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21 hours ago, KB Chevy said:

This is my 5th diesel and none have ever sounded like this with the loud knock, and my 2020 does. I can't believe they changed anything from 2019 to 2020 that would cause this obnoxious knocking sound.

Didn't they have to change the back of the engine to accommodate the new 10 speed transmission? Doesn't seem like enough to create a knock like that but that is one major thing they changed. 

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1 hour ago, MN6.2 said:

Didn't they have to change the back of the engine to accommodate the new 10 speed transmission? Doesn't seem like enough to create a knock like that but that is one major thing they changed. 

That could be a contributing factor, thank you for the info.

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On ‎10‎/‎28‎/‎2019 at 11:34 PM, bass mechanic said:

honestly i dont think for as long as this engine has been around this is a problem sound. diesels are noisy! if it was rod knock it would get louder with RPM and likely get worse under load.

and the fact others have the exact same sound, im sure any dealer will tell me its normal. ill wait till something bad happens and have it covered under warranty.

 

I watched your youtube upload and the ones you sent.  The youtube one I heard it most I think.  That deep "da da da da da da da da da da da da" thumping sound I assume is the one?  I went to some 2020's we have but they have zero miles on them and didn't have a similar thumping sound.  I can definitely hear the DEF injector tick in park that hits about every 1-1.5 seconds.   

 

5 hours ago, MN6.2 said:

Didn't they have to change the back of the engine to accommodate the new 10 speed transmission? Doesn't seem like enough to create a knock like that but that is one major thing they changed. 

 

No.  Same rear flywheel housing on the back 2017-2020.  

Edited by newdude

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1 hour ago, newdude said:

 

I watched your youtube upload and the ones you sent.  The youtube one I heard it most I think.  That deep "da da da da da da da da da da da da" thumping sound I assume is the one?  I went to some 2020's we have but they have zero miles on them and didn't have a similar thumping sound.  I can definitely hear the DEF injector tick in park that hits about every 1-1.5 seconds.   

 

 

No.  Same rear flywheel housing on the back 2017-2020.  

Yes it's a deeper thumping sound that is heard. It's harder to get it on an audio file to hear the true sound but it sounds like you can hear it. In person it's very noticeable. Yes i hear the injector tick which you can hear on all diesels and I actually like it. LOL The thumping is obnoxious, I own a RV dealership and my service manager was a Chevrolet service manager for years and worked at the Chevy dealership for over 20 years in different capacities. She stills has connections with the GM reps and has a call into him about it. She's never heard a diesel motor sound like this so not sure what to make of it. The warranty will cover anything that goes wrong but for 77k you would think it wouldn't sound like it does. Also this is my 5 diesel and when i was in the waste business we had 100+ diesel trucks, most large trucks but again I've never heard a diesel sound like this and not have an issue. Thank you for your time, I greatly appreciate your help! Please keep me posted if you should hear any info on this. 

 

Kenny 

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On 10/28/2019 at 10:09 PM, bass mechanic said:

heres a video with the sounds

 

I have the same thing. it sound like shit when you hear it.

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My 2017 had a knock you could hear while slowing to a stop, 2020 does it too.  Knock knock sound then goes away once stopped.  Had no issues with the 2017 

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17 hours ago, GPMS said:

I have the same thing. it sound like shit when you hear it.

Yes that's the exact sound. I had a GM rep come and listen to it and he said that's how they sound now but to confirm it he called a GM engineer who did confirm it. Said the motors are quieter in some aspects now and some sounds like the thumping/knocking are more pronounced. I find it very annoying but not much I can do about it. 

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Mine has the same noise. Call me weird, but this sound did not bother me at all and i love how this engine sounds as a whole. I think the deeper noises are much less annoying then the higher pitched of the old. It is subjective though.

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Great video, mine has the same sound. Dealer said it was noise from the egr system and naturally they say it's normal. Hope someone can figure out what it is.

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