Distance between regen - Chevy and GMC Duramax Diesel Forum
2017-19 GM T-K2 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 42 (permalink) Old 06-25-2019, 09:40 PM Thread Starter
 
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Distance between regen

I understand there’s several things that factor into regen cycles. Does anyone know what the average/normal distance between regen’s should be? My truck has been in and out of the shop all of its 8500 mile life. I just got the truck back from the dealership and getting 281 miles between regens with regens taking 35+ miles to complete up to 75 miles a few times. When I drive the truck it’s 14 miles of freeway and 1/2 mile city driving to work. In its life the truck has been in regen over 24 times now.. I’m not crazy and counting cycles- one of the times the tech showed me the read out.
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post #2 of 42 (permalink) Old 06-26-2019, 03:35 AM
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My 15 lml regens about every other tank of fuel maybe around 8 to 1000 miles maybe a little more if that helps

2015.5 gmc Lml 2500 slt double cab no modifications
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post #3 of 42 (permalink) Old 06-26-2019, 04:02 AM
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Lml and l5p are completely diff. The l5p regens more often than the lml. Cant compare the 2.


How much idle time does the truck see. Idling will drastically change distance between regens. With the driving I do. Sometimes I see more around town and sometimes it's more interstate. I have seen anywhere from 180 to almost 600 between regens.

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post #4 of 42 (permalink) Old 06-26-2019, 05:46 AM
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Those short commuting trips aren't helping it. It needs enough time to complete its regen, or else it will constantly be trying to finish. Whenever my wife drives mine on her short work commutes, it seems to constantly be in regen.

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post #5 of 42 (permalink) Old 06-26-2019, 05:47 AM
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My 2018 is running about 600 miles between regens consistently. I have extremely limited in town driving so it is almost all either interstate or rural roads and highways with little traffic.

14 miles is a pretty short trip for diesel truck standards and mine doesn't come up to full operating temperature until at least 5 miles and more when it is cold. I suspect that has a lot to do with your shorter time between regens.

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post #6 of 42 (permalink) Old 06-26-2019, 07:13 AM
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I am aware that it’s a different duramax it was just for comparison

2015.5 gmc Lml 2500 slt double cab no modifications
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post #7 of 42 (permalink) Old 06-27-2019, 06:40 PM
 
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My fairly new 19 3500HD rarely goes into regen. I have only been running the higher cetane renewable 99 fuel since it was new (its available at a nearby station and happens to be less cost than diesel 2). I also have used very little DEF as compared to my 16. Anyone have experience with R99 fuel perhaps using less DEF and running cleaner with less regens?
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post #8 of 42 (permalink) Old 06-27-2019, 10:15 PM
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How have you determined the amount of def used?

2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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post #9 of 42 (permalink) Old 06-28-2019, 09:32 AM
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One thing to consider... your short trips are clogging the DPF up much faster than someone doing highway miles. There is a way to combat this and help keep the regen's further apart and shorter. I experienced your same issue as I drive 20 miles to work (70% at 55mph). My regen issue got really bad, so I looked for a way to beat it. What I have been doing since then is using the Lucas Diesel fuel treatment that cleans the fuel system, and cleans the DPF out. I have never had an issue since using that (do one cleaning at each oil change) and my mpg is back up to where it was when newer. I would go this route and you should be able to get back to normal.
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post #10 of 42 (permalink) Old 06-28-2019, 10:59 AM
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Quote:
Originally Posted by diesel_tech_02 View Post
One thing to consider... your short trips are clogging the DPF up much faster than someone doing highway miles. There is a way to combat this and help keep the regen's further apart and shorter. I experienced your same issue as I drive 20 miles to work (70% at 55mph). My regen issue got really bad, so I looked for a way to beat it. What I have been doing since then is using the Lucas Diesel fuel treatment that cleans the fuel system, and cleans the DPF out. I have never had an issue since using that (do one cleaning at each oil change) and my mpg is back up to where it was when newer. I would go this route and you should be able to get back to normal.

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