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Duramax Sixth Generation: 2017-2019 (L5P) Discuss the sixth generation of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 11-09-2019, 11:09 PM   #1 (permalink)
D.Camilleri
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Regens

A problem comes up randomly and I am curious if anyone knows which sensors to watch to see what the possible cause is.
Truck is a 2017 L5P with 42k . The other day when I parked the truck at work my soot level was 44% as read by my Banks Idash. When I left work, I let the engine warm up for about 10 minutes and when I got into the truck my soot level was at 102% and the truck went into regen. It completed the regen in about 15 minutes. This same thing has happened several other times and there is no rhyme or reason. Is this caused by a faulty exhaust system sensor?

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Old 11-10-2019, 08:52 AM   #2 (permalink)
powerhaulic
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You probably don't have any issues, you are not looking at the countdown to regen which can and will occur well before filter reaches 100.
Once regen starts count you are viewing goes to 100 then a bit higher before it starts to come down, doesn't start to come down until exhaust temp sensor #5 reads in the 800deg range.

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Old 11-10-2019, 12:52 PM   #3 (permalink)
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Quote:
Originally Posted by powerhaulic View Post
You probably don't have any issues, you are not looking at the countdown to regen which can and will occur well before filter reaches 100.
Once regen starts count you are viewing goes to 100 then a bit higher before it starts to come down, doesn't start to come down until exhaust temp sensor #5 reads in the 800deg range.
I guess what I am trying to learn is the logic the ecm uses to determine soot load. How can the soot load change from 44% to 100% by simply turning the engine off and then restarting hours later. A normal customer would never know this was happening, but gear heads that watch gauges see some stuff that other people will never know, including techs that work on these day in a day out. Earlier this year I also saw my EGT sensor get stuck and didn't respond. Several key cycles and it started working and has never had the issue re occur.
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Old 11-11-2019, 05:22 AM   #4 (permalink)
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I to have seen my 2019 2500 High Country do the same thing...2-3 times already...and usually just does a fast Regen and is done....
I guess it's the way it's programed...

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Old 11-11-2019, 09:26 AM   #5 (permalink)
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Quote:
Originally Posted by D.Camilleri View Post
I guess what I am trying to learn is the logic the ecm uses to determine soot load. How can the soot load change from 44% to 100% by simply turning the engine off and then restarting hours later. A normal customer would never know this was happening, but gear heads that watch gauges see some stuff that other people will never know, including techs that work on these day in a day out. Earlier this year I also saw my EGT sensor get stuck and didn't respond. Several key cycles and it started working and has never had the issue re occur.
The soot load only changed because it started a regen, As soon as regen begins the soot load goes to 100 then a bit more till the DPF comes to temp. then begins to count down.
The EGT sensors are known for failure, replaced mine @ 18k on the '18. (warranty)
Look in gauge selection on your Idash, there is another pid to see the count till regen. I monitor both. On the '18 regent count would get to 100 but filter load would usually be in the 40-80 range.
My 2020 acts completely different, regens are at the shortest 352 all city miles, but average 700mi if a bit more highway driving is included.
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Old 11-16-2019, 02:45 PM   #6 (permalink)
Rod in MN
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Regens

Hi Guy's I have a 2016 Duramax 3200 HD This may sound dumb but how do yon know when the engine goes into a Regen ???

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Old 11-16-2019, 05:10 PM   #7 (permalink)
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Search “regen” Or “regens” and read for days.

If you haven’t noticed it yet, don’t worry about it. There’s no reason to know or keep track of when it regens, and once you realized when it’s doing it you will start to track it and wonder why it’s happening, worry about it, etc. In this case, ignorance truly is bliss.
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Old 11-18-2019, 01:25 AM   #8 (permalink)
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Where is code listed for countdown to Regen for the iDash 8?
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Old 11-18-2019, 08:44 AM   #9 (permalink)
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Quote:
Originally Posted by Rod in MN View Post
Hi Guy's I have a 2016 Duramax 3200 HD This may sound dumb but how do yon know when the engine goes into a Regen ??
There isn't anything that comes stock on the truck to notify you of a regen.
There's no light or message, but there are some "tells."
A) The truck idles at a higher rpm during regen
B) If you monitor MPG's regularly throughout a tank of fuel, you'll notice a MPG drop.
C) The sound of the engine is slightly different under accelleration
D) There's an occasional burning rubber smell when you park the truck in the middle of a regen.
E) For some, the digital compass "locks" during regen, but I think this has been resolve in later trucks
There are some messages you will get.
You only get a DIC msg "Clean Exhaust System/Filter" if youre driving the truck in a manner that doesnt allow effective cleaning.

You can get a CTS Insight monitor for gauges and it will notify you when the truck is in Regen.

Last edited by Rvn4me; 11-18-2019 at 08:51 AM.
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Old 11-18-2019, 08:56 AM   #10 (permalink)
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Quote:
Originally Posted by RDP View Post
Where is code listed for countdown to Regen for the iDash 8?
Maybe watching one of these will let you know when regen will happen soon. DPF, SL, DPF RG, PM 1
https://shop-banks.s3.amazonaws.com/...5P_DURAMAX.pdf


Last edited by Rvn4me; 11-18-2019 at 09:05 AM.
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