Excessive regeneration - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax 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 13 (permalink) Old 07-21-2019, 09:21 AM Thread Starter
 
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Excessive regeneration

So my lml used to go one full tank of fuel to a regen now I see 2 or 3 regens per tank of fuel my driving habit or commute hasn’t changed but noticed recently that my fuel cap when take it off has pressure behind it can’t tell if air is escaping out or in when I take the cap off I do have a fass 165 but they stated that there system doesn’t cause that issue looking for any insight on were to begin

the northeast polar bear
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post #2 of 13 (permalink) Old 07-21-2019, 01:32 PM
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Has your truck been into a GM dealer recently?

2012 Quicksilver SLT CCSB Sub 200mi regen club, fuel guzzling, dealer queen LEMON...

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post #3 of 13 (permalink) Old 07-22-2019, 03:43 AM Thread Starter
 
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Quote:
Originally Posted by Sandman_73 View Post
Has your truck been into a GM dealer recently?
Maybe like 2 months ago when my tcm failed they had to reflash the new tcm

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post #4 of 13 (permalink) Old 07-23-2019, 12:30 PM
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Well that could have something to do with it I have heard of others saying there trucks started having more reigns after an update or reflashing at the dealer my 2012 has always regened more than once a tank full since new

2012 GMC Sierra 2500HD Diesel 2wd Crew Cab. Stock. 200 mile regen club
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post #5 of 13 (permalink) Old 07-23-2019, 06:20 PM
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My 2012 regened once a tank up until ~20k mi when I took it in for something unrelated. Has regened at least twice a tank ever since unless I’m towing heavy. My truck is my daily driver and does a lot of short city trips.

2012 Quicksilver SLT CCSB Sub 200mi regen club, fuel guzzling, dealer queen LEMON...

Amp Powersteps
Insight CTS
305/55/20 Mickey ATZ P3
Bilstein 5100s
Rancho stabilizer
B&W Turnover Ball w/Andersen Ultimate 5er Hitch
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post #6 of 13 (permalink) Old 07-24-2019, 02:03 AM Thread Starter
 
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Ok so I won’t worry too much but still not sure why I take my fuel cap off I feel pressure escaping

the northeast polar bear
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post #7 of 13 (permalink) Old 07-24-2019, 07:03 AM
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I had a similar experience when I signed up for the free onstar trial 2 years ago. GM did some update and pushed it thru onstar. It changed the length of regen. I want to say it was 35 miles for regen to complete on highway, now 26 miles and done. With the 26 my regens are more [email protected] 400-500 miles, whereas the previous strategy was the [email protected] miles. My only issue is that that I am thinking I need to do a manual stationary regen to really clean this thing out, but I only have the Edge CTS (not the 2).
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post #8 of 13 (permalink) Old 07-24-2019, 04:08 PM
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I get 60 to 100 miles between regens when driving full tanks doing short local trips and up to 850 miles towing long distance.

“Insanity is doing the same thing over and over again, but expecting different results.” - Albert Einstein

2017 2500HD GMC Denali CCSB
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post #9 of 13 (permalink) Old 07-24-2019, 06:50 PM
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60-100 miles is WAY too soon. My 2012 would regen every 150-250 miles but I attributed that to a plugged up DPF as the truck saw use in the oil fields for the first 60,000 miles of it's life and likely did not get complete regens done enough. My 2008 would regen every 400-550 miles like clockwork. Generally Once a tank of fuel.

2008 Silverado 2500 Crew Cab Z71
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post #10 of 13 (permalink) Old 07-24-2019, 08:04 PM
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My 2019 will go 80 miles of in-town driving and then a 20 mile drive in the country to regen, so total 100 mile cycle in purely town driving. And I live in a town that has NEVER seen a red light it didn't like.

On the interstate, 74 cruise, the DPF filter accumulates 1 percentage point of blockage per 20-25 miles by the Banks iDash.

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