2017 Denali fluttering when accelerating. VIDEO

[jason952]

Had the same sound begin after the the trans was rebuilt on out 2015.5, it was a loose exhaust.


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[Naz 23 Esky]

Picked up a 2017 Denali just over a month ago, been hearing a "fluttering"/rattling type sound when accelerating. I'd say it usually happens at about 1500-1700 RPM... occurs when you're asking for a little more speed and usually stops when at cruising speed.

Dealer said it's the sound of some exhaust valve with the purpose of keeping the muffler quiet... is this normal? Seems too loud to be normal. Video attached.

I sent this EXACT video to my dealer that's been looking into my truck since new. Been painful especially on roadtrips. I honestly wanted to leave the truck when irma hit Florida and we were vacationing down there because it was soooo annoying driving from Toronto to Orlando with that sound. They replaced lifters (upgraded versions) fuel lines some kind of vacuum and guess what sound still there. I love the car but this sound is killing me. Sad part is I'm not sure I still want them to continue to try to fix as I don't think they have a clue where the problem is coming from. I really hope someone has a success story that actually relates to this exact problem and it not related to other problems like the flapper valve ect.

 

[thecodeman]

Have the same sound on our 16 Tahoe. Sounds like an exhaust leak.


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[John878787]

Had the exact same sound on my brand new 17 Tahoe. At first they thought it was a twisted ground wire or possibly something with exhaust. It Turned out to be a bad seal where the steering column exited the cabin going under the hood which was allowing engine noises into the cabin from under the steering wheel. When they replaced the seal the sound was completely gone.

 

[Marchant]

Picked up a 2017 Denali just over a month ago, been hearing a "fluttering"/rattling type sound when accelerating. I'd say it usually happens at about 1500-1700 RPM... occurs when you're asking for a little more speed and usually stops when at cruising speed.

Dealer said it's the sound of some exhaust valve with the purpose of keeping the muffler quiet... is this normal? Seems too loud to be normal. Video attached.

Wondering if you have ever got this resolved? I'm experiencing the same on my17 Denali.

 

[JTRATX]

Had the exact same sound on my brand new 17 Tahoe. At first they thought it was a twisted ground wire or possibly something with exhaust. It Turned out to be a bad seal where the steering column exited the cabin going under the hood which was allowing engine noises into the cabin from under the steering wheel. When they replaced the seal the sound was completely gone.

Hmm, that's interesting.

 

[Marchant]

I sent this EXACT video to my dealer that's been looking into my truck since new. Been painful especially on roadtrips. I honestly wanted to leave the truck when irma hit Florida and we were vacationing down there because it was soooo annoying driving from Toronto to Orlando with that sound. They replaced lifters (upgraded versions) fuel lines some kind of vacuum and guess what sound still there. I love the car but this sound is killing me. Sad part is I'm not sure I still want them to continue to try to fix as I don't think they have a clue where the problem is coming from. I really hope someone has a success story that actually relates to this exact problem and it not related to other problems like the flapper valve ect.

I sent this EXACT video to my dealer that's been looking into my truck since new. Been painful especially on roadtrips. I honestly wanted to leave the truck when irma hit Florida and we were vacationing down there because it was soooo annoying driving from Toronto to Orlando with that sound. They replaced lifters (upgraded versions) fuel lines some kind of vacuum and guess what sound still there. I love the car but this sound is killing me. Sad part is I'm not sure I still want them to continue to try to fix as I don't think they have a clue where the problem is coming from. I really hope someone has a success story that actually relates to this exact problem and it not related to other problems like the flapper valve ect.

Any update? Mine is headed aback to dealer tomorrow for the 3rd time. Exhaust has been replaced, second time at dealer fuel line replaced (now it’s worse... hear it all the time, even while at cruising speeds)

 

[Marchant]

This is so strange to me... can't believe they consider this normal. It's really is extremely annoying especially because I spend much of my car travel time during the week returning work phone calls. I can hear the sound fluctuating as I adjust the gas pedal. Frustrating.

Any updates on if the dealer was able to fix yours? Mines in the shop for the 3rd time. They have replaced my exhaust, fuel feed line , and the noise continued. This time they have had it a week with no solution. GM has given them a long list of things to check but haven’t heard of a solution yet.

 

[Marchant]

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.

Did they find the problem in the torque converter/transmission? Mine is in the shop for the 3rd time. They have already replaced my exhaust, and fuel feed line but the noise continued.

 

[Marchant]

Any updates with a solution to the flutter noise?my 2017 Denali is at the dealer for the 3rd time. They have replaced my exhaust and fuel feed line. Neither fix stopped the noise. It’s been at the dealership for a week and they called yesterday and said GM gave them a very lengthy list of things to check.

 

[foxyjam]

Any updates with a solution to the flutter noise?my 2017 Denali is at the dealer for the 3rd time. They have replaced my exhaust and fuel feed line. Neither fix stopped the noise. It’s been at the dealership for a week and they called yesterday and said GM gave them a very lengthy list of things to check.

I’d be interested to hear if the dealership was ever able to provide any improvement or resolution to your flutter noise. Any additional details would be appreciated.

 

[Naz 23 Esky]

Guys the sound has been really quiet during the colder months. Hasn't bothered me much since we hit 10 Degrees Celsius and below. Like others have said I really don't think GM has a fix for this. Even the replacement rental Yukon I had while mine was in the shop experienced the same problem. Guess we're just going to have to wait.

 

[Marchant]

I’d be interested to hear if the dealership was ever able to provide any improvement or resolution to your flutter noise. Any additional details would be appreciated.

Well... my dealership has been wstill no resolution. The last time they had my car for 2weeks checking things, but GM would not allow them to fix anything because they already replaced my exhaust.
When leaving the dealership I was pretty much told “gm says it’s normal” but the service manager seems to agree with me... it should not be normal, or tolerated.
I was told I could take it to a muffler shop and have the passive exhaust valve cut out, and weld back together, or by an aftermarket exhaust to put in. I do not feel it’s my responsibility to do any of that when they will not confirm that that is causing the noise.
My Denali is going back to the dealership next week for the 4th time, but this time they are having an Engineer from GM come to the dealership to work on it. So... I will update again when I get it back...

 

[Sjp45066]

Guys the sound has been really quiet during the colder months. Hasn't bothered me much since we hit 10 Degrees Celsius and below. Like others have said I really don't think GM has a fix for this. Even the replacement rental Yukon I had while mine was in the shop experienced the same problem. Guess we're just going to have to wait.

Same here. The noise has completely disappeared during the colder months. I have heard it come back on warmer days, though. I think this is more related to the engine than exhaust, perhaps affected by the richer fuel mixture when it’s cold.

 

[Sjp45066]

Same here. The noise has completely disappeared during the colder months. I have heard it come back on warmer days, though. I think this is more related to the engine than exhaust, perhaps affected by the richer fuel mixture when it’s cold.

 

[Sjp45066]

Well... my dealership has been wstill no resolution. The last time they had my car for 2weeks checking things, but GM would not allow them to fix anything because they already replaced my exhaust.
When leaving the dealership I was pretty much told “gm says it’s normal” but the service manager seems to agree with me... it should not be normal, or tolerated.
I was told I could take it to a muffler shop and have the passive exhaust valve cut out, and weld back together, or by an aftermarket exhaust to put in. I do not feel it’s my responsibility to do any of that when they will not confirm that that is causing the noise.
My Denali is going back to the dealership next week for the 4th time, but this time they are having an Engineer from GM come to the dealership to work on it. So... I will update again when I get it back...

Did you ever get this resolved?

 

[Adam10532]

Picked up a 2017 Denali just over a month ago, been hearing a "fluttering"/rattling type sound when accelerating. I'd say it usually happens at about 1500-1700 RPM... occurs when you're asking for a little more speed and usually stops when at cruising speed.

Dealer said it's the sound of some exhaust valve with the purpose of keeping the muffler quiet... is this normal? Seems too loud to be normal. Video attached.

 

[Adam10532]

I have the same problem my 2016 Yukon Denali XL it all started when the dealer had to replace a fuel injector and FYI I got rid of that exhaust valve because I put a magnaflow muffler and I still have the noise that you just had right there so I don't believe it to be that exhaust valve I don't even have one and I have that noise I believe it to be an exhaust leak

 

[TMBB]

I have the same problem my 2016 Yukon Denali XL it all started when the dealer had to replace a fuel injector and FYI I got rid of that exhaust valve because I put a magnaflow muffler and I still have the noise that you just had right there so I don't believe it to be that exhaust valve I don't even have one and I have that noise I believe it to be an exhaust leak

HAS ANYONE FOUND A SOLUTION TO THIS NOISE YET?!? 2017 Tahoe with the EXACT same issues. And I rented one that had the noise as well! Took it to dealer and they pretended they couldn’t hear anything....

 

[sb312]

PIP5570A. Print, bring it to your dealer and ask them to replace the seal. I’m having them replace mine for the same noise next week, will update with results. I added some dielectric grease and a large zip tie per the thread linked below and it quieted the noise down a lot. Hoping new seal kills it completely.

https://www.gm-trucks.com/forums/topic/188701-engine-tick-2015-gmc-sierra-53/?page=38