin drives my wife crazy. I was following Fogducker thread and he had weights added to his exhaust. I mentioned it to the dealer but he had no idea which to order and if it would work. We drove a Tahoe LT with 18" tires (same noise) then drove a GMC Denali 6.2 with noise cancellation (same noise). We only have 400 miles on it and the wife refuses to drive it and wants to get rid of it. We got rid of our 2007 Tahoe LT for this one. Can anyone help with this issue? I would like to try the exhaust dampeners if anyone has the right Part numbers.

So...there's no part number. GM engineers will not admit they exist. The first dealer I went to contacted GM tech line and they said it didn't exist. I gave them the VIN number for another vehicle that had it done, and the dealer refused to push it.

Went to a second dealer. They called GM tech line, and they said they don't exist. Gave him the VIN of the other Yukon, they called the tech line and called them out on their lie.

The GM engineer admitted that they DO indeed exist. But my truck didn't qualify for it.

They are now in the process of getting approval to replace my wheel to the 20s and get Michelins put on.

They he will then escalate the dampers to his regional manager who us the override the engineer.

My service manager seems to believe that GM initially declining the dampers and denying it to avoid doing a massive recall/service bulliten.

Edited December 1, 2016 by SierraMyst

boazEarl8 · December 1, 2016

My service manager seems to believe that GM initially declining the dampers and denying it to avoid doing a massive recall/service bulliten.

IIRC someone here had the exhaust fix and problem still returned or am I mistaken?

If so, likely denying it for the same reason the prior roof bows repair was pulled - doesn't last

SierraMyst · December 1, 2016

IIRC someone here had the exhaust fix and problem still returned or am I mistaken?

If so, likely denying it for the same reason the prior roof bows repair was pulled - doesn't last

I think we're talking about two separate issues.

The 5.3L exhaust/muffler has an issue where it creates "buffeting" in V4 mode.

There's a PIT that calls for its replacement.

One of the members, Leslie?, had muffler replaced and the buffeting under V4 mode returned. She has since accepted it and now drives in M5 mode to keep the truck out of V4.

The booming at low speed is present in the 5.3 and the 6.2L.

We believe that the sheet metal issue is an all around thing that affects the roof and under carriage.

The exhaust is not properly secured or loosely secured to the under carriage and all the small bumps in the road jar it causing the flexing on the body and booming sound in the cabin that resembles a bass drum.

The fix for this seems to be the adding of weight dampers to the exhaust. 6 to be specific. And this keep the exhaust from being jarred up and down on bumpy roads.

FogDucker had it done.

Wish I knew of more folks that have had it "approved" by their dealer and GM.

I did find it interesting that one of the repairs my first dealer did to my 6.2L was to loosen the exhaust bolts and let the exhaust "settle into its natural position" and then tighten it back down.

Edited December 1, 2016 by SierraMyst

ajs800 · December 2, 2016

There's the answer again. The buffeting is caused by the roof sheet metal.

Vibrations pronounce the issue. Softer tire with more side wall and lower road force absorbs the shock so it's not as pronounced. Hence the 20s are better and the 18 are best.

So...there's no part number. GM engineers will not admit they exist. The first dealer I went to contacted GM tech line and they said it didn't exist. I gave them the VIN number for another vehicle that had it done, and the dealer refused to push it.

Went to a second dealer. They called GM tech line, and they said they don't exist. Gave him the VIN of the other Yukon, they called the tech line and called them out on their lie.

The GM engineer admitted that they DO indeed exist. But my truck didn't qualify for it.

They are now in the process of getting approval to replace my wheel to the 20s and get Michelins put on.

They he will then escalate the dampers to his regional manager who us the override the engineer.

My service manager seems to believe that GM initially declining the dampers and denying it to avoid doing a massive recall/service bulliten.

Yes, it's either sheet metal, strictly frame/body/mount, or combination of all that is the culprit. I think I've posted this before, but we recently had to replace warped rotors and even though the pulsating drove me nuts, the buffeting was horrendous when braking due to the vibration through the body of the truck. So yes, any type of vibration or unbalance through the frame creates the buffeting.

I really don't know if it's a design issue from the sheet metal as much as it is the link (mounts) between body and frame. If there was better absorption between the two, the thinner sheet metal wouldn't probably be an issue, in my opinion.

Edited December 2, 2016 by ajs800

Leslie Wasson Green · December 2, 2016

IIRC someone here had the exhaust fix and problem still returned or am I mistaken?

If so, likely denying it for the same reason the prior roof bows repair was pulled - doesn't last

This was me. I have had 2 separate exhaust systems place on my truck. The last one fixed the buffeting issue for ohhh about 2 weeks, then the noise slowly came back.

Michael Klug · December 2, 2016

This was me. I have had 2 separate exhaust systems place on my truck. The last one fixed the buffeting issue for ohhh about 2 weeks, then the noise slowly came back.

Are you referring to the vibration that occurs in V4 mode w foot on the accelerator?

Or the "buffeting" accompanied by pressure in the ears?

From what I understand there are 3 potential issues with these vehicles:

1. V4 vibration

2. buffeting

3. booming (when driving on uneven pavement)

Do I have that right?

Leslie Wasson Green · December 2, 2016

Are you referring to the vibration that occurs in V4 mode w foot on the accelerator?

Or the "buffeting" accompanied by pressure in the ears?

From what I understand there are 3 potential issues with these vehicles:

1. V4 vibration

2. buffeting

3. booming (when driving on uneven pavement)

Do I have that right?

I don't have a physical vibration when my Yukon goes into V4. I have the intense pressure/buffeting when it goes into v4 and stays there.

I also have the booming at slower speeds when on slightly uneven pavement.

zfasts03 · December 3, 2016

I let a few lbs. of air out of the tires, seems to help some for the low speed booming. Running 33-34 psi now.

cltsig · December 3, 2016

Are you referring to the vibration that occurs in V4 mode w foot on the accelerator?

Or the "buffeting" accompanied by pressure in the ears?

From what I understand there are 3 potential issues with these vehicles:

1. V4 vibration

2. buffeting

3. booming (when driving on uneven pavement)

Do I have that right?

Let's not forget

4. High speed vibration.

Are you referring to the vibration that occurs in V4 mode w foot on the accelerator?

Or the "buffeting" accompanied by pressure in the ears?

From what I understand there are 3 potential issues with these vehicles:

1. V4 vibration

2. buffeting

3. booming (when driving on uneven pavement)

Do I have that right?

Let's not forget

4. High speed vibration.

Ozzii · December 3, 2016

I just ordered the Dampeners at my dealer. Unfortunately they are going to charge me 89 bucks a pop for these. If it ends up solving the booming noises at slow speeds, I will argue for them to reimburse me. At this point Im desperate, but ill keep you posted one the parts come in.

Duramaxman05 · December 3, 2016

I just ordered the Dampeners at my dealer. Unfortunately they are going to charge me 89 bucks a pop for these. If it ends up solving the booming noises at slow speeds, I will argue for them to reimburse me. At this point Im desperate, but ill keep you posted one the parts come in.

Do you have a part #?

I put a vibration meter in and it was much worse in the back. We are still waiting to hear from the field rep.