DPF trashed?

NotSoFast · Dec 12, 2022

My 2020 CTD was on the freeway and a notice came up that said an automatic regen was happening and to maintain highway speeds. 10 minutes later it pug the vehicle into limp mode and said to take it to the dealer. DPF gauge said 100% full.
Who ran two manual regen cycles and ran it for 40 miles. They replaced the fuel filters and air filters and said the fuel filter near the tank was pretty funky. Cost about $1000. They also replaced the recalled fuel pump. (Which hadn't failed.)
Now it regens every day and the DPF gauge occasionally goes to zero right after s regen, but mostly shows 5 or 20 % and up to 50% full. Typical regen is 15 miles or so.
The truck is about 50% towing miles with a 4500 pound trailer, and some towing a bit heavier. It doesn't get used for much short trips.
We live in Flagstaff at 7000 feet, so it is a cold-climate truck for the most part.
I never paid to much attention to the DPF gauge, because it always read zero before. Now it's seldom zero for long.
The DPF filter is under warranty, but the dealer says it isn't throwing any codes and nothing is wrong.
Is the DPF filter trashed? My wife is scared to take us on a long trip because she thinks it will leave us stranded and needing to get towed to a dealer and then wait a week for a new exhaust filter. How long will it run in limp mode before it shuts down?

06 Dodge · Dec 12, 2022

Both fuel filters need to be changed every 12 months or 15K same for your oil. Also are you using fuel with 20% Bio mixed in? High Bio content can allow algae to grow in you tank an create fuel system problems.. How long does a tank of DEF last? Also where are you getting your DEF from? Did you know that DEF has a short 6 month or so shelf life in high temps like you see in AZ? IIRC limp mode allows truck to move at approx. 5 mph, as for how many miles it can go at that speed I have no knowledge about that...

mtnrider · Dec 13, 2022

Unlikely the DPF is "trashed" given the newness of the truck and your driving habits, but anything is possible? I would probably lean towards a differential pressure sensor not reading correctly but without a code the dealer is not going to touch it. That's all they know how to do is troubleshoot by codes these days.

Not sure how long you can go once it hits limb mode for that? Probably no more then 150 miles? Or until you shut it off it will be in limp when you start back up.

when you say it regens every day, how far are you driving daily? Are you going far enough for it to warm up and complete the regen? If not it's just going to start all over the next time you drive it

.

06 Dodge · Dec 13, 2022

IIRC the DPF does a passive regen every 20-25 hours of engine operation unless it needed sooner based on sensors readings, its also wise to be check the date of your DEF to be sure your using the newest dated fluid if buying boxed DEF, I also recall being told that old or weak DEF will cause problems with the DPF system...

2020PW · Dec 16, 2022

Just buy a def refractometer. It’s about $100 but worth it.

WY-Dave · Dec 19, 2022

2020PW said:
refractometer

This is the one i got off of amazon. <$20. And just as accurate of a bud that I know in the Big Rig shop and his was somewhere around $200 IIRC

https://www.amazon.com/SMARTSMITH-Refractometer-AdBlue-Exhaust-Concentration/dp/B07WDGPSHB/ref=sr_1_1_sspa?crid=388JPDSRFR04J&keywords=DEF%2Brefractometer&qid=1671426144&sprefix=def%2Brefractometer%2Caps%2C129&sr=8-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyQ1UyVEVCWE5JSUNSJmVuY3J5cHRlZElkPUEwMjQzODU0MjVPVTNOMUVJTENLTSZlbmNyeXB0ZWRBZElkPUExMDE1OTEyWEhBU1A1N1VNQ1ZJJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1

crash68 · Dec 19, 2022

06 Dodge said:
I also recall being told that old or weak DEF will cause problems with the DPF system...

Doubt DEF problems would cause any DPF issues as the SCR which the DEF is injected into is downstream of the DPF.

06 Dodge · Dec 19, 2022

crash68 said:
Doubt DEF problems would cause any DPF issues as the SCR which the DEF is injected into is downstream of the DPF.

That info given to me came from NW JCDR dealership service dept.

Brent 1955 · Feb 16, 2023

06 Dodge said:
Both fuel filters need to be changed every 12 months or 15K same for your oil. Also are you using fuel with 20% Bio mixed in? High Bio content can allow algae to grow in you tank an create fuel system problems.. How long does a tank of DEF last? Also where are you getting your DEF from? Did you know that DEF has a short 6 month or so shelf life in high temps like you see in AZ? IIRC limp mode allows truck to move at approx. 5 mph, as for how many miles it can go at that speed I have no knowledge about that...

But isn't he talking DEF and not Fuel There is no DEF filters. At least none I have found. Fuel filters yes. I change mine every 6 months.

Brent 1955 · Feb 28, 2023

NotSoFast said:
My 2020 CTD was on the freeway and a notice came up that said an automatic regen was happening and to maintain highway speeds. 10 minutes later it pug the vehicle into limp mode and said to take it to the dealer. DPF gauge said 100% full.
Who ran two manual regen cycles and ran it for 40 miles. They replaced the fuel filters and air filters and said the fuel filter near the tank was pretty funky. Cost about $1000. They also replaced the recalled fuel pump. (Which hadn't failed.)
Now it regens every day and the DPF gauge occasionally goes to zero right after s regen, but mostly shows 5 or 20 % and up to 50% full. Typical regen is 15 miles or so.
The truck is about 50% towing miles with a 4500 pound trailer, and some towing a bit heavier. It doesn't get used for much short trips.
We live in Flagstaff at 7000 feet, so it is a cold-climate truck for the most part.
I never paid to much attention to the DPF gauge, because it always read zero before. Now it's seldom zero for long.
The DPF filter is under warranty, but the dealer says it isn't throwing any codes and nothing is wrong.
Is the DPF filter trashed? My wife is scared to take us on a long trip because she thinks it will leave us stranded and needing to get towed to a dealer and then wait a week for a new exhaust filter. How long will it run in limp mode before it shuts down?

first stage 250 miles but if it slows you down to 45 you have less than 50 miles on limp mode to find a dealership.

Brent 1955 · Mar 20, 2023

NotSoFast said:
My 2020 CTD was on the freeway and a notice came up that said an automatic regen was happening and to maintain highway speeds. 10 minutes later it pug the vehicle into limp mode and said to take it to the dealer. DPF gauge said 100% full.
Who ran two manual regen cycles and ran it for 40 miles. They replaced the fuel filters and air filters and said the fuel filter near the tank was pretty funky. Cost about $1000. They also replaced the recalled fuel pump. (Which hadn't failed.)
Now it regens every day and the DPF gauge occasionally goes to zero right after s regen, but mostly shows 5 or 20 % and up to 50% full. Typical regen is 15 miles or so.
The truck is about 50% towing miles with a 4500 pound trailer, and some towing a bit heavier. It doesn't get used for much short trips.
We live in Flagstaff at 7000 feet, so it is a cold-climate truck for the most part.
I never paid to much attention to the DPF gauge, because it always read zero before. Now it's seldom zero for long.
The DPF filter is under warranty, but the dealer says it isn't throwing any codes and nothing is wrong.
Is the DPF filter trashed? My wife is scared to take us on a long trip because she thinks it will leave us stranded and needing to get towed to a dealer and then wait a week for a new exhaust filter. How long will it run in limp mode before it shuts down?

I have a friend that lives in Winslow and uses the dealer in Flagstaff. If the DPF system clears itself, then it isn't a problem. Mine stays at 40% full most of the time even after Regens. sometimes. If it isn't showing a code Ram won't do a thing for you. I like the Ram dealership in Prescott Az there pretty straight forward. I have 585,000 miles on my truck. I wouldn't worry about it. As long as it continues to regen. I would tell you to go buy some additive called Pittsburg Power and read the directions it helps keep the DPF system clean it is added to the fuel system like 1 ounce per tankful. It isn't cheap but I swear by it.

Brent 1955 · Apr 11, 2023

NotSoFast said:
My 2020 CTD was on the freeway and a notice came up that said an automatic regen was happening and to maintain highway speeds. 10 minutes later it pug the vehicle into limp mode and said to take it to the dealer. DPF gauge said 100% full.
Who ran two manual regen cycles and ran it for 40 miles. They replaced the fuel filters and air filters and said the fuel filter near the tank was pretty funky. Cost about $1000. They also replaced the recalled fuel pump. (Which hadn't failed.)
Now it regens every day and the DPF gauge occasionally goes to zero right after s regen, but mostly shows 5 or 20 % and up to 50% full. Typical regen is 15 miles or so.
The truck is about 50% towing miles with a 4500 pound trailer, and some towing a bit heavier. It doesn't get used for much short trips.
We live in Flagstaff at 7000 feet, so it is a cold-climate truck for the most part.
I never paid to much attention to the DPF gauge, because it always read zero before. Now it's seldom zero for long.
The DPF filter is under warranty, but the dealer says it isn't throwing any codes and nothing is wrong.
Is the DPF filter trashed? My wife is scared to take us on a long trip because she thinks it will leave us stranded and needing to get towed to a dealer and then wait a week for a new exhaust filter. How long will it run in limp mode before it shuts down?

Wish I had a gauge in my truck on the system

mtnrider · Apr 11, 2023

Brent 1955 said:
Wish I had a gauge in my truck on the system

There are 3rd party apps you can use on your phone to see a regen (as well as many other PIDs). I used torque pro on my 2016 and could see when a regen triggered, the increased EGT's at the DPF as well as monitor the differential pressure across the DPF (percentage full) to see about when it would do another regen.

.

Timsdually · Sep 10, 2023

Thought I would bump this.
My 2020 truck just came up with the regen warning, something it never did before. It would regen and if I went through the screen I could check the gauge out. Today it chimed and flashed up on the screen. Then the warning came up "Reduced power. See dealer". I brought the gauge back up and it was about 40%.
I went out of the gauge screen and within a couple miles it flashed the Full warning again. So, I went back to the gauge and it read about 75% full. The warning came up again after a couple miles and I went back to the gauge and this time the gauge was still at 75% but it had turned red color.
When I got home and checked it again, the gauge was 100% and still red.

So, I have about 100 miles before it strands me? I have four dealers that are near me and each one is about 40 miles away. It looks like it will be whoever gets me in first. I had a trip to MD planned for this Wednesday, but that looks in doubt now.

DPF trashed?

NotSoFast

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