Anon2015

That's because he is largely talking BS. The tech is repeating, or attempting to repeat, what someone else told him without having any understanding or background as to the cause, solution, or of acoustic/vibrational dynamics. "The low speed booming over bumps is due to the fact that the sound of the rear suspension has to go somewhere and it resonates in the cab." Ok; but, in a properly engineered vehicle it (a) wouldn't go inside the cabin environment; and, (b) the resonance frequency of the cab would have been damped. That being said, if that statement were 100% accurate, why is it not an issue with all other vehicles? (let's keep it simple...in last year's Tahoe/Yukon line). BTW, the resonance inside the cabin would change based upon interior volume and number of salt water sound absorption bags -- humans and dogs. Buffeting due to aerodynamics of the vehicle. Ok. In a properly engineered vehicle, bracing would have been installed to prevent vibration at the buffeting frequency(ies). Furthermore, multiple changes to the roof and roof damping materials resulting in no change to the buffeting. It should be noted that should that statement be 100% accurate, the buffeting frequency would change between LWB and SWB vehicles and, based upon what I have seen, that is not the case. That falls under the category of "if you want to B***S***t me, come up with something better." BUT ON THE BRIGHT SIDE...he just admitted GM has a design flaw. He has admitted to a design flaw which would have been easily discovered during testing (prior to production and product release), and therefore admitted to negligence on the part of GM. On the other hand, he is not an engineer, nor an employee of GM...so he didn't admit to anything, he simply accused GM (I certain GM will be happy about that); but, if he is repeating an official position of GM as was told to him by a GM employee, maybe we can all get free replacement vehicles.

That would be true. OTOH, I have run across a few sales people who didn't know the rear glass could be opened.

You can notice such things in your user manual.

In response to YukonTruckman Posted 13 April 2015 - 09:16 AM Anon2015, on 11 Apr 2015 - 9:21 PM, said: Can you elaborate on this? Are you talking about the 2015i models or upcoming changes for MY2016? There are several people here with 2015i's that have the buffeting. Thanks. MY2016. Other items 'apparently' in MY2016 will be changes in the Infotainment/Radio which were originally supposed to be in the MY2015 Yukons, and the third row seats will really lay flat. Mine do not lay flat, most do not lay flat (or even with each other) and they will either be fixed, replaced with MY2016, or GM can deal with my attorney, the FTC, and me.

Actually, they have admitted it (indirectly). Their customer satisfaction surveys has a long list issues which you may have experienced (water leaks from antenna, buffeting, wind noise...dissatisfied with the radio, etc.). So, they know of the complaints, problems and issues. They have made changes in the 2016 models to 'fix' the problem. Back to the survey. Good luck getting a buy back for that problem if, on the survey, you say it isn't a problem.

It may be helpful to some if when you mention something like "GM Service Bulletin PIT 5318", you provide a link to the document.

BEA likely a better choice...but too time consuming and "not my job".

Exactly the point Wing. NHTSA is required to track and maintain all filings. The fact you don't see any popping up is be cause only one or two have been filed! So you are exactly correct...if only a few people file, they aren't going to have the complaints online (I do know of two). You think they learned nothing over the whole Cobalt matter? Exactly the point Wing. NHTSA is required to track and maintain all filings. The fact you don't see any popping up is be cause only one or two have been filed! So you are exactly correct...if only a few people file, they aren't going to have the complaints online (I do know of two). You think they learned nothing over the whole Cobalt matter?

The recall department is going to totally ignore you. You don't take issues like that to GM...you file them with NHTSA (online). GM can ignore you until the cows come home. They cannot ignore NHTSA. Stating your issues here is informative and helpful. Stating your issues with NHTSA is actionable.

The dealer collects the tax and forwards to the local taxing authority. GM doesn't see that money. You, however, can apply for a refund (local jurisdictions will vary).

That sucks. How long did it take to come back?

What?! Rolex would replace that watch (not repair it) and it would have nothing to do with "good will". First, they wouldn't argue the point, and adversely impact their brand image. Second, that would mean their internal quality control failed and they'd want the watch back to determine what when wrong and where in the QC process did they fail. On something far less severe they would repair the watch. Pick a better example. The value of the Rolex brand is far, far more important to Rolex than GM is to GM.

Drove #3. Today. Nope, no buffeting, no pulsing pressure, no vibrations...still a crummy Bose system with overly aggressive bass.

If CCC is no help, the BBB Autoline is an attention grabber. While the Bose audio system is a cheap, poor excuse for audio in a car at this price point and the Bose ANC does have 'issues', it is the effect or symptom. It is not the cause. With 1000 of these being pushed out the door every day and only a small number of people reporting the problem, you can see why it isn't high on GM's priority list. That being said, those who have had medical issues, required consultation with a doctor, experienced dizziness, vomiting, disorientation or ear pain should be reporting these matters to the NTSB. That's the only way (a) it will really get attention and (b) there will be a published cause and resolution. Neither ZIP nor myself can be of much help since we don't have the issue. As to individual sensitivity...yes, that is highly likely and equally likely problem vehicles are on the road and the owner is not aware of it. In my case, as an acoustician, I can tell you my two do not have the problem. When number 3 arrives that may change.

Yes to cross bars. Kodiak ... think Range Rover but more capability, more thoughtful features (like EPIRB/SatComm, water storage, alternative power source, adjustable ride height, arrival/departure angle improvements, etc).

The underbody shield is a GM accessory for the Yukon...it is installed under the engine/transmission and transfer case. They are NOT skid plates but do provide some protection against FOD kicked up under the vehicle. Skid plates are not available for the 15 yukon at this time; but, the under body shield will serve as a pattern for steel skid plates. No fleet. Going to build two Kodiaks. I bring the UBS up here ruminating about the change in air flow below the vehicle, not 'loose' items.

Tobek - "But am reluctant to remove the grills, don't want to break them. So yesterday I placed two pieces of thick masking tape over each of the three Mic's" Placing tape over the grills will leave an air gap and open air around the microphone...this will create resonance which you do not want (and further you changed the volume around the microphones. The cotton ball method damps the resonance which you do want. I have two, driven three, and a third on the way. It strikes me for me to escape the problem others are having, I should be entering the lottery. That brings up a question...have any of you, who have this buffeting/pressure problem had the GM Underbody Shield installed? I haven't driven a Yukon without one. I haven't driven a Yukon with the buffeting problem.

What spectrum analyzer and microphone did you use? Did you record the data and print out the plot?

"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.

2015 Denali and 2015i Denali. Neither with this problem.

"Adapts" I suppose that could be possible but I'd question that in general ... what does it 'adapt' to and when does it know conditions have changed and the adaption is no longer of value? Adaption would also mean it is not compensating for the addition or subtraction of salt water bags as they are added and subtracted from the cabin. Salt Water Bags = humans and dogs (great low frequency absorbers).

Just a couple of points -- (four actually) 1. The microphones would not have 'brains', clearly; however, it could be possible that the failure of one microphone would shut, or fault, the ANC system. That does not appear to be the case. 2. If there is a microphone behind the headliner and that headliner moves (fairly quickly), that would create a false signal to the ANC system. Microphones do not measure sound ... they measure changes in air pressure which is exactly what a 'flapping' headliner would do. 3. It appears the only 'success' has been to damp the changes in air pressure at all microphone positions. 4. With the pin extraction tool for the connector, one could disconnect all microphones noted as 'noise compensation' and see what happens. If the result is the same as the tape and cotton ball exercise, then there is your fix.

I would suspect the mics are doing some variety of spatial averaging.

I too have the Intellilink Manual...I did a full text search on several terms and did find where the Bose AudioPilot noise "compensation" feature can be turned off but nothing saying the Active Noise Control can be turned off. I am also at a disadvantage since neither of my Denali's exhibited this problem. Wrench...to get that manual, call customer (no)service and they will email the PDF of the manual to you.)

Both of mine have active noise control. Neither have a menu option to disable active noise control. The Yukon Denali lists Active Noise Control as a standard feature. It is not listed as standard or as an option for the SLE/SLT versions (which is no indication of what is actually in the SLE or SLT).