Another regen question
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More Turbo
Joined: Dec 2004
Posts: 527
Likes: 6
From: Jamestown Tn
I drove to work today DPF said "FULL" . Driving to work is 30 miles on the interstate for me. So i had it on cruise doing 60 watched the MPG it was around 13-14 switched back to the DPF screen and it started to go down 5% at a time. By the time I got to work it went to 0% So i will assume now it will trigger at 100% or mileage whichever comes first. I wanted the screen activated to know when to let the truck idle a little bit before shut down if it was in a regen that was my main purpose. Now i know thanks for the replies Jeff
Mountain Pass
Joined: Nov 2019
Posts: 176
Likes: 22
FYI, I monitor all of this on a Banks IDash. For some reason, my DPF soot level goes (usually) slightly above 100% (104 or 105) before regen starts. One time I noticed the regen start at soot level in the 90’s. I don’t pretend to know all the variables at play or the algorithm used to start the regen. Could it be the IDash not reporting the correct parameter?
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
Idash is fine. It has to do with the computing of the soot % that banks uses vs the factory. They both arrive at the same point when the active regen hits according to the truck and the monitor.
FTE Legend
Joined: Mar 2017
Posts: 31,967
Likes: 9,197
From: Western NY
I've seen guys here say that they have consistent regen cycles but I certainly do not. I've had mine go over 100% when I used my EB on two hills that I go up and down depending on when I was going down each to slow the truck. Now I'd rather have the soot load lower and replace the brakes sooner so I don't use it anymore. It stays under 100% for me, usually 40ish to 60ish or so. My regens for the most part are over 400, usually 430 to close to 500. I've had the truck go over 500 when on road trips in Kentucky with the hilly highways. While you have the DPF screen enabled, IMHO it's nice having a digital monitor to see what's going on.
Mountain Pass
Joined: Feb 2013
Posts: 146
Likes: 21
The PCM/ECM determines when to do the regen based on many factors and not just miles since last regen or DPF is 100%. If you are towing, your truck might be doing passive regen. This happens when the EGT4/EGT14 exceeds 750*-775* F. The DPF exceeding these temps will burn off some of the particulates. The truck exhaust screen might show only 50% or 75% or any % below 100% when the active regen starts.
Just because you have exhaust filter screen activate, you might not be able to do a manual regen. I would drive the truck normally and let the PCM/ECM determine when to do the regen. I am not sure about the 17-19 trucks if you have the ability to do a manual regen or not once you activate the exhaust filter screen. I know that the 13-16 trucks you can't. Most use a monitor or tuner to do the manual regen. I know with the Edge CTS/CTS2, I can do a manual regen if needed.
The only time I would consider a manual regen is when you can not achieve the required mph for a regen to start. This could be a situation when you are towing in the mountains and receive the message "Drive to clean". At this time I would consider pulling over and doing a manual regen.
For the most part, stop worrying about the percentage shown on the exhaust filter screen. Drive the truck normally. Even if a regen starts and can't fully complete, do not worry. Some owners try to plan a drive that allows the regen to finish but most of us do not worry. Again, drive the truck normally and let the PCM/ECM do the worrying for you on when to do a regen.
Just because you have exhaust filter screen activate, you might not be able to do a manual regen. I would drive the truck normally and let the PCM/ECM determine when to do the regen. I am not sure about the 17-19 trucks if you have the ability to do a manual regen or not once you activate the exhaust filter screen. I know that the 13-16 trucks you can't. Most use a monitor or tuner to do the manual regen. I know with the Edge CTS/CTS2, I can do a manual regen if needed.
The only time I would consider a manual regen is when you can not achieve the required mph for a regen to start. This could be a situation when you are towing in the mountains and receive the message "Drive to clean". At this time I would consider pulling over and doing a manual regen.
For the most part, stop worrying about the percentage shown on the exhaust filter screen. Drive the truck normally. Even if a regen starts and can't fully complete, do not worry. Some owners try to plan a drive that allows the regen to finish but most of us do not worry. Again, drive the truck normally and let the PCM/ECM do the worrying for you on when to do a regen.
FTE Legend
Joined: Mar 2017
Posts: 31,967
Likes: 9,197
From: Western NY
This is interesting to me, although I guess I understand that it takes a minimum temperature to burn off soot. I had a chance to create the right conditions for a passive regen last week, I hooked up ~8000lb trailer and purposely chose the highway route to my destination approx 30 miles. I monitored 4 egt sensors via EZ-lynk but at no time during the trip did #4 get near or sustain 750*. Sensor #1 would briefly get that high under acceleration but that's it. Apparently I need to be pulling more weight for this to happen
Mountain Pass
Joined: Feb 2013
Posts: 146
Likes: 21
No, I do not have the ghost screen activated(yet) but my Ez-Lynk does monitor soot load which is what I was watching. BUT I don't think its properly displaying soot load because it reads in a range of 0-3 g/l. Once it hits 3 I start a regen and when its finished it will read 0-1. I have been in contact with EZ-lynk about this and they are checking into it.
So I suppose its possible that it did burn off some soot and I wasn't able to observe it.
So I suppose its possible that it did burn off some soot and I wasn't able to observe it.
FTE Legend
Joined: Mar 2017
Posts: 31,967
Likes: 9,197
From: Western NY
Oh okay. Those Edge monitors use the grams per liter PIDS also. So did you see any reduction in the g/Ls at all at those temps while towing? I use my iDash 1.8 to monitor soot load % as I don't have my DPF screen enabled but will so at who knows when. 
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Mountain Pass
Joined: Feb 2013
Posts: 146
Likes: 21
No I did not, it stayed the same for entire trip. But as I mentioned, I don't believe its displaying properly. I would expect the scale should be more than 0-3 g/L
What numbers do you typically see for g/L when you regen?
What numbers do you typically see for g/L when you regen?
FTE Legend
Joined: Mar 2017
Posts: 31,967
Likes: 9,197
From: Western NY
On the iDash, it's displayed as a percentage. I know Larry aka Just Strokin uses an Edge monitor. He's talked about this before. Maybe he'll chime in at one point. Or if not, send him a PM. He's a very helpful guy.
Tuned
Joined: Oct 2019
Posts: 362
Likes: 17
From: Lowcountry
@Overkill2 is this reading from your monitor or the truck display?
FTE Legend
Joined: Mar 2017
Posts: 31,967
Likes: 9,197
From: Western NY
@Overkill2 is this reading from your monitor or the truck display?
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 119
From: Tallassee, ALabama
If I shut off my truck once the CTS2 reaches 100%, it will blank out when I restart the truck prior to a regen. It will show 100% and decrease during a regen when the g/l approaches 2.80 g/l. Until then it will remain blank on the CTS2.
Once the DPF reaches 100%, the g/l will still increase whether the DPF % stays at 100% or blanks out. On my CTS2, once I reach approx 3,43-3.45 g/l, a regen will start.
Also, I noticed with the TorquePro app, the DPF % would go over 100% when I was using TorquePro to monitor my truck.
I do not pay much attention the the % Full of the DPF on the CTS2 as I do on the truck Exhaust Filter screen in the dash.