2015 YUKON NOISE IN CABIN

The Zip · January 20, 2015

20sierra14 - The GMC dealer is just around the corner, I'll attempt to use my VIN first to see if that works. If I can get a set of grilles, I'll send the end product to you for a test run.

lsumatt154 - to my knowledge, GM has not issued a fix to the problem. Everything you read on this thread will not fix the issue, only mitigate the issue and make it more tolerable until or if a fix is issued. There is a member following this thread who was able to get his dealership on board, but the dealer only disabled one of three mics. It would be valuable info if the dealer disabled all three.

Edited January 20, 2015 by The Zip

LSUMatt1514 · January 20, 2015

Has GM issued any kind of statement, and at least acknowledged that there is a problem and they are actively working on it?

The Zip · January 20, 2015

If that was the case, this thread would not have been 558 posts deep. But I will say the train has left the station and if you get on board at this point, respectfully request you read some of the early pages to get up to speed.

Edited January 20, 2015 by The Zip

Chris M. · January 21, 2015

Has GM issued any kind of statement, and at least acknowledged that there is a problem and they are actively working on it?

At least according to this thread, which I've read all of, the answer is no. Aside from buying back a couple of vehicles and issuing a TSB that did not fix the problem, they have acknowledged nothing.

Ccamp5 · January 21, 2015

Well our ordeal is OVER!!! To recap…we had a 2015 Chevy Suburban LT with a manufacture date of 8/14. We had two main issues with ours: Severe Vibration at all speeds and the buffeting (to the point I have had several ear infections, kids have thrown up in the car and headaches on long trips). After having it in and out of the dealers service center 8 times they called in a GM Engineer.

When meeting with the GM Engineer we found out some very interesting things. 1) the vibration is the same vibration that they were having with the newly designed 2014 pick-ups and we were told that there has recently been a change in the manufacturing process to eliminate the vibration. 2) They believed the buffeting was coming from behind the sunroof, and having to do with the cross bar supports coming undone. He stated that some things had been changed in manufacturing process to eliminate the buffeting issue. He told us that he has a machine that they can hook up on the inside of the car that will measure the "buffeting"/pressure. If we did have the buffeting then they suggested the fix of taking the headliner down, sunroof out, and epoxying/gluing the cross beams back to the roof. (FYI…they don't cut the top of the car off as others have stated.) After speaking a while longer we left the car with the GM Engineer for the day.

Shortly after we left, We get a call and were told that upon the test drive that the GM Engineer could feel/hear the buffeting without having to hook up the device they use to measure the buffeting. And that ours was one of the worse cases that he had heard. Upon discussion with our Service MAnager and GM Engineer they recommended the fix of taking out the sunroof. We were hesitant but were told that we had to at least give GM the chance to try their fix. We agreed. We received a text from our Service MAnager that stated that there was a "gap" that was bigger than it was suppose to be. After two days we get it back, and of course the buffeting & Vibration was still there. We told them we wanted a new car or we would sue/file lemon law.

At this point our dealer was willing to do anything to make us happy. We told them we wanted another Suburban because it is the only vehicle that could accommodate our family. And after speaking with the GM Engineer about their being changes in the Manufacturing process, we had hopes the issue on a new one would be fixed. After some back and fourth, GM finally bought back the LT for what we paid for it, and we purchased a 2015 Chevy Suburban LTZ that was manufactured in January 2015. It was manufactured 1/7 and we picked it up on 1/12. We drove it around for 3 days… There was no Vibration and No buffeting at all. We have driven it 700 miles home and have roughly put another 600 miles more on it. There is still no buffeting and no vibration at all. It drives like a dream!!!!!

I will also add that there is no "low hum" in the LTZ when it is in V4 mode either, like their was with the LT. With the LT you could feel and hear when the vehicle went back and fourth between V4 and V8. With our LTZ the switch is so quiet and subtle, that you cannot tell if it is in V4 or V8 unless you look at the dash.

We are very thankful that our dealer was so involved. They were the ones that made the GM Engineer come out to try to fix the vehicle and they are the ones that went to bat for us and got GM to pony up the money to purchase the vehicle back. We would not have gotten the results that we had, if it had not been for our dealer.

I would also like to make a comment about the post on here about it being the ANC (Active Noise Cancellation). The LT did not have the ANC yet we still had the buffeting issue. The ANC does not come standard on the LTZ it is something that has to be added. The LTZ we have now does not have the ANC either. So I am not sure that the ANC is the whole problem. I would think if there is a "gap that shouldn't be there" behind the sunroof that could possibly be letting air in, that this may effect your ANC trying to compensate for the problem, making the buffeting worse. Just a thought.

From speaking with the GM Engineer, he didn't come right out and say it, but GM knows there is a problem. I think they have fixed it in the manufacturing process (hence the reason the LTZ manufactured in 1/7/2015 does not have the issue), but I don't think they have figured out a fix for the vehicles currently on the road, as my guess there is more than one component causing the buffeting.

Chris M. · January 21, 2015

Well our ordeal is OVER!!! To recap…we had a 2015 Chevy Suburban LT with a manufacture date of 8/14. We had two main issues with ours: Severe Vibration at all speeds and the buffeting (to the point I have had several ear infections, kids have thrown up in the car and headaches on long trips). After having it in and out of the dealers service center 8 times they called in a GM Engineer.

When meeting with the GM Engineer we found out some very interesting things. 1) the vibration is the same vibration that they were having with the newly designed 2014 pick-ups and we were told that there has recently been a change in the manufacturing process to eliminate the vibration. 2) They believed the buffeting was coming from behind the sunroof, and having to do with the cross bar supports coming undone. He stated that some things had been changed in manufacturing process to eliminate the buffeting issue. He told us that he has a machine that they can hook up on the inside of the car that will measure the "buffeting"/pressure. If we did have the buffeting then they suggested the fix of taking the headliner down, sunroof out, and epoxying/gluing the cross beams back to the roof. (FYI…they don't cut the top of the car off as others have stated.) After speaking a while longer we left the car with the GM Engineer for the day.

Shortly after we left, We get a call and were told that upon the test drive that the GM Engineer could feel/hear the buffeting without having to hook up the device they use to measure the buffeting. And that ours was one of the worse cases that he had heard. Upon discussion with our Service MAnager and GM Engineer they recommended the fix of taking out the sunroof. We were hesitant but were told that we had to at least give GM the chance to try their fix. We agreed. We received a text from our Service MAnager that stated that there was a "gap" that was bigger than it was suppose to be. After two days we get it back, and of course the buffeting & Vibration was still there. We told them we wanted a new car or we would sue/file lemon law.

At this point our dealer was willing to do anything to make us happy. We told them we wanted another Suburban because it is the only vehicle that could accommodate our family. And after speaking with the GM Engineer about their being changes in the Manufacturing process, we had hopes the issue on a new one would be fixed. After some back and fourth, GM finally bought back the LT for what we paid for it, and we purchased a 2015 Chevy Suburban LTZ that was manufactured in January 2015. It was manufactured 1/7 and we picked it up on 1/12. We drove it around for 3 days… There was no Vibration and No buffeting at all. We have driven it 700 miles home and have roughly put another 600 miles more on it. There is still no buffeting and no vibration at all. It drives like a dream!!!!!

I will also add that there is no "low hum" in the LTZ when it is in V4 mode either, like their was with the LT. With the LT you could feel and hear when the vehicle went back and fourth between V4 and V8. With our LTZ the switch is so quiet and subtle, that you cannot tell if it is in V4 or V8 unless you look at the dash.

We are very thankful that our dealer was so involved. They were the ones that made the GM Engineer come out to try to fix the vehicle and they are the ones that went to bat for us and got GM to pony up the money to purchase the vehicle back. We would not have gotten the results that we had, if it had not been for our dealer.

I would also like to make a comment about the post on here about it being the ANC (Active Noise Cancellation). The LT did not have the ANC yet we still had the buffeting issue. The ANC does not come standard on the LTZ it is something that has to be added. The LTZ we have now does not have the ANC either. So I am not sure that the ANC is the whole problem. I would think if there is a "gap that shouldn't be there" behind the sunroof that could possibly be letting air in, that this may effect your ANC trying to compensate for the problem, making the buffeting worse. Just a thought.

From speaking with the GM Engineer, he didn't come right out and say it, but GM knows there is a problem. I think they have fixed it in the manufacturing process (hence the reason the LTZ manufactured in 1/7/2015 does not have the issue), but I don't think they have figured out a fix for the vehicles currently on the road, as my guess there is more than one component causing the buffeting.

Very interesting. Thanks for the update. Is yours considered a 2016 model? Does the 10th character of your VIN have an F, G, or H?

Edited January 21, 2015 by Chris M.

Ccamp5 · January 21, 2015

Very interesting. Thanks for the update. Is yours considered a 2016 model? Does the 10th character of your VIN have an F, G, or H?

10th character is F.

Edited January 21, 2015 by Ccamp5

jl449 · January 21, 2015

Ccamp..

That's great... Congrats with the new LTZ.

LSUMatt1514 · January 21, 2015

Can someone give me a quick cliff notes version of what manufacture dates the F, G, and H in the VIN represents? Thanks!

Edited January 21, 2015 by LSUMatt1514

The Zip · January 21, 2015

Ccamp - you have the 2015i (your character input corresponds to 2015). Paragraph 2 comment, if they would have tried it would not have worked (based on prior folks having that done), but this is the first time someone mentioned a machine to measure buffeting or pressure. There were also folks experiencing the buffeting that did not have a sunroof.

Did GM tell you what was different in this vehicle versus your last one? Does your new vehicle have a sunroof? Chime in every so often and keep the thread current

Mortman · January 21, 2015

F=2015 model

G=2016 model

H=2017 model (not sure why it's relavent here though)

Edited January 21, 2015 by Mortman

Wrench589 · January 21, 2015

Ccamp5, your story is very interesting and both encouraging (gM knows what the problem is) and discouraging (the only fix is a new vehicle).

I just got back from a 2 hour test drive where I drive the vehicle at various speeds under three conditions; with the microphones taped over, with the tape removed, and with fuse 48, which powers the amplifier, removed. Each run at a given speed was done over the exact same section of road, so this is a very good apples to apples comparison. I used a spectrum analyzer to measure the sound levels at the various frequencies. There are definite low frequency spike in the signature that are likely the "buffeting". I do not see much difference with and without ANC. There is significantly more difference due to varipying road conditions.

I was going to post that I am very convinced the problem is in the roof. As I posted several weeks ago, smack your headliner while inside the back and you will hear/feel the same noise and pressure. And, this makes more sense, since the rougher the road, the more it will excite the roof issue.

Also, I have the same vibration in the vehicle at all speeds. Feel it in the steering wheel and the seat. And, we picked ours up at the end of Oct, so definitely and earlier build.

This is sickening.....

The Zip · January 21, 2015

Two things going on - buffetting and shaking/vibration (S/V), I believe unassociated (although the S/V is causing the headliner to move more than normal, impacting the mics, resulting in a "version" of buffeting. My assessment, no facts). We are happy for Ccamp5, but he just went from a 2015 vehicle with problems to a 2015 vehicle without. If I didn't have the buffeting when I tune certain XM channels, I would have a 2015 without any issues. Until GM issues a fix for an acknowledged problem, we have to press on.

Buffeting: Good testing wrench, how do you recommend to stabilize the headliner. My recommendation would be to get a piece of plywood (3x3 maybe) and a couple of shower curtain rods. Place the rods under the plywood and stabilize the headliner. Test and see what you get. If the results are promising, there is a way the dealer can "fill" the empty space between the liner and roof (w/o the use of plywood and shower curtain).

S/V: The S/V reminds me of a wheel that has lost its or a magnet, this will cause the wheel and ultimately the vehicle and steering to shake and vibrate, higher the speed or uneven terrain, the more S/V. The amount of S/V depends on how many magnets were lost. The end result was the wheel was out of alignment. If this was happening to me, I would go to a "tire shop" and have him pull the wheels and check if they are out of alignment, regardless of what the dealer did.

And for everyone new to the thread, a customer shouldn't have to do this to their 70K vehicle, got it.

Edited January 21, 2015 by The Zip

Anon2015 · January 21, 2015

"From speaking with the GM Engineer, he didn't come right out and say it, but GM knows there is a problem. I think they have fixed it in the manufacturing process (hence the reason the LTZ manufactured in 1/7/2015 does not have the issue), but I don't think they have figured out a fix for the vehicles currently on the road, as my guess there is more than one component causing the buffeting. "

We'll see. I find it surprising your vehicle was built on the 7th and you took delivery on the 12th. In other words, built on Wednesday and you have it on Monday. You must be pretty close to Arlington or work for GM for that to happen. My third was built on the 8th. I believe it is currently in Neverland in a galaxy far, far away). It will be interesting to see if there are any apparent differences between them.

Edited January 22, 2015 by Anon2015

20Sierra14 · January 21, 2015

I was going to post that I am very convinced the problem is in the roof. As I posted several weeks ago, smack your headliner while inside the back and you will hear/feel the same noise and pressure. And, this makes more sense, since the rougher the road, the more it will excite the roof issue.

GM has already tried to fix this the roof..? What other part of the roof would be causing the buffeting?

Now the "buffeting" sensation could be enhanced due to road noise being generated up from the road into the cabin, then being heard by the ANC.. This could create a reverb sound (aka, what I would call, in my book, buffeting)...

Please forget the tape and cloth and be more aggressive w/ the cotton balls and tape.