Whats up Duramax'ers? I have 600 miles on my 2020 GMC LP5. Driving home yesterday, I noticed a familiar smell of a Duramax in re-gen. The thing that has me scratching my head is the fact that I did not notice the engine idle up. My previous LML would have a noticeable high idle when in re-gen, but I did not see this on my tach or notice any difference during idle. Today, driving to work the engine produced the same smell (oil/rubber) so I am under the impression the truck is in re-gen mode. Maybe I did not pay attention, but what should the RPM's be when in re-gen and when not in re-gen? I also checked for oil leaks or debris that may have landed on the exhaust.
when not in regen mine idles at ~700 when in regen I am at ~850. you will also see a noticeable depreciation in your instantaneous mileage.
Thanks for the info. With my LML, the idle was very noticeable along with the exhaust note when it was in regen mode. This new LP5, I have not noticed the idle speed increase. In fact, it seems like normal engine idle. If this is the new regen idle speed for the LP5, then I am impressed because it is not noticeable. I just wish GM would include something like a page in the info screen that would let you know. Other then that, I am just driving and enjoying her plus it has a warranty if it has any issues.
I've definitely noticed the same thing on my 2020. I have 11k miles and I've never seen the elevated idle during a regen like on all my previous L5P trucks. This truck seems to be a little more subtle when performing a mobile regen.
Sounds to me like it's a good thing and nothing to complain about. I hate it when my 19 regens. If I'm going down the road, I couldn't care less. But if I'm driving around in stop and go, the higher idle annoys me a little.
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Mine finally did it's first regen yesterday at around 900 miles. I could tell from the smell and the drop in gas mileage. But my rpm's didn't seem to kick up like in my lml either. I was idling at around 600 rpm during the regen. I did notice that the process seemed to take less time than the lml which was nice.
I’m NOOB to the Duramax word. I own a 2020 Chevy 2500 DMAX. I have noticed the smell a few times and checked for fluid leaks and couldn’t find a thing. Reading this makes me feel better now 😅
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