Regeneration Frequency Issue: MAF Poll

[mbarber84]

Trying to collect some data on the regeneration frequency issues. Based on all my research it sounds like the MAF (Mass Airflow Sensor) may be at the heart of many of these problems. There are, as far as I know, two different MAF sensors currently in circulation for these trucks. These can be identified by a series of letters on the sensor itself, as well as its country of origin which is also printed on the sensor. Both are easily identified by looking at the sensor from the outside of the air intake tube. From what I have gathered so far, these two sensors were installed starting in late-production 2021 and newer trucks. The two versions are:

“AARFN” produced in GERMANY

And

“ABMBV” produced in CHINA

If you have a 2021 or newer truck that is experiencing a regeneration frequency issue, I’d like to collect some data using the poll feature. Please fill out a response from the list of options provided. If you have additional information or comments, please include them as comments to this poll. These would include if you have had the MAF replaced as part of a diagnostic and repair procedure for a regeneration frequency issue. Thanks in advance for your input!

 

[AH64ID]

I have an AARFN and have not experienced regen issues, but my duty cycle is a lot of that reasoning. I suspect I would if I DD’d it more, but that’s just a hunch. So I’m not voting, just yet.

The MAF theory is sound, IMO, because I have seen some odd readings on the regen % PID especially at low rpms and low airflow.

That being said, I have nothing to compare it to.

 

[Riddick]

AARFN here and no issues. I have experienced frequent regenerations (every couple hundred miles) after swapping in a Wix filter. Since going back to OEM no regens outside of 24 hr automatic regen. Truck has 15k miles and I ran the Wix filter for 1k miles.

 

[blbrown]

What is normal or average for regens, I've been watching mine and haven't seen one for at least one if not two fill-up's
2020 2500 with 55000 miles, all recalls completed.

 

[mbarber84]

What is normal or average for regens, I've been watching mine and haven't seen one for at least one if not two fill-up's
2020 2500 with 55000 miles, all recalls completed.

If you’re going that long without a regeneration I would say you don’t have a problem. Assuming you don’t tow daily?

 

[blbrown]

If you’re going that long without a regeneration I would say you don’t have a problem. Assuming you don’t tow daily?

Don't tow that often, getting over 20mpg, 14mpg when towing 5th wheel. I did get a new dpf after the dealer install of the Y78 pump, due to them installing the boost tube poorly causing a tear in the rubber end of the tube. Was doing a re-gen about every 15 miles or so, until the dpf became completely clogged.

 

[Ionicbrick]

2022 3500 HO, has the AARFN sensor. I feel like I regen more often than it should, but not so much that I worry about it. I tow at least 5k every day, mixed, and it regens every 150 miles or so.


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[mbarber84]

2022 3500 HO, has the AARFN sensor. I feel like I regen more often than it should, but not so much that I worry about it. I tow at least 5k every day, mixed, and it regens every 150 miles or so.


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150 miles between Regen cycles is too often, especially if you’re regularly towing.

 

[superjoe83]

'22 3500 HO built May
AARFN
No regen issues so far, gauge has only once got to the 30ish% mark normally stays at zero or close to it, mixed driving with towing every month or so

 

[kfscoll]

2022 3500 SRW SO w/ the AARFN sensor, 20K miles, all recalls completed.

I'm pretty sure mine's regenerating too often...every 300-400 miles with mixed highway and in-town driving and no towing. FWIW I haven't gotten the "keep driving" message, a message that the DPF needs serviced, or a check engine light yet. Also, when I drive over ~70 on the highway for extended periods or if I'm towing my boat or fifth wheel, passive regeneration works as expected and keeps the DPF load gauge at 0%.

 

[Brutal_HO]

Not going to vote the poll as mine is 2020 HO, but it does have the AARFN MAF sensor. Absolutely no regen issues.

ETA: 10-24-2025, Started experiencing frequent regens and P24B4 PM sensor codes. Had the PM sensor replaced and they (my son) said the TSB for replacing the MAF with the ABMBV applied to my truck so they changed it. He does have the old sensor just in case it causes any issue.

 

[Ionicbrick]

150 miles between Regen cycles is too often, especially if you’re regularly towing.

That’s my thought. Had the dealer look at it, but said without a code it should be fine as long as they’re completing. I did do a manual regen that kept it from doing another one longer than it’s ever done, but otherwise it doesn’t once per week or so.
I haven’t had either of the recalls done, wondering if the additional DPF sensor and new flash would change anything…IDK


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[AH64ID]

What is normal or average for regens, I've been watching mine and haven't seen one for at least one if not two fill-up's
2020 2500 with 55000 miles, all recalls completed.

24 hours of engine runtime between regens is normal if the truck is being used like a HD diesel truck.

 

[Ostracize]

Trying to collect some data on the regeneration frequency issues. Based on all my research it sounds like the MAF (Mass Airflow Sensor) may be at the heart of many of these problems. There are, as far as I know, two different MAF sensors currently in circulation for these trucks. These can be identified by a series of letters on the sensor itself, as well as its country of origin which is also printed on the sensor. Both are easily identified by looking at the sensor from the outside of the air intake tube. From what I have gathered so far, these two sensors were installed starting in late-production 2021 and newer trucks. The two versions are:

“AARFN” produced in GERMANY

And

“ABMBV” produced in CHINA

If you have a 2021 or newer truck that is experiencing a regeneration frequency issue, I’d like to collect some data using the poll feature. Please fill out a response from the list of options provided. If you have additional information or comments, please include them as comments to this poll. These would include if you have had the MAF replaced as part of a diagnostic and repair procedure for a regeneration frequency issue. Thanks in advance for your input!

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View attachment 65633

Is the theory here that the China version is potentially the issue?.. Or part of it atleast

 

[mbarber84]

Is the theory here that the China version is potentially the issue?.. Or part of it atleast

Believe it or not, I’m hearing that the one made in China is the “better” one.

 

[steve49]

Not going to vote the poll as mine is 2020 HO, but it does have the AARFN MAF sensor. Absolutely no regen issues.

I didn't either mine is a 2019 with the AARFN, however I did have two early regens after switching to the Mopar AB air filter from the AA. Left the AB filter in and all is back to normal with regens at the 24 hour routine, and last mileage between was 802 miles.

 

[Ostracize]

Believe it or not, I’m hearing that the one made in China is the “better” one.

Ahh, interesting for sure. Thanks for working this.
Side note: I'm awaiting a cam for mine then the dealer is swapping the lifters (hydraulic), cam, p-rods, and any rockers if they're damaged... Your posts on here about the different lifters under the same p/n was super helpful. Went to my dealer last week and looked at the lifter set they had set aside for mine and good thing I did cause only 6 of them were the smooth bore (my understanding are the newest iteration) and the others were a mix of the various oiling groove styles. Dealer obviously had no idea but thankfully they are very cool and are willing to order/find the replacement smooth bores so they all match in design. Fingers crossed this all goes well

 

[OLEJOE]

I have the AARFN sensor in my 22’ 2500. Mine was regening every 3-400 miles and every 10-14 hours except when towing. I changed where I get my fuel (last tank and a half) and changed my driving routine to include more interstate driving and less stop and go. So far it’s at 783 miles and 21 hours and gauge is about a sixteenth or halfway to an eighth. It has gone up to a quarter a couple of times but quickly dropped back down once on the interstate running 70-75. Just hope it keeps it up.

Also testing some of my theories about the air filter situation. Soon as I get some info I’ll update.

 

[OLEJOE]

Just got my latest regen today after 896 miles and 25 hrs since last regen with DPF gauge on zero at the start. It had gone up to about where 3/16 would be on the gauge a couple of times but kept going back down with passive regens. Now, and so far, removing 2 of the slats from the AGS on top on both sides seems to make it passively regen easier. With the gauge on 3/16 it passively regened in 15 miles after being cranked cold and temp around 40 degrees F. I don’t know if it’s the new fuel I’m using or the extra air if any. It’s a Continuing experiment.

 

[flan]

Just got my latest regen today after 896 miles and 25 hrs since last regen with DPF gauge on zero at the start. It had gone up to about where 3/16 would be on the gauge a couple of times but kept going back down with passive regens. Now, and so far, removing 2 of the slats from the AGS on top on both sides seems to make it passively regen easier. With the gauge on 3/16 it passively regened in 15 miles after being cranked cold and temp around 40 degrees F. I don’t know if it’s the new fuel I’m using or the extra air if any. It’s a Continuing experiment.

That’s a normal sounding regen strategy. It’s all I’ve experienced (knocks on wood). I can probably count on one hand the amount my gauge has come off zero, but it’s usually not used as a grocery getter, unless we towed the camper to a location and had to go out and shop during our trip.