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Old 02-10-2018, 04:06 PM   #1
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DPF, Frequent Regen Cycles

Last year when I had some issues with the exhaust gas pressure sensor, the Cummins shop that corrected that issue (tightened the sensor, tested system) said their PC analysis suggested my DPF was getting near end of its life. This particular shop said they had the device to 'clean' it but, at 10 years old, the shop manager suggested I just replace it when it fails.

No issues until this current trip when we had a regen (I get a 'Hot Exhaust' light on the dash during regen cycle) in the first 2,000 miles of our trip. That was a month ago when we were heading to Texas. Today, I get another 'hot exhaust' light and it stays on for about 20 minutes. Then, later again today I get yet another 'hot exhaust' light (probably 6 hours into a 7 hour trip). This second cycle lasted about 30 minutes.

So, I am thinking the DPF is clogging up and the regens are not getting it clean. Anyone else have similar symptoms and, if so, how long after did it fail or get replaced?
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Old 02-11-2018, 07:28 PM   #2
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If the DPF is in fact clogging up, it will just continue to get worse. Strange that it could not be cleaned. We had an electric oven that we would put them in if they were clogged and would not clean up to specs with just the air blast.
I would suggest trying another shop that cleans all makes of DPF's.
If yours needs the oven treatment, it will likely take 2 days. They have to be heat soaked for a number of hours.
Happy Glamping.
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Old 02-12-2018, 05:59 AM   #3
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If the DPF is in fact clogging up, it will just continue to get worse. Strange that it could not be cleaned. We had an electric oven that we would put them in if they were clogged and would not clean up to specs with just the air blast.
I would suggest trying another shop that cleans all makes of DPF's.
If yours needs the oven treatment, it will likely take 2 days. They have to be heat soaked for a number of hours.
Happy Glamping.
I plan to talk to another shop. The service manager at that particular shop did not say he could not clean it but suggested it was not always money well spent. I will get another opinion.
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Old 02-12-2018, 06:48 PM   #4
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Mine did that, turns out the unit was cracked and no rebuilts were available. Something like $3,500 as I remember but it was done as part of the repairs for the broken valve.
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Old 02-12-2018, 07:25 PM   #5
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Mine did that, turns out the unit was cracked and no rebuilts were available. Something like $3,500 as I remember but it was done as part of the repairs for the broken valve.
Last year the folks at Cummins told me the new DPF for mine was about $2,650.
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Old 02-17-2018, 04:31 PM   #6
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Just went and looked at my bill from April 2015:
List price is $3,043.35 and a unit price of $2,493.89
Core charge of $1,450 then removed the core charge.
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