CCDenali

It is my understanding that much of that is already present in the '15 model and that mostly cosmetic changes were made for the '16 model. From the article it sounds like perhaps the one change I am picking up on is they may of reprogrammed or worked out the kinks in the new 8 speed transmission. (I regret having my wife talk me out of the 6.2 / 8 speed when we go ours). I think 8 speed will be working its way into all of the trim levels if it hasn't already. As far as the mounting frame "shear body mounts & hydraulic engine body mounts" as well as the noise canceling and other features It seems like this is just a continuation from the 15 model. http://www.gmc.com/2015-sierra-denali-pickup-truck.html I am a bit skeptical that a true 100% fix will never be available due to the fact GM would need to adjust the frame resonance issues which would require tons of money for redesign, resubmitting crash test ratings, as well as recall on every truck/suv with this frame. Perhaps I will be proven wrong and they will change the mount materials or find some type of dampener to limit the resonance but likely we wont see a true fix until a redesign for the next generation models and GM will continue to patch and band-aid to protect their bottom line instead of their customers interests.

Yes Denali's have the same. I have a 2015 with magneride. I have been following the forums a bit but have not posted updates since around page 455. Mine was previously plagued with vibration issues at all speeds and road conditions (different from what most people complain of AFM shimmy change or 35-45 70-80mph). Had to drive to Houston (Beck & Masten North) to get service on this as the local Corpus dealer I took this too was evasive, did not want to acknowledge the issue, and was zero help (will not be bringing business there in the future). (Autonation). In Summary my back and front shocks were replaced, front struts, went through multiple tire set balances, magneride computer reprogramming and this has resolved vibrations about 80% from before. They think that the Magneride was engaging too often when traditional shocks should of been taking care of the bumps in the road causing a bad shake (in console, seats, front and back). Now that the above issue is resolved I am in the same boat as many other 1500 models which is harmonic resonance brought about by the frame at specific speeds (75mph 45ishmph) or the shimmy that takes place when AFM engages. There were a few posts prior to yours (tnchevy and dave07 to just name a few who have keyed in on this) discussing general thoughts on this and GM likely knowing what the fixes for the harmonic resonance but someone at GM has done cost analysis that indicates band-aiding the issue is more profitable than actually correcting it. At this point I am convinced this is a design flaw in the frame/mounting of the vehicle and issues with tolerance levels for moving parts being very slim now (explains why some fixes work for some but not others). Any 1500 model will have this (including some of the SUV's built on the same frame) Magneride does a good job of handling vertical bounces/shake (speed bumps, etc) It is quite smooth compared to the loaners I have driven in this respect and is a good addition to the truck however it does not address or greatly diminish some of the horizontal shake or resonance that is brought about by the frame and the way this is mounted.

However this makes me cringe reading this again. 18 tires....14 wheels...this does not bode well. This whole process is making my hair turn grey early.

Thank you for the recommendation. I am in the Corpus Christi area but the drive would be well worth having this issue resolved and would save me from a Houston trip (the greater evil). Even further affirmation that this is likely a tire/rim related issue (image below). They marked the tire placement in yellow and I have had that much slippage under 50 miles of driving (looks about 2 inches). The vibration continues to move around every time they replace and re-balance tires and becomes more pronounced in different speeds and at different parts of the truck that continues to make me think (or at least hope) its just tires/rims. http://s661.photobucket.com/user/Christof83/media/20151125_183437.jpg.html?sort=3&o=0 I would assume a dealer would give me some type of credit for the tire and continue to cover this under warranty despite what the last dealer I went to was telling me. Once I get that established that if I change tires its still covered I'm going to try swapping them and then have them professionally balanced at a shop in San Antonio that many members have recommended. http://southwestbrakeandalignments.com/index.html

Received my truck back from the dealership today. They claimed a 2nd tire was now out of road-force balance at 26lbs this time. With having another tire bad within 15 miles of them saying it was ok previously makes me very suspect on their capability of getting this right. They mentioned they drove this around as they should for 15-20 minutes after road force to warm up the tire and then road-force once more however they decided to stop trying to make this better once they hit the very high end acceptable limit at 15lbs. Vibration is not quite as bad in the steering wheel but the passenger side still shakes quite a bit and has developed a consistent creak / squeaking noise on top of the visible shaking. Ride quality is still a bit rough. When asking about rim run-out measurements and the road-force results they did not give me this information despite saying so in previous phone calls so I am stuck taking their word for it. They said they ran a pico scope test on everything and even took off the rear end to inspect and measure the ring and pinion (.008in backlash no more than .001 variance). They did not provide the pico test results as they mentioned they would before running the tests so again I am just stuck having to take their word for it without being able to confirm again with hard evidence. Not surprised they purposely did not tell me this information as I would likely zone in on parts that are borderline and it would give me further detail and right to force them to continue analyzing what is wrong with my vehicle. At any rate assuming they are being straight regarding the pico test results this puts the focus again on tires. I had asked multiple times if I could purchase an upgraded set of tires (not even asking for a trade in) but I keep getting reluctance and excuses like it will void my warranty or limit their ability to troubleshoot or replace tires as it is not the original tires sold with the vehicle which does not seem like a legitimate excuse to me. (what happens if I catch a nail and have to replace a tire....) I just keep getting the impression or feeling they don't want to deal with it any longer and want me out the door. That's their decision I suppose and they shouldn't fault me on my decision to not want to consider their lot when purchasing my wife's next vehicle soon. Again they didn't sell me the truck but this is going to force me to potentially travel 4.5 hours to see about tire upgrades or give the selling dealer a chance to look at and correct this and get a needed second opinion. Going to give the seller dealership a call tomorrow and see what help they can be. Since I am 85% sure the major culprit is tire and balancing related I am going to push for a tire upgrade and special order something that hasn't been sitting on the lot forever or even something that has been recycled from other vehicles potentially. Then if I notice vibration still I am going to take it to a shop in San Antonio I know of that does true balancing with the tires on the vehicle for optimum results. Too much hassle for a new vehicle ​

Update: Starting to get the runaround from the dealership now Received a call last night from the main service manager (whom I have not dealt with yet) indicating this is normal...When asked what tests were done to confirm this and targeted questions as to how he came to this conclusion he was clueless as to what is actually going on with my truck. He wasn't even aware of the "work" they had already done (roadforce balancing). I should of asked him the color of my truck as I bet he would of got that answer wrong as well. Sounds like standard evasive dealership maneuvers if you ask me. Received a call again today from the service manager I had been working with who started out with the same this is normal BS. Come to find out they haven't even placed it in a bay to examine this further. I asked why the mechanic would tell me this was not normal and then the vehicle wasn't even looked at since that point and how they are able to come to this conclusion without concrete evidence or testing other than the biased head service manager's opinion who doesn't want to deal with this problem. At any rate they are going to run the tests. I requested they do roadforce on all tires, measure rim runouts, use the picoscope to measure vibrations and provide me with all of this data so that we can compare against what is "acceptable" amount of vibration for GM. I hate going through this and playing this game but at least i'm prepared. I guess the best advice is to just stick to your guns and be persistent and polite while documenting well. It is legal in my state to record phone calls with 1 party (myself) consent so I have begun doing that as well. I will not shame this dealership or staff yet because I believe in giving people the opportunity to first do what is right or the chance to earn my future business but depending on if they continue to handle this poorly I will be sure to make you aware of what location this is. I may have to take it to another dealership here soon... I just want my truck working the way it should and its sad there are all these hurdles in place the keep that from happening. In my business you would be out of business for handling customers this way.

Yea after further reading and discussing with the mechanic the locking nuts if they were off an ounce or so wouldn't really show itself unless at high speeds if that. A true balancing with the wheels on the vehicle would eliminate concern of this. Dealer thinks its not tires since they previously road force these however I am not certain as the vibration grew worse after they replaced and re-balanced everything. They will begin looking at drive line/ drive shaft balancing, ring pinion, axle, and break out the picoscope. I requested if they road force to provide the results for each tire. My vibration is perhaps a little different from what I've read or seen described which makes me think it is indeed just poor tires or balancing but that is yet to be seen...at least that's what i'm hoping for rather than already replacing components on a 700mile vehicle. Symptoms: 1.) Happens at all speeds. Mechanic on ride along noticed it even in the dealer concrete flat parking lot. 2.) Vibration is within the steering wheel as well as the center console, passenger seat, as well as back seat according to friends who have sat in the back to review. 3.)You can visually see the passenger seat hop if nobody is sitting in it. Center console will shake water or rattle whatever is in the cup holders. You can visually see the steering wheel shake as well as the gear selector handle. 4.)Steering wheel vibration is consistent and quick...reminds me of the groove lines of a highway with varying degrees of severity. On rough roads it feels like all four wheels are not planted firmly. It causes poor control/traction. On flat or better quality roads it is still present and can be noticed on deceleration or acceleration. This does not matter if it is within 4cyl or 8 cyl mode. A bit of info that I'm not sure if I included or not initially this all started after carrying 4 adult passengers and roughly 400lbs of weight in the bed (two wall units and small end pieces). I began noticing the day after this although when the balancing happened it made this even more pronounced. If this is weight in the bed related then perhaps it is ring and pinion which I've read can cause both passenger and steering wheel vibration. First time I took it in they replaced 1 tire saying it road force balanced at 27lbs..not sure if weight could bring a bad tire to surface either. At any rate with my somewhat limited mechanical ability its really just guesswork research on my part...I'll be sure to report what changes once I get the truck back.

Update: Went for my ride along today with a service mechanic for my 2nd appointment for the issue. He was very straight with me and acknowledged the vibrations I am getting. He mentioned he would try and oversee what is being done with the tires to ensure proper balancing. They are going to attempt to forcematch and roadforce balance once again. I brought up the possibility of getting GM certified tires or trading in for a better quality tire. I will press for this further if the 2nd attempt does not correct this. The process of doing this properly I believe is the following: Forcematch all wheels and tires Measure Rim Runout with tires removed Use Stud adaptor and not the centering cone Do a Centering check on the Hunter machine Roadforce Balance all tires under 15lbs. I will be requesting the specific numbers on the tests. Once the tires are looked at again they will be using a Pico scope to test vibrations on the passenger seat and steering wheel. He acknowledged having a bulletin that explains how troubleshooting this is done as well as having the proper Pico scope for this type of test. I take the truck in Monday. A GM rep will be on site Wednesday for unrelated things but will try to be pulled over to take a look at the truck if issues persist. I will let you all know what comes out of it. Fingers crossed this isnt a major issue as its already a major headache (what i believe is the full bulletin) http://oemdtc.com/6392/information-on-vibration-analysis-and-diagnostic-2014-2015-chevrolet-silverado-gmc-sierra

In my case it made my problem significantly worse. Now I am getting passenger seat vibration as well as steering wheel / center console vibration. I suspect they were not done properly or the machine was not calibrated or operated in manual mode. I will get specific numbers when visiting the dealer again. Another thing to note. I'm curious if locking lug nuts could cause a balance issue. I have not weighed them comparatively to the standard ones but I've read these can be up to 1.5oz and that often adding a counter balance to the inside of the rim may counteract it. Since the tires are put on a machine without the lug nuts I could see how this would feasibly throw things slightly off however i may be way offbase or perceiving this would need to be done at high speeds. I noticed that the right side tires have weights both on the inside and outside of the rim while the left tires only have them on the outside of the rims. Can anyone with experience confirm if this could cause an issue? Also found the following from another forum post. A good bulletin explaining the troubleshooting tips for vibration issues. http://oemdtc.com/6392/information-on-vibration-analysis-and-diagnostic-2014-2015-chevrolet-silverado-gmc-sierra

Sigh...Terrible to see this is appearing so frequently. Does not give me much hope for my new truck. Count me as one of the sufferers of the dreaded vibration/shake. 2015 GMC Sierra Denali 1500 5.3L purchased a few weeks ago. Haven't even made first payment on it. First 600 miles drove as smooth as can be. Received many compliments on the ride quality...620 miles in I noticed vibration. At all speeds. Center console has some shake and passenger seat feels like a massage chair. I do notice the slight surge people bring up when transitioning but the vibration does not matter if it is in V4 or V8 mode accelerating or decelerating. Have just got it back from the dealer after round 1. This does not bode well after reading some of these comments... In my case the first time around they noticed one of the tires was bad and their road force balance machine was saying that 27lb's of weight needed to be added to the tire to correct it.....WOW I don't understand how this was driving on the road with that much of a weight being required... After doing some reading it makes me want to have this done at an independent shop or other dealership to confirm......Some recommended a shop in San Antonio which is likely worth my drive. http://southwestbrakeandalignments.com/index.html at any rate for the meantime I will go with the cost free warranty option as who wants to pay service money on a vehicle the just drove off the lot..... I received the truck back today QC and shop signed off on it as being "fixed" however when driving away from the dealership I immediately felt the vibration again. Drove it on different roads at varying speeds and with someone else in the car to confirm i'm not losing my mind (this forum also greatly helps in that regard). Will be taking it back next week when a rental car is available so that it can be looked at once more. From what I can gather from my reading through the forums thus far is this seems to be a combination of issues with varying experiences. I am trying to gather a full list so I can be educated as to what I need to speak to my dealer about. Please feel free to add or correct me if I'm wrong in this summary/assessment. Most common appears to be Tires, out of spec, need "trueing" or road force balancing. Many people appear to go through multiple tires. (using the stock goodyear btw in my case) In order of what I feel is most common so far (tires being most common) drive shaft alignment or out of spec pinon preload weight hubs differentials U joint ball joints tie rod ends shocks axle rear end motor mounts needing to be shimmed 3mm body frame mounts I'll be sure to update after my 2nd visit to see what is changed and try to get some specific details as to how the tires are testing (Picometer if possible, tire weights being used, road force test results)