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Old 07-12-2016, 10:10 AM   #1
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DPF - Diesel Particulate Filter Engines

As I understand, the DPF was required on all diesel engines on MH's built between '08 and '11.
A quick Wikipedia search did not give much info on DPF as it concerns MH's but it did say the filter does need to be changed periodically and I read somewhere that it is expensive to replace, like $7000 expensive.

I would like to get more info on this as this is a year range that I might be interested in. I know the filter can be regenerated and there is a specific procedure to accomplish this, but at some point it is my understanding that it will need to be replaced.

Thanks for any info.
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Old 07-12-2016, 10:24 AM   #2
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Yes the DPF filter can get expensive, my Dad just picked up a 2009 coach that has it. After a manual re-gen that was preformed by a cummins tech at the house, it still wasn't running right, so we pulled the filter and sent it with the tech to put in the oven to be baked. Afterwards it was found that the ceramic filter had cracks and replacement was required. Best price we found for the part was $2k.
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Old 07-12-2016, 10:26 AM   #3
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Unless there is a fueling issue that causes the DPF to clog, beyond the ability of the re-gen cycle to clear it , I doubt that most motor homes would require a replacement of the DPF, in the life of the coach, assuming average annual mileage , of under 12k.
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Old 07-12-2016, 10:54 AM   #4
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Yes the DPF filter can get expensive, my Dad just picked up a 2009 coach that has it. After a manual re-gen that was preformed by a cummins tech at the house, it still wasn't running right, so we pulled the filter and sent it with the tech to put in the oven to be baked. Afterwards it was found that the ceramic filter had cracks and replacement was required. Best price we found for the part was $2k.
Any reason given as to why it had cracks?
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Old 07-12-2016, 11:03 AM   #5
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I can tell you from personal experience and the dumpster full of the filters that they are a money maker for Cummins. Mine cost me a little over 4K last year on my 08. They tried the manual regen and found it cracked.

My rv had been trying to do a regen off and on until it just crapped out and put me into the limp mode. Fortunately Coach Net paid for the tow. Or it would have been a 5K repair.

My extended warranty did not cover anything. I was not happy. My rv only has about 35K miles on it.

They claimed my rv had high idle time. As I did some mental match it is easy to see how one could get to 15% easily. I don't let mine idle more than necessary but short trips allow the math to come out.

A probe was also replaced. I talked to another truck customer there and he said he had gone through two of them and was still in warranty.

A flash upgrade was done on my ecm so the regen cycle should be improved.

If you have a low mileage unit and take lots of short trips it would be worth the 1K to have it taken out and manually cleaned and the ecm updated.

If mine ever fails again it will go into the dumpster and and I will have the ecm reprogrammed. I suspect the mileage would increase a bit too.
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Old 07-12-2016, 11:13 AM   #6
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Well that's kind of scary.

I haven't seen much discussion on this and other forums about DPF problems so I'm hoping your in the minority.
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Old 07-12-2016, 11:29 AM   #7
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Well that's kind of scary.

I haven't seen much discussion on this and other forums about DPF problems so I'm hoping your in the minority.
Go to the little search box above and to the right. Put in DPF and see what comes up.

Based on the dumpster full of filters I would say it is not uncommon.
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Old 07-12-2016, 11:31 AM   #8
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Home Page || Cummins Power Club - The Power To Keep You Moving

For $20 I saved 10% on parts and labor. That saved me about $400.
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Old 07-12-2016, 11:53 AM   #9
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Durham Performance in Weatherford, Texas. Just sayin.
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Old 07-12-2016, 12:24 PM   #10
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The DPF requirement didn't end in 2011. The system is still on all the engines that I'm familiar with. In 2010, the DEF system was added to the mix.
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Old 07-12-2016, 12:31 PM   #11
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The DPF requirement didn't end in 2011. The system is still on all the engines that I'm familiar with. In 2010, the DEF system was added to the mix.
Exactly! Without getting too complicated think of a DPF like a catylitic converter (it's a "thing") and DEF is fluid which is injected into the exhaust. With DEF injection and other changes, the DPF doesn't have to work as hard but it is still part of the emissions system.
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Old 07-12-2016, 12:38 PM   #12
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Google DPF delete, program and a piece of pipe....just sayin

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Old 07-12-2016, 01:56 PM   #13
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Google DPF delete, program and a piece of pipe....just sayin

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Old 07-12-2016, 03:04 PM   #14
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So when I was in business.. we looked at a process to "service/clean" the filters... we were approached by Donaldson with a turn key package that would allow us to remove the filter, run the filter through a cleaning process and oven cleaning process... the filter was run through an oven to turn all the contamination in the filter to ash and than a pulse air/vacuum process to clean it out... Donaldson's program was designed to do the process in about 1/3 the cost of replacement and after sitting down with the people I had decided that if I'd not already decided to retire I would have bought the system and added it our business..

Also the trucks I've owned that have had the filters would go through a re-gen and the engine ECM would send excess fuel down the exhaust stream during freeway speeds to heat the system up... and burn away the contamination...

My current unit doesn't have this... but if it did I'd go looking for someone with either the Donaldson system...
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