Automatic Regen too often

[TomTom]

Another thought I had was that perhaps there is some mismatch between injectors and the CP3/CP4 pump changes? Maybe they ran the CP4 at different pressures and changed the injectors as well, then switching back to the CP3 caused some issue? Or someone just didn't remove some line of code.....

 

[mbarber84]

1.) Mixed city and highway. Mostly highway regularly. Towing occasionally for longer trips and this hasn't generally been an issue when towing, only when unloaded.
2.) 2022, 34,000 miles
3.) I perform my own maintenance. However, they did just tell me that they wanted to clean my injectors and based on some of the discussion here about Archoil, I am going to have them do that even thought its a bit expensive. They claim this is a normal part of the maintenance based on my miles. I don't know if I believe them but thought it might at least be worth a try.
4.) The code was P2459 - Regen Frequency
5.) 95% of the time I let finish it before parking. There are some odd occasions where I just can't due to timing.

Sounds like you’re doing things right.
Definitely makes me think you have an issue.
What engine air filter are you currently using?
As far as the fuel injector cleaning goes, that is not a part of routine maintenance for these trucks. Aside from a dose of fuel system cleaner in the tank every so often, there’s really nothing else to do with the injectors. At 30k miles, they definitely shouldn’t need removed.

 

[mbarber84]

1.) Mixed city and highway. Mostly highway regularly. Towing occasionally for longer trips and this hasn't generally been an issue when towing, only when unloaded.
2.) 2022, 34,000 miles
3.) I perform my own maintenance. However, they did just tell me that they wanted to clean my injectors and based on some of the discussion here about Archoil, I am going to have them do that even thought its a bit expensive. They claim this is a normal part of the maintenance based on my miles. I don't know if I believe them but thought it might at least be worth a try.
4.) The code was P2459 - Regen Frequency
5.) 95% of the time I let finish it before parking. There are some odd occasions where I just can't due to timing.

So the truck is definitely tripping the P2459 code.
Regenerating too often. So far, what has your dealer done in terms of diagnostic and testing to determine the cause?

 

[AH64ID]

This is an interesting thought I'd be interested to see a response from a more seasoned diesel guy on. I know on older diesels if you ran lean, you ran hotter. My dad suggested a tune on my prior truck (ecodiesel) that would run lean - increased MPG and significantly less regens. I ended up with a GDE tune that I'm not sure ran any leaner, but I did have higher EGTs with better fuel mileage, less regens, and increased HP/torque numbers as well as improved power curve. It also disabled the EGR, but the tradeoff was slightly higher DEF usage.

You’re thinking of lean and rich like in a gas engine, and it’s just not the same in a diesel. Older diesel’s didn’t regulate the intake airflow, so they used whatever air was there and there wasn’t a direct way to effect the air:fuel ratio like with gas. The air:fuel ratio on a diesel is constantly varying.

In terms of cruise performance increased mpg’s generally comes form advanced timing, which reduces EGT’s since more of the combustion energy is used in the powerstroke. You end up with less boost, lower EGT’s, higher cylinder temps, and higher cylinder pressure.

 

[TomTom]

So the truck is definitely tripping the P2459 code.
Regenerating too often. So far, what has your dealer done in terms of diagnostic and testing to determine the cause?

Essentially nothing as far as diagnostics is concerned from what I can tell. I had to point them to the Ram bulletin about MAF, boost leaks, etc. They changed the MAF sensor but that didn't help.

 

[TomTom]

Sounds like you’re doing things right.
Definitely makes me think you have an issue.
What engine air filter are you currently using?
As far as the fuel injector cleaning goes, that is not a part of routine maintenance for these trucks. Aside from a dose of fuel system cleaner in the tank every so often, there’s really nothing else to do with the injectors. At 30k miles, they definitely shouldn’t need removed.

Was running the Fleetgaurd with orange foam and correct part number. However, it seemed a bit yellow so recently changed over to a Mopar from Geno's. The truck did seem to like the Mopar one better at first, regenning passively fairly easy around surface streets, but then taking it out on the highway all the old problems popped up again. Going from 30% DPF full to 70-80% DPF full in a few miles for example.

 

[TomTom]

Was running the Fleetgaurd with orange foam and correct part number. However, it seemed a bit yellow so recently changed over to a Mopar from Geno's. The truck did seem to like the Mopar one better at first, regenning passively fairly easy around surface streets, but then taking it out on the highway all the old problems popped up again. Going from 30% DPF full to 70-80% DPF full in a few miles for example.

I should also mention that my gear shifts seem to be rough to me...when I switched the air filter, they seemed to get better right away.....now they are sort of going back to being rough. Not sure what that is about.

 

[oledirteh]

As far as the fuel injector cleaning goes, that is not a part of routine maintenance for these trucks. Aside from a dose of fuel system cleaner in the tank every so often, there’s really nothing else to do with the injectors. At 30k miles, they definitely shouldn’t need removed.

yea ive owned 3 6.7's with well over 100k on them minus my current one which is almost there and never had to do injector cleaning as a routine maintenance.....


@TomTom do you by chance have access to another dealer? For one you paid a good bit of money for a truck, and if the tech is treating you like this id either punch him in the face or go elsewhere.



be neat if you could swap out the ecu with one from say a 2018 or 2021 into one of these trucks with that years tune and see what it changes. however it would have to be modified for the cp3/cp4. my truck thankfully has the cp3.

As of today ive put about 200 miles on archoil, fuel milage seems up a not quite a mile per gallon. im currently sitting around 700 miles (11 hrs) since last regen, but the % hasnt gone up.

 

[OLEJOE]

Another thought I had was that perhaps there is some mismatch between injectors and the CP3/CP4 pump changes? Maybe they ran the CP4 at different pressures and changed the injectors as well, then switching back to the CP3 caused some issue? Or someone just didn't remove some line of code.....

I remember reading something in 2019 when they made the change to the CGI block about higher fuel pressure with the new cp4 hpfp and I have wondered if maybe there was a mismatch with the cp3.

 

[oledirteh]

The cp3 has a higher flow then a cp4.x 3 plungers vs 2 plungers. cp3's stop working, cp4 sheds itself into your fuel system.


Now, that is something that i dont know thats been looked into, but possibly going the cp3 conversion from a cp4. cp3 trucks dont seem to have the issues everyone with cp4's do.

 

[mbarber84]

The cp3 has a higher flow then a cp4.x 3 plungers vs 2 plungers. cp3's stop working, cp4 sheds itself into your fuel system.


Now, that is something that i dont know thats been looked into, but possibly going the cp3 conversion from a cp4. cp3 trucks dont seem to have the issues everyone with cp4's do.

All Ram HD’s 2021 model year and newer come from the factory with the CP-ISB21 which is the updated version of the CP3. The CP4 was only used in 2019 and 2020, and both model years are eligible for a CP4 to CP-ISB21 swap out under recall.

 

[TomTom]

All Ram HD’s 2021 model year and newer come from the factory with the CP-ISB21 which is the updated version of the CP3. The CP4 was only used in 2019 and 2020, and both model years are eligible for a CP4 to CP-ISB21 swap out under recall.

Do you know if that swap out includes new injectors?

 

[steve49]

No just the pump and lines.

 

[TomTom]

No just the pump and lines.

View attachment 74106

Interesting. It feels like with the supply chain shortages in 2020-2023 its very possible that they cut some corners somewhere not thinking there would be an issue, but that there is. That or potentially the tuning wasn't properly re-written for the change back to the CP3. I guess if there were put back on in 2021 though and those trucks aren't having the same issues, potentially that's not it. Interesting thought that no one has seemingly figured out the 2022 tuning though too....all delete kits are currently running off of 2021 tunes.

 

[AH64ID]

Regarding CP3 vs CP4, the injectors don't care and combustion doesn't care. All the CP3/CP4 does is pressurize the fuel. 20K psi is 20K psi to the injectors/ignition/combustion.

 

[oledirteh]

Regarding CP3 vs CP4, the injectors don't care and combustion doesn't care. All the CP3/CP4 does is pressurize the fuel. 20K psi is 20K psi to the injectors/ignition/combustion.

arent there differences however with how it can affect injector pulse / timing ect? i ask cause there was some issues with the ecodiesel when they did the cp4 recall. it changed the injector timing.

 

[AH64ID]

arent there differences however with how it can affect injector pulse / timing ect? i ask cause there was some issues with the ecodiesel when they did the cp4 recall. it changed the injector timing.

Shouldn't be any way for the pump to effect injector timing since the injectors are electronically fired.

 

[TomTom]

Right, but isn’t the CP4 capable of 30k psi and the CP3 only capable of 26k psi? If they are running at different pressures then it seems like it would make sense for a different injector?

 

[FE427TP]

How does the system pick up crank position for injection timing? Could that system be injecting late and causing more soot? Or thinner tubing from previous model years having more flex not getting full pressure to the injector?

 

[flan]

I had a CP4 with no regen issues, they switched mine out to the CP3 back around 2020 and I still have no regen issues.