There is no alternate software for city regens. And stop and go is bad for these new trucks. I'd suggest getting a Banks idash and set it up so you know when your getting close to a regen and can prepare accordingly. Not being able to complete regens will basically ruin the entire system. I assume also that the idash will have full functionality on the lm2. My wife's tdi never regened once and she never filled the def in 50k miles since the system wasn't even working, which was nice.

 

When doing “short drives” and hard acceleration, my 2017 will go into that “continue driving” state. I then take that as a time to take a nice drive in the country where I can stay above 45mph. Usually it is a 60-75 mph fairly straight stretch. I drive out 10 miles then home.. 20 mile loop.

it is not as bad now that I have 50k on it. Ran thru lots of the fluid… GM put the “patch” on and things improved significantly.

there is no other choice. The truck must regen… beatings will continue until morale improves, comrade.

There are aftermarket devices which do a “force” regen cycle. The dealers have method to force regens until warranty expires.

So, if you live “in the city”, find a way to do longer drives keeping the RPMs up. Like going into transmission manual mode … it makes drivability difficult for my wife, so I drive like that or take a country drive.

 

I drove mine 12hrs from Philly to home in Alabama at 75-80 with exhaust brake and tow mode on in manual! STILL DIDNT QUIT! I think the off brand store DEF I used a couple hours prior fucked my system up. Had to get home though!

 

Hmm -- wish I was aware of this before I bought the truck.

If the dealer just clears the code -- and we go on a "long drive" 20+ miles -- will the issue clear itself?

 

Only if your able to tell if it's in regen, which they don't tell you until the continue driving message shows up and then the failed regen message. You need a device like the idash or similar to let you know when a regen is about to occur. You can do a mobile or stationary. Your problems are really GMs fault for not properly educating customers on this system and also for making the system only notify the driver when there is already a problem.

 

Regens on the 3.0l (at least in a truck) last between 10 & 15 miles at highway speed. If you see the keep driving message drive it somewhere where you aren't stopping until it goes away. As mentioned a Banks iDash will allow you to force a mobile regen and it will also clear codes.

Jay

 

Take your family for ice cream about 20 mile ride… works for us..

 

Also look into the edge insight cts3. Does all the Regen monitoring and I think it looks way better and more customizable. It's what I use.

 

Just captured this video on my morning drive. I have an alert set for active regen. Highly recommend this product.

 

That's very cool. I've not bothered with Alerts in the banks gauge, but I'll look into them once I get home from my camping trip. Thanks for sharing!

 

I always volunteer for the long trips and have never seen that. Usually take a 30 mile (each-way) trip at least once a week. Mon-Fri I'm mostly driving in 5-10 mile increments. I also tow equipment with mine about every other week (10,000-20,000lbs) which helps. I have the 6.6, but if its not convenient for you to take longer trips every week or two, then maybe a gasser will suit you better.

 

More options, Torque Pro and an OBD scanner will do this as well. Check this guys video out, he goes thru a regen and explains what’s going on while you can see it, as well as some historical regen info.

 

Awesome video!!! Very cool.. need to watch on my big TV

 

I should have added in my previous post that doing the same (mostly rural 2 lane) daily driver type duty the '21 LM2 (3.0L) regens more frequently than the L5P (6.6L) -- but the length of regen is much shorter.

My L5P would take roughly 20 minutes / 20 miles on rural 2 lane.
LM2 only takes about 11-12 miles / minutes.

 

If you know you are in regen and don't have a long way to drive, just lock it in a lower gear and try to drive at a steady pace. The egt's will stay in the regen stage longer. For my 2018 L5P 4th gear and 45 mph works really fast.

I have the edge cts2and it will let you know it's about to start a regen by displaying a dpf heating message.

 

This definitely works. 5th gear and 65MPH is another good combo. No higher than 65 though, too much exhaust flows and starts to cool off the DPF.

 

I've not have any alerts setup on this one.
Alerts can be setup for parameters even if the item is not selected for display.

This iDash is set to use 'GM Standard' data points. Seems to work better than the LM2 set.
Currently it's logging about 32 items at 1hz. It can log about 100 (depending on the sample rate).

DPF SL is soot load in %
REGEN changes from OFF to ACT when regen is active
LSTRGN is miles since last regen -- I've found that the increase in DPF SL % is not linear, and the number displayed will also depend on exhaust system temperature.
(52% at 39 miles is not an indication that it is going to regen again at 78 miles.)

Take a bunch of miles for the engine oil temp to get to the 240 range.

Same with the two engine coolant temperature numbers.
Early in a drive, ECT2 seems to be about the same as the dash display and ECT seems to be running a bunch cooler than the dash display --- but when fully warmed up, ECT is close to the same as the dash, and ECT2 is in the range in the picture.

DEFLVL on the DIC indicator still has one LED above half turned on.

Green dot blinks to indicate that it is logging data.
fwiw, data selected for logging does not have to be the same as what is displayed.

 

I've not have any alerts setup on this one.
Alerts can be setup for parameters even if the item is not selected for display.

This iDash is set to use 'GM Standard' data points. Seems to work better than the LM2 set.
Currently it's logging about 32 items at 1hz. It can log about 100 (depending on the sample rate).

View attachment 1087414

DPF SL is soot load in %
REGEN changes from OFF to ACT when regen is active
LSTRGN is miles since last regen -- I've found that the increase in DPF SL % is not linear, and the number displayed will also depend on exhaust system temperature.
(52% at 39 miles is not an indication that it is going to regen again at 78 miles.)

Take a bunch of miles for the engine oil temp to get to the 240 range.

Same with the two engine coolant temperature numbers.
Early in a drive, ECT2 seems to be about the same as the dash display and ECT seems to be running a bunch cooler than the dash display --- but when fully warmed up, ECT is close to the same as the dash, and ECT2 is in the range in the picture.

DEFLVL on the DIC indicator still has one LED above half turned on.

Green dot blinks to indicate that it is logging data.
fwiw, data selected for logging does not have to be the same as what is displayed.

can you program with a computer connection or all pushing tiny buttons on the Banks?

 

Here is the alert I have for regen.

 

Thank you for the detailed information. I appreciate that!

 

I had a similar experience with a 2020 6.6L. I use a CTS2 to monitor soot levels. I was pulling a 5th wheel about 400 miles that day. Soot levels would go up and down between 75 and 85%. The next day the CEL was on when I started it. I took it to the dealer and they did a manual regen, soot level went to 0. Service manager said if it happened again I need a new cat.

Continued on trip towing about 350 miles a day. On the second day (500 miles since last regen) the soot levels got up to about 35%. Suddenly the truck went into regen and soot level reading jumped to 96%. The regen dropped the soot level about 2% every mile towing at 65 mph. Eventually the regen reduced the soot level to 0 and stopped.

Since then another 450 miles of towing and 200 miles of 80 mph driving has the soot level at 33% with it varying up and down 2% - 5% as I travel. I'm beginning to think that the truck might have a sensor or two that aren't working to spec.

 

Soot level varies a lot, and is not necessarily the thing to watch (at least for the L5P). DPF RGN trigger is the thing to watch. I don't know if the Edge products monitor the DPF RGN parameter. The banks iDash does.
From what you've described with the second half of your post, your truck sounds normal. The first part with the CEL, I can't explain that. What was the actual code that tripped the CEL?

FYI...read this sticky, and both GM techlink articles. They will help you understand the difference between soot load and the regen trigger...

Definitive L5P Regen thread

I am sick of rumors, guesses, theories and flat out wild ass guess as to what goes on with these vehicles... the techs around here giving excuses as to why they can't post actual info because it would put their jobs in jeopardy etc... So here is what GM says about Regens on the L5P platform...

www.duramaxforum.com

 

My CTS3 does monitor the dpf Regen trigger. It is under the advanced pid's and is called normalized Regen %.

Viper is correct. This is the one to watch. Mine will go slowly up to 100% and then when it hits 100, the soot level jumps up to 100 and a Regen begins.

 

I ignore soot level until regen starts. When I see the trigger hit 100, I switch iDash pages to a page with soot level and all the EGTS. As mentioned, when regen starts, the soot level jumps to 100 and starts counting down once the EGTs get high enough. SL does give you a good indication of how much longer you will be in regen.

 

In datalogs on LM2 with iDash set to 'GM standard' shows that when not in regen the 'DPF Regen Trigger' and 'DPF Soot Load Percent' display the same value (+/- 1), but the 'trigger' one displays one decimal place and the 'soot' one just show no decimal places.


Regen starts when 100 is reached. The 'trigger' value stays at 100 (until regen completes), but the soot load reduces at soot is burned off.
When the regen completes, the regen trigger value changes to the same value as the 'soot load'.


'Miles since last regen' measures miles since the last regen completed.
It changes based on when regen completes, not base on when regen starts.

 

Hey all,

I am a relatively new owner. I bought my wife a 2021 Yukon Denali 3.0L Duramax and we love it as our family truckster. It gets good mileage, great torque, etc. This is not my first diesel (I had several VW and Audi diesels previously). So I am familiar with the regen process, use of DEF, etc.

While we use our truck for long drives, it mostly is mostly a grocery getter and kid taxi around our town -- with lots of short trips and start/stop traffic. At around 3500 miles my wife got the "Cleaning Exhaust Filter Keep Driving" message. As she was making her normal series of short trips -- she drove as she normally did and I assume cut off the regen process when we keyed off the Yukon.

The truck then threw a CEL. I checked and topped off the DEF tank (which was down to a 1/4 tank) using 2.5G of ISO/API certified DEF. And we took the truck to the dealership - and they just phoned that the CEL was in fact because the DPF was not able to properly regenerating. They have a call into GM's tech line -- and they are hoping that there is a software fix, but the dealership admits they are puzzled (and they want to keep the truck overnight).

We can't be the first and only to have this happen on this product (I know its new -- but we aren't the only ones that use their Yukon for arround the town driving). I have never had this issue with the 3.0L TDI product from VW/Audi.

But has anyone else had this issue? Anyone have a work around? I know we cannot force a manual regen -- but is there some option here? Does GM have a software flash for this truck for drivers that use their Yukon for short trips?

ProductsIts Made in Mexico. I Loved my GM Products. Though they are built like crap. I sneezed on my 2018 HD2500 Silverado. it dented. Peolpe with 2021's all the control arms are rusted .No Paint on them. Build them in Mexico ( CHEAP) and sell for $80,000.00. They are JUNK . Sorry. 😬

 

Remind me if the Edge or Banks allows you to start a regen cycle on the fly?

 

Banks does, unsure on Edge.

 

Ah, yes 8 total. I was going from memory. I didn't think to scroll up to the picture above.

I tend to run with 7 as you can see in the video I posted. I've been messing with it for the couple months I've had it, trying different monitors that seem useful. I kinda like the big "Regen" at the top.

 

Thanks viper8315. The thread you referenced explains a lot. I'm not sure that the CTS2 has the regen % PID. If not I see a CTS3 in my future. The truck did another successful regen yesterday. I watched the soot level carefully, both before and after the regen. It posted nonsensical numbers throughout the whole process. That's understandable given that the number is being guessed at by measuring related engine parameters rather than a direct measurement.

Unfortunately I didn't ask for the code that tripped the CEL. My whole focus at the time was not ending up stuck in the middle of Oklahoma 2,000 miles from my destination.

 

The lock shows that your torque converter is locked up. It goes away when unlocked.

 

On my LM2 it never goes away.

When torque converter is 'locked' it shows a locked lock.
When torque converter is 'unlocked' it shows an unlocked lock.

 

Yikes! That's the service regen. Don't do that one unless it's the last resort. Like you have active codes and suspect the DPF is clogged up.

In the same menu, there should be an option for "mobile regeneration". Pick that one, and go for a drive. A special note here, on the big Duramax, activating mobile regeneration actually occurs on the next key cycle. So you may have to shut the truck off, and start it back up before the mobile regen will start.

 

Yikes! That's the service regen. Don't do that one unless it's the last resort. Like you have active codes and suspect the DPF is clogged up.

In the same menu, there should be an option for "mobile regeneration". Pick that one, and go for a drive. A special note here, on the big Duramax, activating mobile regeneration actually occurs on the next key cycle. So you may have to shut the truck off, and start it back up before the mobile regen will start.

No issues enabling mobile regen while on the go or sitting at a light with the idash.