cold and regen
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Junior User
Joined: Apr 2017
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cold and regen
it's been cold lately, lows around 0 and highs in the teens. My DEF has said 95% full for the last 100 miles of driving. I keep waiting for a regen but it never comes.
When it hit 95% full, i purposely stated taking highway trips of at least 30 miles, I figured if the regen came on I would just skip a few exits to let it finish, but again it stays at 95%
Should I be concerned
When it hit 95% full, i purposely stated taking highway trips of at least 30 miles, I figured if the regen came on I would just skip a few exits to let it finish, but again it stays at 95%
Should I be concerned
Senior User
Joined: Sep 2016
Posts: 119
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Don't be concerned with your DEF as that is not a good gauge for Regens. It has been proved with our trucks the DEF gauge can be very slow to report changes in DEF usage and tank level.
If you want to know the actual % of filter, I would suggest talking to your dealer and have the DPF filter % added.
If you want to know the actual % of filter, I would suggest talking to your dealer and have the DPF filter % added.
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Junior User
Joined: Apr 2017
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Oops, I didn't mean DEF, I meant my DPF gauge (too many friggin gauges). I had the particulate filter screen turned on at the dealer. During the summer, it was pretty easy to predict when I would regen. At 95%, after about 10 miles on the highway it would go to 99% then regen, now it's just sitting there.
Senior User
Joined: Sep 2016
Posts: 119
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That makes more sense. How long did you drive the truck this last time? The regen process will not start until the truck is up to temperature. I find in the cold weather that can take a very long time. Maybe take a longer trip and get it up to temp and see what happens. Otherwise it might be worth while to take it to the dealer.
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Junior User
Joined: Apr 2017
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I was thinking the same thing. It defiantly takes a while for it to heat up. The last time I tried, I let it idle for about 20 min. By the time I got on the highway the engine gauge said it was up to normal, then I drove about 30 miles on the highway, and still nothing, then I ate dinner and drove 30 miles home, so the engine was still fairly warm.
It's not a daily driver, so it sits. I try to make sure I drive it on the weekends at least 100 miles a week.
It's supposed to get in the 40's on Sunday, I may just let it sit until then, plug it in Saturdays night, then drive down the highway on Sunday to see it that kicks it in
It's not a daily driver, so it sits. I try to make sure I drive it on the weekends at least 100 miles a week.
It's supposed to get in the 40's on Sunday, I may just let it sit until then, plug it in Saturdays night, then drive down the highway on Sunday to see it that kicks it in
Mountain Pass
Joined: Apr 2017
Posts: 129
Likes: 14
I am not certain that I have ever seen my dash indicate the truck was "cleaning the exhaust filter", although it's easy to miss. Is there any way to check to see if the truck is performing the regen/cleaning process?
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Fleet Mechanic
Joined: Jan 2015
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From: SE Michigan
Originally Posted by Owenage
Don't be concerned with your DEF as that is not a good gauge for Regens.
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Fleet Mechanic
Joined: Jan 2015
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From: SE Michigan
Senior User
Joined: Aug 2017
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From: Rush
You can buy an ODBII dongle (I use the ODBLink MX Bluetooth model from Amazon) and the FORScan app (forscan.org) to monitor most any PID the truck puts out. There is a PID specifically for whether or not the truck is in rengen (Active or Off). You can also monitor EGT temps (they go way up when in regen mode). Another alternative is to purchase an aftermarket Edge controller Edge controller.
^^^ What he said or you will be doing nothing but guessing. My truck has done 5 regens now at way less than 100%, dont rely on that gauge.
Senior User
Joined: Mar 2017
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its -40C or -40F were i live and my truck regens u can really tell when it does theres smoke everywhere behind me. and has the smell. and my dpf screen always stays at 0% since it got cold and still regens no issues
Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
Lies.
It seems DPF regen happens when it hits 100% DPF soot OR, at about every 500 miles. During really cold temps, when it doesn't see the exhaust temps, it just does a regen anyway to avoid plugging it up. In these instances, it seems it doesn't turn down the Soot to 0% either..... Like an over ride to protect the DPF.
This explains my last long cold trip, it regenned at beginning and stayed at 0% soot, the whole trip, but did regen at the end going by fuel consumption. still at 0% for s verbal days after, and then it started to go up in soot %
This explains my last long cold trip, it regenned at beginning and stayed at 0% soot, the whole trip, but did regen at the end going by fuel consumption. still at 0% for s verbal days after, and then it started to go up in soot %
Tuned
Joined: Mar 2004
Posts: 358
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Mine has been sitting at 60% for a week now. I have been instead watching for the 500 mile mark which is where mine has done it most of the time. I took it for a 30 minute drive when I thought it was close. Ran it in 4th gear to keep around 1800 RPM so I knew the exhaust was hot enough. Its been stupid cold here below zero every morning and highs in single digits. Pretty sure it did a regen because i usually notice in when I let off the throttle and how fast the turbo builds when I hit the throttle again.
After this, I have sworn off even looking at the DPF % until it gets above freezing. Just going to let the truck do its thing.
After this, I have sworn off even looking at the DPF % until it gets above freezing. Just going to let the truck do its thing.
Senior User
Joined: Aug 2017
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From: Rush
Mine has been sitting at 60% for a week now. I have been instead watching for the 500 mile mark which is where mine has done it most of the time. I took it for a 30 minute drive when I thought it was close. Ran it in 4th gear to keep around 1800 RPM so I knew the exhaust was hot enough. Its been stupid cold here below zero every morning and highs in single digits. Pretty sure it did a regen because i usually notice in when I let off the throttle and how fast the turbo builds when I hit the throttle again.
After this, I have sworn off even looking at the DPF % until it gets above freezing. Just going to let the truck do its thing.
After this, I have sworn off even looking at the DPF % until it gets above freezing. Just going to let the truck do its thing.
You are going to find out that in cold weather its going to regen every 500 miles just like mine has been doing, makes it very easy to predict. Ive been saying for awhile if you are using that dpf% screen to catch your regens you will be way off base. It is also not a good gauge in summer if you tow alot as the dpf% will drop as you build exhaust temps while working it hard and it will use either the soot gpl or mileage to trigger the regen. Im saying this because I beleive people are thinking that dpf% screen is the end all gauge to monitor for regens and it is not.