Cummins 6.7 issues

Anyone had similar issues…..

Brought a 2020 Ram 2500 with Cummins 6.7 with 30,000 on it. It was in basically new condition. I have put 5,000mi on it. Drove perfect the first 3,500 or so. Then it got a check engine light. Code is P2002 which is particulate filter below efficiency threshold. I researched it. I figured it was due to short drives during regen cycles and figured it would clear. It went through several full cycles. Didn’t clear but didn’t seem to notice anything driving.

Then it started acting like it was either shirting funny or had some hesitation once in a while at 1,700 to 1,800 rpm. That seems to be progressively getting worse . Then it had code P0229 which is Turbo Underboost. Made an appointment to have a diesel mechanic my buddies use. They are going to look at it on Tuesday.

At first I thought it had to do with the transmission. I don’t think it does because if I down shift and keep the rpm out of the 1,700 to 1,800 range it doesn’t do it. When it goes in that range regardless of gear it does it.

I think it’s got issues with sensors on the particulate filter. I think it thinks it’s not as dirty as it is so it’s not going it to the regen cycle as needed. That’s causing back pressure to the turbo. Particulate gauge is at zero.

It’s out of the manufacturer’s bumper to bumper warranty at over 3 years. It still has the Drive Train warranty. No telling at this point if it’s $500 or $5,000. I can afford to have it fixed. I don’t need the extended warranty. I am so far ahead of the cost over the years I could pay a lot and still be ahead.

I brought it for towing ability after having 4 Ford F150 Super crews. I thought the Cummins was a better motor than the Power Stroke. Always been Ford guy. Got good service out of them. Looking to get a 5th wheeler when retired. Never had a major problem with any of the Fords. Most I have ever spent on one driving to 175k plus was $2,000k for an evaporator coil. Thinking at this point I should have just got another Ford.

If it’s the dpf, that will be covered by emissions warranty. Pray it’s something covered, that’s exactly why I got rid of my diesel and don’t want to go back.

Yeah, most mechanics say the DEF systems made the diesels not what they once were.

Probably needs a manuel regen. Short trips on a diesel will cause the system not to regen or not regen frequently enough! Couple of manuel regens should fix it!

These trucks don't like short commutes, make sure you drive it enough to get it up to operating temps and don't idle it like the old diesels. Stop and go traffic will also contribute to your DPF system issues. In short they're not really designed for people that live and commute in extreme urban settings.

Got word back from the shop. They say it needs a manual regen. Also the upper fuel filter has a leak. Find that interesting as there is zero diesel smell. They are going to do the regen and replace both fuel filters.

I am staying away from the 20% biodiesel. Some say it’s ok, some say it will cause issues.

I will try to drive the piss out of it more often .

Apparently they fixed it. Runs perfect. They replaced both fuel filters. They showed 24% life in them. I brought the truck with 30,000 miles now it’s got 35,000. Not sure when they last changed the filters since you can reset the life count with the steering wheel controls. Mechanic said the one under the hood had a leak. Never smelled any diesel.

They also did a manual regen. The thing is the particulate filter wasn’t showing much on the screen. It’s actually higher now at 15% of so. It hasn’t done an active regen yet.

Drove it about 150 miles so far. Runs great. No check engine light or codes.

I am going to try to avoid the short little hops around the house. Thing is my truck and company vehicle are in the driveway. Wife just got a new Hyundai Sante Fe which is super nice. Top end Calligraphy trim level. However, it’s in the garage so it’s a PIA to take it. Also going to drive the Ram at little more aggressive. They said you need to have some decent acceleration and run it hot to help keep the exhaust cleared. Short trips are the devil.

About to head to Delacroix LA on Halloween towing the 22 Majek Extreme. We will see how it does.

I have around 10k on my '22 and use it like any other vehicle. Short hops city hwy whatever and haven't had any issues so far. I always use the Exhaust brake in auto when running around, and full when towing, which I do a couple times a month, 10k RV. I'm sitting at 22% on my fuel filters, and was told by the dealer take them down to 5% and I'll be fine.

Glad you got your fixed, but dont let them scare you

Well that lasted a couple of days and a couple 100 miles. P2002 code is back and it’s starting the skip/ hesitation between 1700 and 1800 rpm. It hasn’t run a active regen yet.

Well it ran an active regen at 70 mph for about 40 miles. Ran a little better after. Seems to be heading south again.

Aggravating as heck. Truck only has 35,000 on it.

Delete it

I think you’re about to find out why the truck was traded in, it’s got a gremlin.


Not sure what brand of DEF you are using, but I know the duramax hates the expensive “platinum” DEF, try using what Dodge sells for a bit.

I hate what has been done to diesels, I won't own any diesel made after the 7.3l PS

Can’t find anyone willing to do it. Evidently there has been a big crack down on it federally. Not going to do it with a truck that’s almost new.

https://www.roadandtrack.com/news/a...ollar10-million-fine-for-defeat-devices/

https://www.epa.gov/sites/default/files/2020-12/documents/tamperinganddefeatdevices-enfalert.pdf

Everything I looked at or used is the same 67.5% ionized water and 33.2% Urea give or take a percent or two.

Going to get the shop to run another forced regen before hauling the boat 6 hours to Louisiana fishing . It will probably go into limp mode in New Orleans and force us into the hood. Better throw an extra pistol in the truck and a few additional magazines.

I never buy a used truck. All the trucks I owned I brought brand new. Wife hates buying new and taking the out the door hit, she found this one it was immaculate. Price was ok so I thought no issue. Ran perfect for the first 3000 miles.

Then she went out and traded her Ford Edge in for a new Hyundai Sante Fe.

not sure if this will help the current problem but this stuff is good, ran a couple of gals. thru the semi every month, cummins isx/500 hp.
we ran test engines for cummins, they wanted it used.

Endorsed by Cummins for use in diesel engines

https://powerservice.com/psp_product/diesel-kleen-cetane-boost/

I only ever buy used trucks. Never had any kind of problems like this. Also never had any problem selling them for what I got in them because I either get a great deal or don't buy it.

Take it to the dealer - its still under warranty

Ding ding we have a winner. Should have taken it there in the first place. I don’t think DEF is the issue I despise egr and dpf, mostly egr.

Sounds like a sensor..

It’s been at the RAM dealer Demontron Conroe for two weeks. Bumper to bumper is expired on time. Now on the 5/60 power train warranty.

Evidently it had some significant warranty work on it at about 20,000 miles in Louisiana at Allstar RAM in Denham Springs. Apparently according to Demontron the work was done incorrectly. Issues with several of the injectors and they also crushed the oil fill tube. They are working with RAM and Allstar on getting the issues taken care of. Should be covered under warranty but we shall see.

No telling on how all this works out.

Zero codes on the truck and it still had issues that were most apparent at 1700 to 1800 or so rpm.

Should have brought a Ford. Last 5 trucks were Ford. Never took one in for warranty work or had any issue under 100,000 miles.

I had good luck with Ford as well, but all can have issues. I wonder if a previous owner of your ram might have put DEF in the fuel tank, might explain some of the problems.

No telling. Hopefully they get it all worked out this week. During the week I drive a company vehicle. Not having something to drive on the weekends blows.

Got it back today. Everything wrong with the truck was 100% due to the work that Allstar did. Demontrond put one new injector in and reinstalled the others with the correct torque. Service Manager said they were all loose. Runs perfect. 4 mpg increase in mileage.

I talked to the mechanic who worked on it. He said what was occurring was the unit was dumping too much fuel or incorrect fuel mixture and that was causing the hesitation and the DPF and Turbo back pressure issues. The truck didn’t have any diagnostic codes. They looked at the warranty records to see what work had been done on the truck. It had all the injectors replaced at Allstar plus the DPF filter and something else. He said that would have fixed it had the not screwed up the injector work.

Demontrond tried to work with Allstar to get the cost covered. Allstar refused and wouldn’t even talk to them after a couple of calls. I went to Ram customer service. That was a joke. They service rep did get a Tony Buzbee like interrogation from me. She kept telling me the dealers were independently owned. I kept telling her they were authorized by Ram. Finally I asked her “yes or no, can a dealer do anything they want and Ram doesn’t care or have any recourse?” She tried to answer it with something other than yes or no. Finally I got her to say no. “well that’s what is occurring. I recorded it all. That’s legal in Texas. Now I am at the SrVP of Ram Customer Service Experience for North America trying to get them to do the right thing and cover the $1,000 repair. If Ram doesn’t get Allstar to cover it then Allstar is going to get more than $1,000 of hell. I will file complaints in LA. Several of the complaints out there that cause a dealer a pretty good amount of grief. DMV, AG, BBB, etc. One is attached to their surety bond.

Demontrond in Conroe was super to work with. Allstar sucks.

That sucks they wont own up to it, but doesn't surprise me! Glad you got it fixed!

Back in again on Tuesday. This time P2609 code. Intake heater issue. Looked it up and it said it can be a loose bolt that can drop into a cylinder. It should be taken to the dealer immediately. “Small part, Big Problem”.

It’s a relay that’s not working. No voltage coming through it. Next day to get the part. Supposed to pick it up Friday.

Evidently 1 shop day = 5 to 7 driving days. Getting real old. Fast.

Got it back today. Everything is fixed. No codes. Running stellar….knock on wood.