Having put 145,000 miles on 2011 truck, I become kinda complacent about Active Regens, Just took the attitude of let them do their thing, Soot % usually climbed to 2.77% and regened down to 1.14% and quit.

My 2015 truck has totally different pattern. It started off doing regens in the high 3.xx% and regening down to low 1.xx % range.

But lately My truck keeps trying to do Active regensat extremely low soot levels. Today it went into Active Regen at DPF Soot 1.14% DPF Load of 7% and they run down around .6%

Just seems like the truck is doing more active regens than it needs to.

Those of you with some type of Monitor, What ranges are you seeing your truck regen in?

 

Interesting!! Just my thoughts, not and expert.



I believe it matters what device you use to monitor. I use TP so my numbers (values) are relative to me because I wrote my equation and custom PID.

I use Soot Load % (percent) and Soot Mass (Grams/Litre) that really come from the PCM response from DPF pressure.

I find your post interesting because after I had the TSB recall done my numbers also don’t really match what I expect to see. I’ve been trying to collect data to re-write my equation to try to match a Regen to start at 100% as close a possible. I have a 2013 so it is the only data I can collect easily.

I believe that most Active Regens are activated by the amount of Soot in the DPF or miles. If your truck is going into Active Regen more often and your Soot Load is low, I would expect it was caused by mileage but there is a factor of residual ash left in the DPF among other things that will cause the PCM to do funny things with Active Regens.

So my guess is simply if you are using the same monitoring device on your 2011 and 2015 with the same equation then you might have to update it. If you are using TP then I would suspect the same thing. The PCM has to do self test to verify the sensors are giving correct readings, the EGTs verify with other cold soak EGTs for example. The Soot Load PID comes from a pressure sensor among others and do to ash residual in the DPF the PCM has to account for that and it has to take it into account when the equation for the Soot Load is calculated for an accurate PID Display. With the data I collected it is easier to figure out the PCM programming for when an Active Regen will start because I believe it is a set value, I’m not sure if it is set value to when an Active Regen will stop?

My guess is your values are not from TP, the thing I would watchis that is how many time a Regen starts at the same value. This is what I watch so I can adjust my PID to be relative. Again I’m not an Expert, so I might be corrected.

 

My regen typically starts up when the GPL hits 3.50, and ends around .97. Lately since it has cooled off, regens are starting around 2.50-2.75 GPL and ending at about .97 GLP. Different blend of fuel perhaps?? Or is it the consistently lower engine temps due to the lower ambient temp?

 

Hi, i use scan gauge and my regens start around 3.00 gpl, and end at .89 gpl, and the regens go about 330 miles between, and thats on a 2015 in w.mass. with pm22a to all fuel added

 

I use no additives and just got done towing my 18k toyhauler over 2000 miles.
I use a ScanGuage II to monitor.
My GPL was never above 1.2 or so but had regens every 300-400 miles.

 

I'm using the same Edge CTS that I used on my 2011 Ford. I did update it when I got the 2015 truck. So it should be fairly up to date. At least it has the 2015 code in it vs the original 2010. The Edge CTS reports DPFSoot% ( usually numbers range from 1.xx %to 3.xx%), DPF Load ( With numbers like 5%, 7% ) and DPF PSI ( with numbers like .1)

For past 18,000 miles regens have performed as expected. Active regens typically start in the mid 3.xx% DPFsoot and ended close to 1.00-1.15%

But this last month I'm seeing regens start as mentioned in the low 1.xx% range. The first time or two, I chalked it up to the number of miles triggering an active regen vs the soot load. I even had an active regen trigger a couple of weeks ago as I started towing the horses down to Bryce Canyon. I was loaded up, on the Freeway with EGTs over 750° and my soot was 1.10-1.20%. An area where I would think Passive regen would do any regeneration needed. And it it kicked into active regen and cleaned for 20+ miles down to .6x%

The refineries here do switch over to winter blend fuel October 1st. So maybe that has some effect. I bought the truck in late March, So I've not driven this truck in cold weather yet. So there is a possibility the fuel change or colder temps. I have not switched my fuel additives, Still using Opti-Lube Summer for the Cetane boost and added lubrication.

I finished the school I was building in early September, So I have not been doing the 80 mile daily commute I did all summer. Most of Sept and Oct have been very short trips, just chasing with the occasional hook up the GN and drag the horses up the mountain. So maybe the short trips are giving me more disrupted unfinished regens. But it just seems weird that a interrupted regen would restart when the soot% is so low. My 2011 truck would just run until the trigger threshold was reached again ( around 2.77%)

 

I use a SG II to monitor regens on my 2015. Regens typically start in the 3.50'ish gm/l range and run down to about 0.90'ish gm/l range. They typically happen at 300-400 mile intervals. I did see a regen start once at about 1.20 gm/l while towing the camper in August on a hot day. It lasted the usual 20 minutes or do and stopped in the 0.70 range.

 

I never monitored my 2012, but my 2015 is just like most, regen starts at 3.47gpl and ends around 115gpl.

 

I've been remodeling a neighbors house while I wait for the next school building to start, so I'm working right the street. Lots of short trips and it seems it starts to regen every time I get about 2 miles from home and just pulling into the lumber yard. So yesterday I got fed up with it continually trying regen at 1.14%. So I just got on the freeway and drove 10 miles south and then 10 miles back letting it regen down yo .80%. So we will see if letting do a bigger regen gets it over this "I gotta start now" mentality

 

If it doesn't, another option is to run the manual regen with the CTS. A huge waste of fuel but that'll be one more thing to see if it corrects the need to regen when it isn't needed.

 

I agree with kper05

My truck gets caught in a Regen loop like that when taking short trip and if you have a Distance Since Last Completed Regen" display on the CTS, I would guess that it is not resetting to zero miles.
If your truck was not completed a Regen started by Soot Load a few time (3?), you would get a "Drive To Clean" message. Since your not, the PCM programming is trying to Regen to zero the mile counter or perform a recalibration to verify the DPF pressure sensor is reading properly or account for residual ash in the DPF. I believe that if your truck was having a problem it would throw a DTC and let you know.