Automatic Regen too often

[22PearlRamMegaHD]

my '22 just started to regen and show DPF filling quickly, 42,500 miles. started after oil change, fuel filters and air filter change.

truck has an S&B intake setup that has been on for almost 40k miles. i can only think of 1 other time the truck regen'd outside of the 24hr forced regen. the S&B had an oiled filter on it, switched to the dry filter. i also used docs diesel fuel filters this time instead of OEM.

i did have one code show up with no warning light - P1451-00 - exhaust temp not high enough for active regen?

does the MAF sensor not recalibrate on its own? im assuming the air filter change has prompted my issues.

It does, from my understanding but takes a while if you just daily drive. The relearn is essentially drive on the highway for 10 minutes maintaining 2600 RPM, the shut off for 10 minutes and allow the computer to fully shutdown. Then do that 2 more times (3 total).

I've recently been warned about docs products. My 27k mile 2022 has used them 2x. I'm not saying they're why my truck is in the shop, but now 6 weeks in without the truck I've made the conscious decision to use OEM or Fleetguard for fuel, and Donaldson for oil (blue can filter from XDP.com - $43.33 with shipping).

The dealer replaced the MAF last Thursday, and since I got no update from them I'm guessing it didn't solve the regen issue.

 

[22PearlRamMegaHD]

my '22 just started to regen and show DPF filling quickly, 42,500 miles. started after oil change, fuel filters and air filter change.

truck has an S&B intake setup that has been on for almost 40k miles. i can only think of 1 other time the truck regen'd outside of the 24hr forced regen. the S&B had an oiled filter on it, switched to the dry filter. i also used docs diesel fuel filters this time instead of OEM.

i did have one code show up with no warning light - P1451-00 - exhaust temp not high enough for active regen?

does the MAF sensor not recalibrate on its own? im assuming the air filter change has prompted my issues.

Also you might do a couple things - clean the MAF sensor with MAF cleaner in case it got oiled in that short time. Then also see if it was the made in Germany or made in China one. The German MAF seems to be the problem child.

 

[Ostracize]

FYI,

Those are "TMAP" Sensors.

Pick them up genuine Cummins 2897334 part on ebay $60-100.

Genos has them for $107. 90 day return policy.

Makes sense as to why it's different. Just only ever see the German one installed from oem. And maybe I just missed it but geno's also shows the German one when searching for 2897334.

 

[steve49]

Has that sensor been replaced to your knowledge? Have you had the truck since new?
Asking because that's not the oem sensor and funny thing is even though it says usa on it... The only vendor I can find that sells it is AliExpress which to my knowledge predominantly sells chineseium items. If it's working fine then great.. I just find it odd.

I bought the truck new and no the sensor has not been replaced, had the factory paint stick mark when quality control checked during assembly. When I ran the number it came back as a Cummins part number and found to fit various Cummins products, several vendors carried it as Brutal said. Also during my search 2897334 some of the Cummins boxed units the sensor was labeled USA, and some labeled Germany, So I would guess the ones labeled Germany are a newer replacement.

 

[kfscoll]

I cleaned the soot completely off of my MAF several months ago and haven't really noticed a change in regeneration behavior (aside from the increased frequency that seems to accompany warmer weather). My MAF is Chinese FWIW.

 

[flan]

china/Germany MAP does not seem to make as much difference as earlier suggested by FCA. I haven’t heard if anyone having a long term decrease in regens after having the MAF swapped out.

 

[CaptainMike]

china/Germany MAP does not seem to make as much difference as earlier suggested by FCA. I haven’t heard if anyone having a long term decrease in regens after having the MAF swapped out.

Yup, the only thing that's helping mine is DPF replacement, but I'm pretty sure that is a symptom of an upstream problem.

 

[56ram2500]

without the truck I've made the conscious decision to use OEM or Fleetguard for fuel, and Donaldson for oil (blue can filter from XDP.com - $43.33 with shipping).

If you want to use DBL 7349 oil filters you can buy them much cheaper from Cross Filters, 3 filters for $52 or $26 if you buy just one: https://crossfilters.com/products/d...ll-flow-donaldson-blue?variant=42426482721021

 

[19Ram2500.Mega]

Got my truck back and per the notes on the repair all of the injectors failed testing, which statistically would seem highly implausible. New ones were installed and tested and now they seem to be functioning as designed.

That oil has been replaced again, so I will be monitoring that.

On another note, the truck went from 0-regen in 20 miles (mainly highway), so if I had to guess, a symptom has been fixed, not the problem and it will be back in the shop soon due to the same code.

Not sure if it is normal, but the truck now feels oddly sluggish. Also odd is my average mpg dropped from 16 (which was far worse than it used to be) to just over ten on my dash after the test drives, which means something is running really poorly, the manual Regens are havak on y9ur overall, or people were hammering the crap out of my truck during a function test.

 

[mbarber84]

I’m logging some time with the iDash monitor. Mainly watching EGT readings and DPF functions. It’s shocking to watch how quickly the “DPF % REG” data point climbs. This is basically the one that tells you how close you are to the truck initiating an active regeneration. My truck performed another active regeneration today. 350 miles and 12 hours since last. Admittedly I had some idle time and some lower speed driving in this one due to the farming season starting. This necessities sine different driving than my usual routine when I’m going to work during the school year. Upon completion, the iDash was showing 17% on the DPF reg pid. On my 13 min drive home from the farm today, the DpF % ReG pid rose from 17% to 45%. It’s a 4.9 Mike drive, 3/4 of which is interstate highway at 70mph or higher. Granted, I know that number will be lower when I restart the truck tomorrow morning, but it’s hard to fathom why the % climbs so fast. Either there’s a malfunction somewhere in my
Truck or the software / programming they’re using to calculate that value has serious flaws.

 

[19Ram2500.Mega]

I’m logging some time with the iDash monitor. Mainly watching EGT readings and DPF functions. It’s shocking to watch how quickly the “DPF % REG” data point climbs. This is basically the one that tells you how close you are to the truck initiating an active regeneration. My truck performed another active regeneration today. 350 miles and 12 hours since last. Admittedly I had some idle time and some lower speed driving in this one due to the farming season starting. This necessities sine different driving than my usual routine when I’m going to work during the school year. Upon completion, the iDash was showing 17% on the DPF reg pid. On my 13 min drive home from the farm today, the DpF % ReG pid rose from 17% to 45%. It’s a 4.9 Mike drive, 3/4 of which is interstate highway at 70mph or higher. Granted, I know that number will be lower when I restart the truck tomorrow morning, but it’s hard to fathom why the % climbs so fast. Either there’s a malfunction somewhere in my
Truck or the software / programming they’re using to calculate that value has serious flaws.

I agree it climbs rapidly, but I would have expected the fuel in the oil on my end was causing the dpf issues to be even more exaggerated. With those "repaired", I was hoping my regen frequency would decrease to closer to what you are experiencing. Before the repair, it would regen about the same as it did today.

 

[superjoe83]

I’m logging some time with the iDash monitor. Mainly watching EGT readings and DPF functions. It’s shocking to watch how quickly the “DPF % REG” data point climbs. This is basically the one that tells you how close you are to the truck initiating an active regeneration. My truck performed another active regeneration today. 350 miles and 12 hours since last. Admittedly I had some idle time and some lower speed driving in this one due to the farming season starting. This necessities sine different driving than my usual routine when I’m going to work during the school year. Upon completion, the iDash was showing 17% on the DPF reg pid. On my 13 min drive home from the farm today, the DpF % ReG pid rose from 17% to 45%. It’s a 4.9 Mike drive, 3/4 of which is interstate highway at 70mph or higher. Granted, I know that number will be lower when I restart the truck tomorrow morning, but it’s hard to fathom why the % climbs so fast. Either there’s a malfunction somewhere in my
Truck or the software / programming they’re using to calculate that value has serious flaws.

I think it's just how they are programmed, my '18 was similar to that, after an active regen the pid would be in the ~40% range, then after a restart it would be down around 10% then climb up to 30-40% fairly quickly. I never watched the hours but probably around 10hrs or so it would stick in the 40's then slowly climb up to 100% for the 24hr regen. My '22 is very similar in operation

 

[DougB]

I’m logging some time with the iDash monitor. Mainly watching EGT readings and DPF functions. It’s shocking to watch how quickly the “DPF % REG” data point climbs. This is basically the one that tells you how close you are to the truck initiating an active regeneration. My truck performed another active regeneration today. 350 miles and 12 hours since last. Admittedly I had some idle time and some lower speed driving in this one due to the farming season starting. This necessities sine different driving than my usual routine when I’m going to work during the school year. Upon completion, the iDash was showing 17% on the DPF reg pid. On my 13 min drive home from the farm today, the DpF % ReG pid rose from 17% to 45%. It’s a 4.9 Mike drive, 3/4 of which is interstate highway at 70mph or higher. Granted, I know that number will be lower when I restart the truck tomorrow morning, but it’s hard to fathom why the % climbs so fast. Either there’s a malfunction somewhere in my
Truck or the software / programming they’re using to calculate that value has serious flaws.

I think it's just how they are programmed, my '18 was similar to that, after an active regen the pid would be in the ~40% range, then after a restart it would be down around 10% then climb up to 30-40% fairly quickly. I never watched the hours but probably around 10hrs or so it would stick in the 40's then slowly climb up to 100% for the 24hr regen. My '22 is very similar in operation

This is how mine behaves. Bounces from 10-13 post-regen to mid 40s for the several drives but eventually it stays in the 40s and climbs from there till the next regen. I usually regen about every 100-120mi, 5-6 hours, with city driving. If I get some highway miles mixed in then it moves up just slightly.

Last winter on a long highway trip it went the 24 hrs between regens. Have a 300mi round towing trip coming next week. Should see passive regen the entire trip. In July have a trip out west so will be watching how it does on highway in the higher temps. Hoping plenty of passive regen and hitting the 24 the mark again.

 

[Units]

This is how mine behaves. Bounces from 10-13 post-regen to mid 40s for the several drives but eventually it stays in the 40s and climbs from there till the next regen. I usually regen about every 100-120mi, 5-6 hours, with city driving. If I get some highway miles mixed in then it moves up just slightly.

Last winter on a long highway trip it went the 24 hrs between regens. Have a 300mi round towing trip coming next week. Should see passive regen the entire trip. In July have a trip out west so will be watching how it does on highway in the higher temps. Hoping plenty of passive regen and hitting the 24 the mark again.

Seems like everyone who doesn’t tow on a regular basis is seeing very similar soot loading patterns during the summer months so far, very interesting. Right now I get 200 - 250 between regens just driving my daily commute. I too have a long trip coming up pulling my TT and should have no problems hitting the 24hr mark. I did just add a bottle of archoil diesel fuel system cleaner cause, what the heck, why not. Curious to see if it effects soot loading at all.

 

[bobbo7915]

have OBD link setup now to watch the soot level and EGT. my truck was going into regen every 75 miles, would finish and immediately start increasing soot level. the last regen i was watching the soot level increase as the regen was going (15-20minutes into the regen)

I stopped the truck mid regen, swapped in my old air filter, the regen completed like normal (soot level decreasing as i drove during the cycle) - i have since driven 100 miles since the last regen with the old air filter still installed and the soot level hasn't increased.

i'm thinking there is a software glitch that doesnt handle the increased airflow of a new airfilter correctly. I admittedly ran the old air filter for too long but was/am able to see a difference in the MAF airflow reading even at idle with the new filter versus the old filter.

i'll have to put the new filter in and run through the MAF re-learn before a regen starts to see if that changes things

 

[mbarber84]

have OBD link setup now to watch the soot level and EGT. my truck was going into regen every 75 miles, would finish and immediately start increasing soot level. the last regen i was watching the soot level increase as the regen was going (15-20minutes into the regen)

I stopped the truck mid regen, swapped in my old air filter, the regen completed like normal (soot level decreasing as i drove during the cycle) - i have since driven 100 miles since the last regen with the old air filter still installed and the soot level hasn't increased.

i'm thinking there is a software glitch that doesnt handle the increased airflow of a new airfilter correctly. I admittedly ran the old air filter for too long but was/am able to see a difference in the MAF airflow reading even at idle with the new filter versus the old filter.

i'll have to put the new filter in and run through the MAF re-learn before a regen starts to see if that changes things

Could also be the MAF malfunctioning. There’s been intermittent success with some trucks by replacing the MAF.

 

[Units]

have OBD link setup now to watch the soot level and EGT. my truck was going into regen every 75 miles, would finish and immediately start increasing soot level. the last regen i was watching the soot level increase as the regen was going (15-20minutes into the regen)

I stopped the truck mid regen, swapped in my old air filter, the regen completed like normal (soot level decreasing as i drove during the cycle) - i have since driven 100 miles since the last regen with the old air filter still installed and the soot level hasn't increased.

i'm thinking there is a software glitch that doesnt handle the increased airflow of a new airfilter correctly. I admittedly ran the old air filter for too long but was/am able to see a difference in the MAF airflow reading even at idle with the new filter versus the old filter.

i'll have to put the new filter in and run through the MAF re-learn before a regen starts to see if that changes things

Which air filter were/are you currently running? Using the air filter with the glue strips down the pleats has caused regeneration issues for some folks.

 

[OLEJOE]

have OBD link setup now to watch the soot level and EGT. my truck was going into regen every 75 miles, would finish and immediately start increasing soot level. the last regen i was watching the soot level increase as the regen was going (15-20minutes into the regen)

I stopped the truck mid regen, swapped in my old air filter, the regen completed like normal (soot level decreasing as i drove during the cycle) - i have since driven 100 miles since the last regen with the old air filter still installed and the soot level hasn't increased.

i'm thinking there is a software glitch that doesnt handle the increased airflow of a new airfilter correctly. I admittedly ran the old air filter for too long but was/am able to see a difference in the MAF airflow reading even at idle with the new filter versus the old filter.

i'll have to put the new filter in and run through the MAF re-learn before a regen starts to see if that changes things

I had been running my truck for months with some of the AGS slats or vanes removed with no issues. I reinstalled all of them and the next drive went from 0% on the DPF gauge to automatic regen within 30 miles. I was nowhere near a timed 24 hr regen. Theoretically, that alone should have made no difference but it did. I immediately took them back out when I got home but it didn’t help. The air filter actually stays cleaner without the vanes in. I get some bugs but not the black greasy coating the old one had on it. Has anyone tried changing the other sensor in the air filter box besides the MAF ? You would think after 2 years of these problems it would have been figured out why these trucks can’t adjust to varying conditions quicker than the months that it seems to take. As @mbarber84 has stated, his truck went back to its bad habits simply because the ambient temperature went up. That in itself should tell someone what the problem is.

 

[mbarber84]

I had been running my truck for months with some of the AGS slats or vanes removed with no issues. I reinstalled all of them and the next drive went from 0% on the DPF gauge to automatic regen within 30 miles. I was nowhere near a timed 24 hr regen. Theoretically, that alone should have made no difference but it did. I immediately took them back out when I got home but it didn’t help. The air filter actually stays cleaner without the vanes in. I get some bugs but not the black greasy coating the old one had on it. Has anyone tried changing the other sensor in the air filter box besides the MAF ? You would think after 2 years of these problems it would have been figured out why these trucks can’t adjust to varying conditions quicker than the months that it seems to take. As @mbarber84 has stated, his truck went back to its bad habits simply because the ambient temperature went up. That in itself should tell someone what the problem is.

I think it’s air density.
I’d love to invest in the Banks intake, eliminate the plenum restriction, and upgrade the charge air piping to match. I’d be willing to bet I would see an Increase in performance and a reduction in regeneration necessity. I’m just trying to decide whether it’s worth it to keep tossing money at this thing in search of answers to problems that the manufacturer should have already addressed. This is the first time in my 20+ years of Dodge / Ram loyalty where I’ve encountered issues. It’s even more disappointing to realize they don’t seem willing, interested, or able to rectify them.

 

[OLEJOE]

I think it’s air density.
I’d love to invest in the Banks intake, eliminate the plenum restriction, and upgrade the charge air piping to match. I’d be willing to bet I would see an Increase in performance and a reduction in regeneration necessity. I’m just trying to decide whether it’s worth it to keep tossing money at this thing in search of answers to problems that the manufacturer should have already addressed. This is the first time in my 20+ years of Dodge / Ram loyalty where I’ve encountered issues. It’s even more disappointing to realize they don’t seem willing, interested, or able to rectify them.

I agree. I loved my 18 and kick my a for ever getting rid of it.