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Duramax Seventh Generation: 2020+ (L5P) Discuss the seventh generation of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 03-26-2020, 02:03 AM   #111 (permalink)
Climber4
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Count me as another new owner of a thumping 2020 Duramax, with about 650 miles total. Shortly after noticing the thumping at idle, I Googled it and discovered this forum. I listened to recordings posted here and they sound identical to mine. I was was relieved to learn that GM claims there’s no short or long term effects on engine, disappointed there’s no fix yet to eliminate the thumping. Tonight after warming up the engine I did the belt removal check and sure enough, the thumping sound disappeared. Reinstalled the belt and the sound returned. Belt looks good and has no discernible seams, lumps or other defects. Pulleys look good too, and the grooves are clean. Tensioner and fan clutch don’t feel abnormal. The tensioner has a smaller pulley so I would think the frequency of the noise would be higher than it is if it was the culprit, and the thump does seem to occur once per engine revolution. So I don’t think it’s coming from the tensioner pulley.

I did notice there is wiring going to the fan clutch, probably to lock it up when extra cooling is needed. What if whatever controls that is sending a pulse to it every revolution? I’m curious whether pulling that plug would eliminate the noise. Has anyone already tried this? Post up if you do try it please. If no one else tries this by tomorrow night then I’ll give it a try.

I’m just brainstorming here and am pretty baffled so far. But I’m determined to figure it out.

So who will solve this puzzle first...GM or us? Please keep us updated if you discover anything new, and thanks for posting this info.

Even with this annoying thump I still love my new truck! It’s a real pleasure to drive and to tow with.

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Old 03-26-2020, 06:59 AM   #112 (permalink)
Rvn4me
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Originally Posted by Climber4 View Post
Tonight after warming up the engine I did the belt removal check and sure enough, the thumping sound disappeared. Reinstalled the belt and the sound returned.
Document ID 2128069
https://www.dieselplace.com/forum/at...elt-rumble.pdf

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Old 03-26-2020, 09:57 PM   #113 (permalink)
Gnewman
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Quote:
Originally Posted by Climber4 View Post
So who will solve this puzzle first...GM or us? Please keep us updated if you discover anything new, and thanks for posting this info.

Even with this annoying thump I still love my new truck! Itís a real pleasure to drive and to tow with.
Sorry to hear you have the same problem as many of us that purchased a 2020 GM, Duramax equipped truck. My first concern is that I brought this issue to GMís attention in November 2019, obviously they down played the issue with bulletins as presented numerous times in this thread but continued to sell the trucks with the defect to new customers. I love that you are looking for a solution to solve the problem, but wouldnít you think itís a fair expectation considering the price we all paid for these new trucks that GM would want to resolve this?

Hope all of you and your families are safe and healthy!
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Last edited by OkDually; 03-26-2020 at 10:04 PM. Reason: repaired quote
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Old Yesterday, 02:44 PM   #114 (permalink)
Climber4
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Quote:
Originally Posted by Gnewman View Post
Quote:
Originally Posted by Climber4 View Post
So who will solve this puzzle first...GM or us? Please keep us updated if you discover anything new, and thanks for posting this info.

Even with this annoying thump I still love my new truck! It’s a real pleasure to drive and to tow with.
Sorry to hear you have the same problem as many of us that purchased a 2020 GM, Duramax equipped truck. My first concern is that I brought this issue to GM’s attention in November 2019, obviously they down played the issue with bulletins as presented numerous times in this thread but continued to sell the trucks with the defect to new customers. I love that you are looking for a solution to solve the problem, but wouldn’t you think it’s a fair expectation considering the price we all paid for these new trucks that GM would want to resolve this?

Hope all of you and your families are safe and healthy!
Yep! That’s a fair expectation for sure. I hope they’re serious about trying to figure it out.
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Old Today, 03:12 PM   #115 (permalink)
budvoss
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This is unreal,I traded in a 19 high country because of injectior problems and now i hear the thumping you all are experiencing at 200 miles lol... Oh well
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Old Today, 11:05 PM   #116 (permalink)
zwhite97
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I bought my wife's 2017 Tahoe with 24K miles on it and it has made this sound since the day I brought it home. I've always been curious about it.
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