SierraMyst

I know this is an old thread, but I just wanted to say thank you. I have a 2023 6.2 Tahoe HC with 2k miles on it with this same squeal at start up, when stopping, and when attempting to accelerate aggressively after cruising and a slow and moderate speed (passing). It's loud with the windows down. Sad. The noise was also present in a 2023 Escalade with 100 miles and another 2023 Tahoe Premier with 12 miles. All 6.2L engines. The dealer says it is a normal sound from the exhaust when using DFM. The noise is gone when driving in manual mode (L9). This truly sucks. I can't believe GM thinks this is acceptable on $92k truck.

I actually bought mine in a different state as well. But serviced the truck in both states. And ultimately the law in my states said that I must file for lemon law in the state that vehicle was serviced the most at. So at 60 days out of service, with 31 of those in PA and 29 of those in VA, I filed in PA. The GM customer service agent is a nobody and has no authority to approve or deny a buy back. That is done at the Corporate risk assessment general counsel level. You'll never get to speak to them. Only your attorney can. The customer service person's sole job is to be a liaison between you and the dealer and like an insurance agent deny all claims. They are the lowest man on the totem pole. And will never agree with you. Its funny...I remember my customer service rep telling me that there is nothing at all GM will do for me and that they will not be making any repair attempts and that GM will NEVER buy back the truck. To stop calling. Complete dick. I would sit in my service directors office while he was on the phone with them and the dealership would literally tell GM that they've done all they can do and they are "not able to fix the legitimate problems". And minutes later, GM would call me as I sat in front of the service director and tell me that he got off the phone with the dealer and that they have "made all the repairs they can make and that PER THE DEALERSHIP, the truck was driving as designed". Scumbag liars. If you have a good dealer that's trying to fix the problem, they'll pit customer and dealer against each other. They don't want to pay for the warranty repair for the dealer as much as they don't want to buy back the truck. It's all statistics to them. If they sell 100,000 Yukons and 10,000 are bad and all 10,000 go to the dealer for warranty. They will deny the issue on all of them. Of those, 5 out 10 people will just accept it. 3 out 10 will fight for a repair, and eventually get something done that will improve but not fix the issue and 2 out 10 will get a buy back. And all that was cheaper than properly repairing or recalling the whole 10,000. Remember the ignition switches. It's cheaper to pay for a couple deaths than to fix every ignition switch. So long story short. Days out of service are days out of service regardless of the dealer as long as it's a GM dealer. Test drive and record the test drive and have the tech acknowledge the issue in front of you. Then see if he denies the issue to his service director. So good luck.

Laws will vary by state. See the addendum in your manuals to see what the requirement is for your state. Lemon law attorneys will take the case free, but you'll need good documentation. Most places it's 3 repair attempts or 30 days out of service. You've already started logging it with Customer Service. Keep all the communications with them. Record the calls. Log the name of the rep and what they said. If they get rude or nasty log it. Document everything, date time, person and what was done. Did you do a test drive with the tech? I could drive mine and duplicate the buffeting everytime at 42 and 71 mph. That's when it's the loudest. Tell them you want to drive with the tech. Drive it with them, duplicate it. Have him acknowledge it. If they still refuse to acknowledge it. Record and document it. Meet with he Service Director and General Manager of the dealership. They are just as liable for denying your warranty claims as they are at failing to repair it. And the 30 days out service is for anything, not just recurring issues. So if theres something wrong, anything. Put it for service. Ohh....and you can take to ANY dealership. GMC, Cadillac, Chevy. So you can take it to different dealership and have them fix the buffeting. Log as many visits as possible. Ultimately, if you really want the buffeting fixed, you need to be pushing for new tires that Road Force Balance below 15 lbs of Road Force. Push for Michelins with customer service and they dealer. Speaking to service directors for the varying dealers in the area. They were all aware of the tires being the patch for the buffeting. The Chevy dealers response to customers with the issue regarding id they would replace tires was "absolutely NOT", the GMC dealers would work with us and customer service on the issue, and the director at Cadillac said they replace the tires on every Escalade that had the issue. Goes to show, the more you spend the better you're treated. Ultimately, GMC and Customer Service replaced my tires with Michelins and the buffeting went away for about 10 months and slowly began to come back, especially when I was towing.

Finally resolved all the issues with the Yukon. Our lemon law settled on Friday. And now the issues belong to GM. It took about a year from when we started the process, but it's done. And having had the truck paid off, it was nice to see GM cut a big fat check back. The truck spent 108 days in service in it's first year. And the issues still persisted. We gave GM a chance to swap it out with a 2017 model, and they said no. That they wanted another opportunity to fix the buffeting and booming as well as the transmission clunking and shudder. This is in addition to the nav going out, the power running stopped working, the water through the GPS antenna, the rear spoiler splitting, the buzzing from the AC, the back up camera cutting out, the dash rattles, etc. After they couldn't fix it on the 4th attempt, the dealer tried to get GM to authorize an exchange. And GM said no a second time. Actually, the customer service rep said, "We will not be buying anything back or attempting anymore repairs. The truck is functioning as designed despite what the dealership says!" I said ok. My attorney will take it from here. It's not that the truck had issues..it's that despite the dealership agreeing that there were indeed issues and they wanting to honestly fix them, it was the fact that GM corporate and GM techline straight up told the dealership to not fix it. There were many things done and swapped out at the expenses of the dealership. I can't say enough great things about the dealership experience. But GM's customer service is a complete joke. So if you're need some 22" complete Denali wheels Or anyone of many accessories for your Yukon, Suburban, or Tahoe They can all be found in the wanted for sale market place thread.

Copy. Just messaged you.

So I'm selling the dampers from my Yukon the dealer put on to lessen the booming sound. I took them off once they agreed to replace the exhaust for the newer model. GM part number 10199232, retail for $60 to $85 a piece. There's 5 (2 together for the mount at the cat). The brackets are for the 6.2L so it's 3.5" exhaust. But the mounting brackets are replaceable. Looking for $25 each, so $125 for the set. Shipping is $30. They are heavy, meant to weight down the exhaust to keep the reverberation from exhaust from entering the cab. Message me if interested.

I'm selling my new never installed Motofab 1.5" front spacer level kit. http://www.gm-trucks.com/forums/topic/200378-15-motofab-aluminum-level-gm-2007-2017/

We're vehicle shopping now..we need a third row. It's a shame that these vehicles are but like crap. We're looking at Infiniti QX80, the Volvo XC90, the Lexus GX and LX, the Nissan Armada, but what we're really holding out for is the new Range Rover Discovery to be reals ed in May/June. Saw it at car show and it was stunning. Starting price of $48k. As I've said ..GM replaced the 22s with 20s. Replaced the tired to Michelins. My dealer handled it all since Consumer Affairs kept telling no, no, no, no. 62 days in service...they want a lemon law case. Anyways. The tires and rims fixed the vibration and buffeting. They replaced the exhaust and added the dampers, but the booming is not really fixed. It not as loud...but it is more constant. The foreman at the dealership said that the 2017 does indeed, without a doubt have a new exhaust for the 6.2L. Problem is when he tried to order for a 2016, GM ships him the old exhaust. He says this will continues until they clear the warehouse of the old exhaust. We're currently working on acquiring the new exhaust. In the mean time...There's a new metal buzzing coming from under the passenger side. It sounds like it's coming from the A/C, but non of the A/C components are making the noise. But if you shut off the A/C it stops. So it seems that the A/C compressor is making something different vibrate. We have 4 kids, and as much as we want a 3 row SUV with the Yukon XL storage space, we're moments away from a lemon law and going back to a minivan.

Replace the tires with Michelin Premier or Touring HP. They will balance below 10 lbs of road force. This will eliminate the buffeting and pressure. The booming is a separate issue.

My Yukon had 62 days of service and was a day from lemon law filing. GM covered the everything under warranty as they should have. You should not be paying for these out of pocket. Call Customer Service and open a case.

Any updates on your booming?

So I took the 22s off, had Michelins mounted on the 20s. The buffeting is faint at the 40 mph range, and the buffeting at the 70 range is completely gone. The truck rides like it's gliding on air. It's like you don't even know it's there now. One the drive home there were times I looked down and was shocked I was going 85/86. I had to slow down. The vibrations were my indicator before. I knew I had hit 72 when the shake would start. We ordered 5 dampers and installed 4 like other have. I realize that other that had this done had a short wheel base. So it yiu look at FogDucker's photos, his muffler is immediately after the mesh joint. So his 2nd damper is right before the muffler. On mine being an XL, I had a long stretch of pipe between the mesh joint and the miffler. We placed the second damper in the middle of that pipe. My booming is significantly reduced. But not completely gone. I'd say about 85% gone. I'd attribute this to the 6.2L XL exhaust being much longer and larger than the short base 6.2L or the 5.3L like Ozzii has. So when I return for an oil change, we'll put the 5th one on. We're just going to slide the #2 damper in the middle of the pipe to the left and put it again the muffler and put anot her damper directly after the mesh. FYI... 1) The dampers do not come with ubolts. GM has the dealer pick up basic items frim local shop or parts distributors that work for the dealership. So the part number for the ubolts Ozzii listed are specific to that dealership. 2) The dampers ubolt holes are sized for the 5.3L pipes at 2.75 inchest i believe. The 6.2L exhaust is wider at 3.5 inches. The shop foreman ordered the specific ubolts bracket assembly that fit the 3.5" piping. The Yukon is a great drive now.

My 20" Denali wheels, Michelin Premier tires, and dampers are all in at the dealer. Going Wednesday to have everything done.

Wow...Thanks Marc. This is incredibly helpful.

The dampers have arrived at the dealerahip. But the 20" wheels are still on back order. I need help. Dealer isn't getting good instructions on the damper placement. I have the location of 4. need that pic and location of the 5th. @FogDucker, @Ozzii could I get a location list and a pic of the last one. FD, you mention you were coming through VA. Im off I-95. I'd be happy to crawl under there and take the pic.