2021 Silverado 1500 6.2L downshift chirp/squeak

[Skipit79]

I just bought a new 2021 1500 with the 6.2L.  When driving around town approaching stops, when the truck downshifts into 1st gear approaching the stop the truck will make this chirping/squaking noise upon stopping the vehicle.  I can also hear it randomly occur starting and slowing down with in town driving as well.  Appears to come from the front mid section of the vehicle, maybe exhaust or transmission.  Has anyone heard of this problem?  Truck only has 600 miles on it.

[Liquid Plumber AT4]

On 7/29/2021 at 3:06 PM, Skipit79 said:

I just bought a new 2021 1500 with the 6.2L.  When driving around town approaching stops, when the truck downshifts into 1st gear approaching the stop the truck will make this chirping/squaking noise upon stopping the vehicle.  I can also hear it randomly occur starting and slowing down with in town driving as well.  Appears to come from the front mid section of the vehicle, maybe exhaust or transmission.  Has anyone heard of this problem?  Truck only has 600 miles on it.

Yep,seems to be a thing on all of these new trucks with the DFM.....put it in "L" mode on the shifter and bump the shifter "+" up to like L7 and drive around to see if that sound stops, mine did. Got this idea from another member here on the gm forum. When you have it in L shift mode it shuts off the DFM and that sound seems to stop. I had mine into the dealership for the chirp sound and they refused to acknowledge it.....they know it's this bullshi* DFM causing it.

[Skipit79]

I tried your suggestion, it seems L7, L8 and L9 eliminate the chirping noise.  L10 chirping noise is still there.  Thanks for the tip!

[19 Denali ultimate]

Spoiler

 

I wonder if what you are hearing is the stupid flappers in the exhaust pre and post muffler.  I had those and the muffler cut out when I went with a different muffler so I don't get that, but have seen some people post that is what the noise was on theirs.

[Graphite1500]

Very similar sound. This is what the techs noted.. 

 

2021 silverado 1500 6.2L with 300 miles. Brand new

Edited November 5, 2021 by Graphite1500

[todd308]

Just curious if anyone has ever got this noise diagnosed/fixed?  My 21' seems to have the same noise, it also does it at autostart from a light, and cold start, and when downshifting at low speeds, seems like it's getting worse/louder as time goes on. 

[gtrain33]

Following... this is how mine sounds

 

[todd308]

Yep that sounds like it, mine has a little more "flutter" to it, but same thing, goes away after 20-30 seconds, but you can also hear it for a few seconds after a restart at a stop light, and if you are driving say in an alley or along a building you can hear it doing it when the truck downshifts at low speeds.   

 

I believe it has to be DFM related, if I run the truck in L-9 it goes away when shifting (it won't auto start/stop in L-9 so no testing that or cold startup).   It's also probably why GM can't/won't do anything about it and simply considers it "Normal Operation" 

[GMCustomerService]

On 7/12/2022 at 7:58 PM, gtrain33 said:

Following... this is how mine sounds

 

 

On 7/12/2022 at 10:38 PM, todd308 said:

Yep that sounds like it, mine has a little more "flutter" to it, but same thing, goes away after 20-30 seconds, but you can also hear it for a few seconds after a restart at a stop light, and if you are driving say in an alley or along a building you can hear it doing it when the truck downshifts at low speeds.   

 

I believe it has to be DFM related, if I run the truck in L-9 it goes away when shifting (it won't auto start/stop in L-9 so no testing that or cold startup).   It's also probably why GM can't/won't do anything about it and simply considers it "Normal Operation" 

This is certainly not what we like to hear gtrain33 and todd308.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: [Forum Username]/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
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[breed]

Did this ever get worked out?  Just bought a brand new GMC Sierra 1500 AT4 with the 6.2 .  Heard this right after I brought it home and started it in my garage.  Now, it's all I can hear!  

Took it to the dealer a couple days ago, they said they couldn't replicate it or hear it.  Does this mean we'll have imminent lifter issues?

[JoeyPottie]

On 7/12/2022 at 8:38 PM, todd308 said:

Yep that sounds like it, mine has a little more "flutter" to it, but same thing, goes away after 20-30 seconds, but you can also hear it for a few seconds after a restart at a stop light, and if you are driving say in an alley or along a building you can hear it doing it when the truck downshifts at low speeds.   

 

I believe it has to be DFM related, if I run the truck in L-9 it goes away when shifting (it won't auto start/stop in L-9 so no testing that or cold startup).   It's also probably why GM can't/won't do anything about it and simply considers it "Normal Operation" 

I have a 2022 trail boss with 3500K on it and it dose the same thing, had it to the dealer 4 times now and have put multiple complaints in to GM and basically told me to get bent as this is a normal noise, and its like that to make the truck sound more like a V8...HAHAHA.. they even put a new exhaust on it and it still did the same thing. this has to be the most annoying noise ever, and wish GM would step up and fix the problem...  if any one has any updates on how to fix that would be great.       

[JoeyPottie]

 

 

 

 

This is what GM customer care said to me, 

 

Thank you for your e-mail.

 

We appreciate the time you have taken to correspond with us and offer your concerns and comments. Your comments have been documented. 

In response to your concern with the noise on yo0ur vehicle that they told you that was normal. Reason is each pulse makes a tone, which combined with the other pulses forms a harmonic series. The same thing happens in all engines, but it's the irregular firing sequence that gives a big V8 its distinctive throbbing sound.

 

With regards to the heated/ventilated chips, there is no ETA yet available. Our teams have been working hard to find a solution to retrofit vehicles with these convenience features that our customers want to continue to enjoy. We are excited to confirm all vehicles covered by the previous announcement will be eligible for a retrofit process that will activate the operation of the heated and ventilated seat modules. This retrofit process will begin when parts become available and at no cost to you.  Once parts are available to begin the retrofit process, dealers and customers will be notified accordingly.  

The retrofit process began in late Q2 2022, and we understand that due to the scale of the number of vehicles impacted, this process may take some time to complete for all of the vehicles that require retrofit.  

Your dealership will contact you as soon as the parts are received, and will make arrangements to get your vehicle in for service.

 

 

Should you require future assistance, please contact us again through our website at www.gm.ca or call our Customer Care Centre, toll-free, 1-800-263-3777 or 1-800-263-7854 (French), Monday to Friday, 8:00am to 11:00pm, Saturdays, 8:00am to 5:00pm, Eastern Standard Time.

 

Thank you for contacting General Motors of Canada Company. Please visit our web site again

 

 

 

 

Regards,

 

Valerie

[todd308]

That's completely ridiculous, but not surprising, GM is clearly assuming you are a total idiot with such a response.   While I'm sure many parts are different, It would be interesting to see if this happens with the 6.2 Camero/Corvette.   The reality is unfortunately these noises seem "normal" for this Truck/Engine, however it's NOT normal for a new vehicle, and it doesn't change the fact that it sounds like it belongs in a junkyard when it cold starts, restarts at stop lights, and downshifts.  

 

 

[JoeyPottie]

100% agree! They need to fix the problem. 

[Brent Reed]

What if we got a class action together?  I have also played with switching into L9, and it doesn't make the sound when downshifting or pressing the accelerator at lower speeds.  It makes the sound when it starts though, even if you immediately shift into L9.  It's definitely DFM related and pathetic that our $70k brand new trucks sound like 1972 Chryslers when they start.

They know there's an issue, and are refusing to address it with consumers.  I've reached out to a law group who has previously won class action suits.

Edited September 19, 2022 by Brent Reed