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Discussion Starter · #1 ·
I have a 2021 Yukon Denali w/ Duramax 3.0. It also chug, chug, chugs at Key-Off. The exhaust becomes loud intermittently, usually after exiting the highway. It can be annoyingly loud when idling through a parking lot. It can go away; or last until I start it the next morning. Has anyone ever experienced this issue?
 

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I've heard a throatier growl from time to time but nothing I'd call loud. May be due to the EGR opening but I don't know. Been watching the EGR opening on my idash lately. Seems to open more during a coasting idle than anywhere else especially coming off the highway. But these trucks a damn quiet across the board, even towing.
 
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