Any update on this? My 16 Tahoe is now making the exact same sound. Wondering if you have been able to get this fixed. Thanks in advance.
2017 Denali fluttering when accelerating. VIDEO
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Any update on this? My 16 Tahoe is now making the exact same sound. Wondering if you have been able to get this fixed. Thanks in advance.
DenaliDrivinDad
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I had mine in the shop twice since posting my video in this thread. The first time they detected a misfire and replaced the fuel feed pipe again along with the fuel pump.
The noises did not go away. I opened a case with GMC and it went back to the shop again this time with the attention of a GM regional service manager and a field technician.
He said he found nothing abnormal. The regional service manager reminded me I still have the 5 year/60,000 mile power train warranty and if something happens they will fix it. Yet, I'm the one that has to live with this vehicle that sounds like a noisy clunker.
The noises did not go away. I opened a case with GMC and it went back to the shop again this time with the attention of a GM regional service manager and a field technician.
He said he found nothing abnormal. The regional service manager reminded me I still have the 5 year/60,000 mile power train warranty and if something happens they will fix it. Yet, I'm the one that has to live with this vehicle that sounds like a noisy clunker.
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A misfire should generate a code and maybe the CEL - did you have either?
DenaliDrivinDad
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I didn't have a CEL. I believe the misfire may have been detected when they were testing the vehicle during the visit when they replaced the fuel pump/pipe.
DenaliDrivinDad
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So after picking the vehicle up yesterday, I noticed it was substantially quieter despite the GM field engineer claiming he only performed diagnostics. I've inquired to the dealership to attempt to determine if an ECU reflash or any type of adjustment was done.
The vehicle still has a few of the same noises, but they are significantly less noticeable and tolerable that the noises I showed in my video on this thread.
I really wish I knew what took place. For all I know they took something apart during the diagnostics and put it back together better. Or perhaps added something to dampen the noises like a missing plug in the firewall. I'm just guessing here. I just hope the thing remains quiet.
DenaliDrivinDad
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It must have been wishful thinking on my part. Today we are at 82 degrees with a relative humidity of 62% and the noises are louder than ever. This powertrain hates humidity.
denali17gmc
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No real update on a solution....
After contacting GM one of their technicians said the noise was "normal" and that they are aware of the issue.
I asked them which it was, was it "normal" or a known issue? Its really just a way of them "copping out" and I did t feel like fighting this any longer at the moment.
I ended up getting the borla exhaust through another dealer to try to mentally cover up the noise for me and now the exhaust is letting off a Loud rattle. This damn truck is really testing me ...
DenaliDrivinDad
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I gave up and got rid of mine after 1 year. The money and time isn't worth my sanity. No more GM vehicles for me. After 1 year it was literally rattling everywhere and the plastic creaked horribly. Not acceptable for a vehicle over $70,000. The ride grew rougher as time passed and it was very uncomfortable at 9600 miles.
Mine was paid for, so I got a 2017 Toyota Tacoma Limited and a check for my remaining equity. When I took the Denali over railroad tracks I literally thought it or I was going to fall apart. So harsh. The Tacoma rolls over bumps with ease. It is amazing to me that a vehicle that cost 40,000 can feel so much better than the Denali.
I've always preferred the appearance of GM vehicles. They do great there. Customer service, reliability, durability, and quality control, well apparently those things didn't exist with my last two GM vehicles.
The fluttering noise around 1,500 rpms when lighlty accelerating is totally normal and is emitted when the engine is in V4 mode. At cruising speed, the engine automatically switches from V8 to V4 to save fuel. If you go under the Trip A or B tab on the DIC (Driver Information Center), on the bottom right you will see an icon that tells you when it is in V4 or V8 mode.
Acter listening to that video it sounds like that was a much larger issue, possibily with the electronics and the engine was stuck in V4 mode. Typically the engine would have already made the swith to V8 with that amount of acceleration. Sorry to hear you traded it in.
Acter listening to that video it sounds like that was a much larger issue, possibily with the electronics and the engine was stuck in V4 mode. Typically the engine would have already made the swith to V8 with that amount of acceleration. Sorry to hear you traded it in.
Tahoedrivingmom
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Thank god I'm not crazy! I've had my 2017 Tahoe Z71 in the shop 6 times since May, trying to get them to find the source of the issue. The service technicians all insist that they didn't hear it. After picking it up for the final time this past Friday, they told me the GM engineer said it was a completely normal noise that occurs when it switches from V4 to V8. I cannot believe that I spent this much money on this vehicle for it to sound like it has a huge exhaust leak. Surely GM will find a fix for this. This was my first and will for sure be my last General Motors vehicle I ever purchase. Very poor quality.
Does it go away when you disable AFM? You can check by putting transmission in "M" or "L" and advance the gear selection to 5. It will shift normally through 5 and AFM will not be enabled. If so you might want to try the "$1 fix" described here:
http://www.tahoeyukonforum.com/threads/the-1-00-cat-back-mod.65748/#post-825530
http://www.tahoeyukonforum.com/threads/the-1-00-cat-back-mod.65748/#post-825530
dbbd1
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Nashoba
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I have been playing with the M5 disabling of the AFM for a couple of weeks now. It makes driving in town so much smoother. I have not tried it above 40 mph as the highest speed limit in our town is 35. And when on the highway, i want AFM activated for the higher mile age benefits. We have this on our 2008 Tahoe Hybrid and it is nearly invisible/undetectable during normal operations. The engine stop feature is far more noticeable than any other feature. And during operation, the change from engine to electric motor and back the other way is virtually undetectable. On my 2015 Silverado, the AFM is very evident while in town but has been slick and smooth on the road. I have not detected any "flutter" in either vehicle, just a direct change when the AFM functions at low speeds. But, once again, perhaps my age effects what I notice. Having learned to drive in a pasture filled with buffalo "wallows", in a 1949 Studebaker pickup when I was six, I look back and find the complaints about today's vehicles to be relatively minor compared to some we had to deal with back in the day.
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It's not the AFM in my case either. I've tried the M5 trick. The sound is there like an exhaust leak when the engine is around 1200-1700 rpm and slight acceleration is applied. And as I stated in an earlier post, this only happens after the engine has reached normal temperature. When cold, there is no sound and everything is smooth. I strongly suspect it's the torque converter/transmission. I plan to take it to the dealer again soon.
Tahoedrivingmom
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If you don't mind, let me know what they tell you. This is the exact problem I have and am getting nowhere with the dealership.
I have the same issue on my 15. It has been there since new although I can only hear it with the windows down. Additionally it can not be heard by bystanders, only heard from inside the vehicle with window down. I to suspect the transmission as I have had a surge on acceleration since new as well, the surge is much more prominent when the ambient temperature is lower.... The surge can be so bad it makes everyone look like some kids from the late 90's jamming to Nirvana. Its either low line pressure or torque management. One day I will see if a tune takes care of it.
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GTNator
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I took the Tahoe in to another dealer. They kept it 3 days and researched all of GM’s service bulletins. I got it back with an all new exhaust system. As expected, it did nothing to solve this issue. I had even told them I don’t think it’s the exhaust. I don’t think the dealers know how to fix this.
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