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Discussion Starter #1
How often will promaster diesel go into regen mode? How to you tell it is in regen mode? I have had this unit since august of 2015 never seen any kind of message that it was doing any thing. Unit has 4500 miles on it almost all highway miles.
 

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If its mostly highway miles you may never get a regen, or at least never notice when it happens. Its the city driving that doesn't heat up the DPF filter enough to clean it out.

When I'm in town I can notice a regen occurring by the sound of both front fans on at full speed. Even with the windows up I can tell there's a different sound. With the windows down, easily heard.

I have been able to tell when a regen is happening at highway speeds mostly be watching the instant MPG reading. Especially if its a flat steady road. Instead of seeing it vary around 24mpg it will be varying around 18mpg. There's been a few times when I've seen that, pulled off at the next exit, and yep... fans are running, regen is going. A bit further down the road and the MPG is back up to what it should be.

Just recently I did get the "DPF regen in progress, maintain safe speed" message, or something like that. I had been driving only in town as a commuter with occasional spurts to 55mph. Had a few days where it started a regen, but it was right as I was coming to a parking space, so it was interrupted. After the 4th or 5th time of that, the regen started on the drive home, I was close to home, but made a looping detour. The regen might have taken 10 minutes.


All that said, I have had the regen start up after plenty of highway driving. Had it a couple times on our 3000 mile road trip. Another time I drove 400 miles of highway speeds to get home. The next day it started a regen less than two miles from home. *shrug*
 

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Discussion Starter #3
Thanks for the information I have heard the fans run loud on mine a few. I though it might have flasehd a message on evic.
 

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The owners who idle a lot or mainly do city driving are in for some grief when the dpf clogs and regen won't clean it. Hard lessons learned from Sprinter owners: do not idle these modern diesels.
 

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That is a hard one for me to grasp. A selling point of the old diesels was that when idling they used 1/6 the fuel that a gasser used and they could idle through the whole tank if you wanted them too.
 

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It is a different beast but some have idled a lot w/o issues. Adrian who has gone to a pickup for more towing often idled for hours, even all night I believe. No one wants a diesel idling anymore anyway! My only concession has been to try not to shut the van off when in a regen and in close to 10,000 miles I have twice taken a 10 minute detour as I approached home to avoid that. It is true when on the road you really don't notice a regen. I have yet to determine how often they happen, never a notice. It is a non-issue for me and I credit the engineering for making it so. Look, this diesel is a great engine to drive and unless you are one of the few who got the CEL it works wonderfully well. Quiet, powerful, fuel efficient, reliable, and by reputation long lived.
 
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It's a cumulative effect. Idling over long periods of time will clog the dpf. This isn't Promaster or Sprinter specific it's a problem with any modern diesel with dpf's.

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