2020 duramax - Page 2 - Chevy and GMC Duramax Diesel Forum
2020+ GM T1 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 15 (permalink) Old 12-29-2019, 03:00 PM
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Igniters in the afterburner maybe.
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post #12 of 15 (permalink) Old 12-29-2019, 03:17 PM
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Originally Posted by offtheshelf View Post
I purchased a 2020 2500 Silverado a couple of weeks ago, and had this same issue. Dealer had 72 hour or 300 mile or less return policy, so I took it back and got another one. This truck ended up with the same thumping noise. I was told it was normal, but I have also had several duramax diesels, and none of them made this noise. It sucks you pay the kind of money you do for these trucks, and no-one has the same answer. I have it set up to take to other dealership. I will keep everyone posted of what they find.
Any updates?
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post #13 of 15 (permalink) Old 12-29-2019, 04:30 PM
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You should not run Amsoil till engine is broken in like 10,000 miles

To many vehicles to little time! New LP5 owner first 2017 GMC Denali Duramax
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post #14 of 15 (permalink) Old 01-17-2020, 05:27 PM
 
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Recall?🙏🏻🤞🙏&#x1f3f b;
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post #15 of 15 (permalink) Old 01-17-2020, 06:35 PM
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You should not run Amsoil till engine is broken in like 10,000 miles
LOL You are so far in the weeds on that comment you cannot see out. This is not 1980 lol!

2020 GMC Denali 2500
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