Does your truck ever go through regen? Mine hasn’t.

KC Desert · November 25, 2019

We have 2500 miles on it and it has never gone into that regen mode or notified us that it has. I even had the dealer run the service bulletin update and we cannot get it to do so unless it is doing it silently and does not notify the driver. Any ideas? How can I tell if it has completed any of these cycles or if there is a problem until one happens as a result of no regens?

joelabq · November 25, 2019

It does not notify you. You might notice a smell, and you will suddenly get crap fuel mileage, easily seen on your 25 Mike mpg estimate. It Regens every tank of fuel I believe, it has for all three tanks on mine. It does not run different while doing a Regen, and no notifications normally.

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Ralph Ciardullo · November 25, 2019

Not sure about GM but at work we have a fleet of Ford 2500 6.7L and ours idle high during regen and notifies you on dash with a blowing image symbol. We drive them mainly in the city and symbol alerts us it's time to take a run on the freeway.

Some of our drivers ignored the regen enterally and within 3 years $7,800 to replace filters and parts.

Edited November 25, 2019 by Ralph Ciardullo

jpgcrna · November 25, 2019

It won’t notify you. On my 2015 my rpm’s at idle would go up and I’d get crap mileage. It would have a dead pedal too.

y 2020 seems to be a bit different but I’ve only had 1 regen I know of so far, it was around 800-900 miles. I could smell it and noticed the crap fuel mileage. I didn’t notice a bump up in idle rpm, or a dead pedal.

GM has said in the past, their thought is that the truck should regen without the driver noticing.

I plan on getting a Banks iDash, if you have one of those, it will tell you when it’s in regen, as well as dpf soot level, etc... pretty useful.

AT4 HD Ron · November 25, 2019

Yea, the regens on the new ones are pretty undetectable. On my 2014, the higher idle was always noticeable, but I have no clue when my 2020 regens.

KC Desert · November 25, 2019

Very interesting, thank you all.

redwngr · November 28, 2019

It won't notify you unless it is having troubles getting successful regened. (and gives the 'keep driving' message)

You dealer can connect to it and tell you how many regens it has done.

If the regen happens when you are on the highway, it's really easy to miss the signs -- unless you are running on a steady pull and happen to be looking at one of the fuel economy screens.

powerhaulic · November 28, 2019

2020 is damn near impossible to tell if it is doing a regen.

My '18 was slightly more noticeable, but much more frequent if doing only short runs.

city or short runs in the '18 regen could happen as often as 150mi, or my longest was 710mi.

My 2020 the shortest (all city) was 525mi, been averaging 750mi between.

CNY_AT4 · November 28, 2019

I regenerated on my drive home from St Louis and the only noticable thing was crap gas mileage. This was around the 800 mile mark

bowtie2007 · January 19, 2020

I have 2800 miles and mine has done 3 regens, each occurring every 800ish miles. The only reason i know is because i use the torque pro app with a bluetooth OBD dongle. I added some custom programs which tell me the soot level and regen status. The custom programs are from a guy on youtube, Chad Ivan. He created the programs based on the small Duramax but it has worked great on the 6.6. The only thing i notice different when the truck is in regen is the instant fuel economy. Normally, when coming to a stop, the reading is 99mpg. During regen, it was 30 to 40mpg. I would have no idea otherwise.

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redwngr · January 19, 2020

3 hours ago, bowtie2007 said:

I have 2800 miles and mine has done 3 regens, each occurring every 800ish miles. The only reason i know is because i use the torque pro app with a bluetooth OBD dongle. I added some custom programs which tell me the soot level and regen status. The custom programs are from a guy on youtube, Chad Ivan. He created the programs based on the small Duramax but it has worked great on the 6.6. The only thing i notice different when the truck is in regen is the instant fuel economy. Normally, when coming to a stop, the reading is 99mpg. During regen, it was 30 to 40mpg. I would have no idea otherwise.

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I've noticed that too.

I also find that if I'm watching one of the fuel economy graph screens, and am running on a 'mostly level' cruise, that the instantaneous fuel economy will run somewhere around 10 mpg less than when not in regen.

I don't track frequency anymore, but when I was they were about 400 mile intervals. More frequent than my LML, but they were shorter duration.

Exhaust also sounds different, but that's tough to notice unless at parking lot speeds.

Currently somewhere over 25,000 miles.

MrGraff · January 22, 2020

Yep 2020 trucks you dont notice it, about the only thing I think I've noticed is the brakes dont seem as easy to stop the truck during a regen. Mileage is probably the biggest give away your in regen.

CNY_AT4 · January 23, 2020

2nd regen today. Noticed it on the way to work this morning, crappy gas mileage while cruising on flat road. Off pedal it would barely make 80 mpg which was a dead giveaway

baker01 · January 2, 2021

My new 2021 3500 just did its first regen at 813 miles,I was in regen for 31 miles and stopped regen at 844 miles. I had the MPG screen up and I dropped from 17 to 8-10 MPG during the regen. My 2018 L5p would regen between 250 nd 600 miles and would be in regen for 17-20 miles.