Regen?

Njmurvin · September 9, 2020

I apologize if this is dumb question. I'm not new to diesels but I am new to the emissions related features (all my 04.5 Dodge Ram had was a catalytic converter). How do I know when a regen is happening? I have just over 1000 miles on the truck and I am assuming I've gone through at least one regen by now. Is there a simple way to know when it happens?

dab5577 · September 10, 2020

Without adding a programmer or something the only way to tell on the L5P is getting out and noticing the smell of the exhaust at extreme temps or watching your fuel mileage take a big dip.

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unit · September 10, 2020

Regens are pretty much imperceptible by the driver most of the time. You may occasionally notice a drop in instantaneous fuel mileage or smell the odor hot pipes give off but that's about it. I have a Banks iDash gauge that can show the soot level in the DPF and show when cleaning is taking place but I don't pay much attention to it most of the time. You'll get a message on the dash if there is ever a problem.

Edited September 10, 2020 by unit
Added wording.

Njmurvin · September 10, 2020

OK. Thanks. Good to know.

kylant · September 11, 2020

i think I had my first regen yesterday at about 480 miles. the truck way ideling a touch faster and there was a distinct smell coming from it. it smelt like burning bread, not the awful burning plastic type smell my other diesels make when they go through the process

Colossus · September 12, 2020

Yup, that was your first regen.

ahartzell2020 · February 14, 2021

I feel like my duramax has mini regens and full regens lol.

4-5 times since owning the truck I’ve noticed what’s described above: odd burning smell.

2 times I’ve noticed what I think is a true regen: drop in power, drop in MPG, and when I get on the accelerator during this, it sounds like an f16 is in my truck bed.

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redwngr · February 14, 2021

1 hour ago, ahartzell2020 said:

I feel like my duramax has mini regens and full regens lol.

4-5 times since owning the truck I’ve noticed what’s described above: odd burning smell.

2 times I’ve noticed what I think is a true regen: drop in power, drop in MPG, and when I get on the accelerator during this, it sounds like an f16 is in my truck bed.

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Shouldn't change power.

There is an extra fuel injector in the exhaust (after the turbo) that supplies the fuel for the heat for regen.

Yes it will drop the fuel economy during the approx 20 miles it takes for regen.

Yes the exhaust will sound different.

Not sure how new your ride is, but the smell from grease/oil/coatings burning off exhaust components should disappear over time.

Colossus · February 14, 2021

actually I too feel like my Duramax has a bit more kick in the pants feel to it when it's doing a regen.

ahartzell2020 · February 14, 2021

Shouldn't change power.
There is an extra fuel injector in the exhaust (after the turbo) that supplies the fuel for the heat for regen.

Yes it will drop the fuel economy during the approx 20 miles it takes for regen.
Yes the exhaust will sound different.

Not sure how new your ride is, but the smell from grease/oil/coatings burning off exhaust components should disappear over time.

Had about 8mo and only about 6,000 miles on it.

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redwngr · February 14, 2021

10 hours ago, ahartzell2020 said:

Had about 8mo and only about 6,000 miles on it.

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It may have an exhaust leak if it still smells on occasion.

Or leak in fuel supply to/at the 9th injector -- if any gets on outside of the exhaust it will smolder/smoke/smell. Early LML's sometimes got a leak at the exhaust joint after the 9th injector and then smoke during regen. There were many many pages of posts/threads about this on the dmax forums.

Edited February 14, 2021 by redwngr

ahartzell2020 · February 14, 2021

It may have an exhaust leak if it still smells on occasion.
Or leak in fuel supply to/at the 9th injector -- if any gets on outside of the exhaust it will smolder/smoke/smell. Early LML's sometimes got a leak at the exhaust joint after the 9th injector and then smoke during regen. There were many many pages of posts/threads about this on the dmax forums.

How would I be able to tell short of taking to dealer?

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