My 23 AT4 LZO was at the dealer last Monday and Tuesday for the frequent Regen issue. They had no idea as everything checked out. They opened up an incident report with GM, was told GM engineers have never heard of this issue but are looking into the open ticket. I told them to search RU-vid and message boards that the issue is common. I picked up the truck instead of letting it sit at the dealer while they figure it out. They are getting back with me this week to find out what the GM engineers say.
@@DemonWorks yea the same thing happened with the 2.8 babymax and it took them months (to also believe customers) to release a flash fix that got it back up to ~400 miles per regen.
2024 1500 RST purchased in November 2023 has 3600 miles on it now. Regens are every 130 to 175 miles. My drives are typically about 40 miles on the highway.
My 2023 Silverado 1500 LZO gets me lately 40 MPG less the 65 MPH highway driving but if I go 70 or more MPH I’ll get 27 MPG and I have over 10K miles on it so I notice the more mileage I’m putting in this truck the better MPG I get
Give this a shot, my friend: opt for stock AEM dry flow air filter. Add Hot Shot with every diesel refill and adjust Pedal Monster to city level 5. Equip a transmission bypass block from PPE, and you're good to go. Rege will decrease to 250-350 every diesel refills. I've also integrated VSE's oil catch. With these tweaks, the vehicle runs smoothly, achieving 38 mpg at 25-mile speed setting, 34.7 at 50, and 27.9 at 450 miles. These minor enhancements ensure optimal performance.
stock I had 400-450 miles in between regens and with the few parts I added, I had 400-450 mile regens. Recently the regens started coming along at 100- 200 mile intervals. I'm currently at 200-300 mile intervals. I believe my dash numbers may actually be above yours, I know at least the 450 one is. But those dash numbers realistically mean nothing. Fuel mileage is what one actually gets hand calculating at the end of the tank, thats 22-23 for me in the ZR2. You have a great setup, it's working well !
2024 LZ0 trail boss with 8000 miles and I’m getting regens about every 100 miles now. Definitely was not like this when I first bought it. Had one regen per tank.
Is anyone else having an issue where some of the Regen PID's on their iDash randomly drop off line (no data, just dashed lines). Every so often, maybe 4 or 5 times in the last 5k miles, DPF RG%, DPF SL%, and DPFDIS will stop being reported. Driving a bit more or restarting the engine brings them back online. One time that it happened, I also got a CEL (P2297). To add to the regen conversation, I've been averaging 160 miles between regens. This was almost entirely short distance city driving (23 - 24 mpg). Recently, I did back to back 700 mile highway runs at 65 - 75, with 29 - 30 mpg and 290 miles between regens.
For what it's worth, my LM2 started having more frequent regens (every 200 vs every 400-450 before) after changing the air filter with a GM replacement and following the factory air filter life reset procedure. A few regens later, I cleaned the MAF sensor with CRC cleaner and it seems like things are back to normal.
Mine has average regen every 150 miles since I purchased it on July 4th 2023 just figured it was because of the much smaller filter also on my second L5P and it still averages 400 miles
I have owned my Sierra for four months. it did regens every few hundred miles for the first couple of months. It now does them about every 150 miles or less. It runs great and , no fooling , I have seen 35.3 mpg on occasion , but it's normaly around 24-26 mpg. Smells awful inside the cab when it does a regen .
24' ZR2 here, hardly no regens. @2k miles now and over a half tank of DEF (have not refilled since delivery). I only use renewable diesel so maybe that has something to do with it...
I'm having the same issue. 24 AT4 with 3600 miles on it. Dealer said its regened 19 times. Mine threw code P2463 twice, wont burn off the soot and went into reduced power mode. Dealer said reflashed ECM and replaced an exhaust clamp. We will see...
Mine threw the same code P2463 with only 410 miles on it 24 Denali...took it to dealer, they said it was Catalyst Converter took 10 days for dealer to order parts and repair...now at 812 miles got same code again... my Dealer is F'ing clueless I think...I did a regen with my Banks iDash and cleared the code and it's running fine. I don't think my truck is doing regens at all. The worse of all this is Dealer did a $5037 warranty repair...so much for GM profit margin on a brand new truck. going to another GMC dealer...now I'm hoping it continues so the Lemon law can kick in! This maybe my first and last Diesel truck...even though I love it when it works. It's become a Love/hate issues now!
I just passed 12k miles with my '23 LZ0 I picked up last fall, I have noticed increased oil consumption and regens as well. I do have iDash with logging, I should log my next trip, but it is pretty disappointing and the oil temps really do concern me as well. Getting 238º - 241º F on the interstate and not towing.
Oil temps are fine, these are designed for fuel economy and low emissions, they need higher temps. We have seen no signs of oil breaking down due to the heat, keep it clean and fresh and the temps are a non-issue. Even towing, they stay in check .
I only ever saw 1 regen around the 300+ mile mark, that was when i first installed the I dash. i think timing was coincidental that after install regen distance went down to the mid 1's to mid 2's. Not a big difference from winter to summer diesel that i saw. What seems weird is that driving around in-town seems to load the DPF slower than highway.
24 custom TB LZ0. Just under 1000 miles not getting any notification of regen this normal? Love the way it runs no complaints so far pulls my camper great and millage is good so far.
That is completely normal for a stock truck, I only know when my regen is activated because of my gauges. Stock, you shouldn’t get any notification unless there is an issue. Check out this video for more details This Is REGEN - 3.0 Duramax Diesel ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-DVIgc_7e6BM.html
My LM2 would Regen around 225 miles religiously unless I was towing or working it hard, then I could get 400-600 miles between regens. I switched to a L5P and my same exact driving pattern that would yield 225 mile regens in the LM2 actually get me 550-600 miles in the L5P. Same driving pattern but way different Regen distance. Weird. I assumed the bigger engine would Regen more because I'm not working it hard at all yet I Regen way less in it.
What i found out with my lzo is that everytime i added anything aftermarket like intake or resonator delete ex, it would regen quite frequently, and fuel mileage would drop significantly. These trucks don’t like aftermarket crap. Put everything back to stock and everything fixed itself. But regens were still too frequent for my liking, i switched to amsoil and now my regens are like you said about every 350-400 miles, my lasts regen happened yesterday according to banks idash it was 345 miles. Im telling you try amsoil you'll be very surprised with outcome
This being my 5th 3.0 duramax, 2nd LZ0, I am not on board with the "mods" since my numbers on both trucks with the same mods showing 400+ mile regens. I know amsoil is a good oil, but the list of things that people say it does is incredible. Longer oil change intervals, quieter engine, better mpg, fixes oil consumption and longer regen intervals. I have run amsoil, it's a good oil, it's just not all that. I appreciate the comment, I do not think the change in regens is due to engine oil, however.
@DemonWorks I didn't think intake pipe could destroy my fuel mileage but it did. I've ran acdelco oil Mobil 1 and amsoil on my lz0 and amsoil doubles in regen cycles
Two week old 2024 with 1000 miles. Shortest trips have been 10 miles, other trips ranging between 50 and 400 miles. Regen has been every 250 to 300 miles thus far.
MPG doesn't matter when it's guzzling DEF @ $4 per gallon. There is SOMETHING wrong regardless of whether or not you're seeing a CEL. THAT IS excessive consumption. My 2020 goes through about a tank every 5k miles. THAT is "normal".
What’s my def consumption at? I’ve shown in this channel the differences in def consumption over the years of the 3.0, the 2020 ln2 will use the least amount of def. That doesn’t mean each year after is a problem, just means that the emissions requirements go up each year and gm programs them to use more def.
@@scrooksfulI would say it’s relative to the vehicle. If it’s a vehicle known for consuming, you can’t fault it for doing what it’s supposed to. If you see a sudden change in it, then you know something is up and can look into it.
I think it points to low quality fuel. My regen frequency went down when i changed to a high volume truck stop for my fuel. Also running fuel additive seemed to help as well EDT is my choice due to availability.
I can believe that, in fact, I typically always buy fuel from one station. That same station was where I got fuel from when I had my 400 mile regens... maybe something changed there or their supplier. I will go somewhere else for the next few tanks and see what happens. Thanks for the input !
@Demonworks Also another consideration is winter Blend to summer blend diesel fuels. Suppliers/ refineries will stop adding certain additives in late spring. Also depends on what area you live in. Just something to think about. Keep the videos coming really like your content.
@@israelmoore495 correct, that’s one thing I brought up in video number 2. However, I’ve had a lot of these trucks and never a noticeable difference from winterized to #2. I’m leaning more towards fuel quality with that switchover.
If a bunch of yall are seeing this increased regen frequency on your LZ0's, and it's not some phantom OTA reprogramming by GM (@DemonWorks confirmed it's not), then in my mind the only common thing would be fuel. I would not be surprised if the quality of current production is low. The regions have slightly different blends and additive packages for temperature, elevation, etc. I'm in the Chicago area and haven't noticed a difference, but I also have an LM2, not LZ0. Maybe I'm wrong, I don't know, just a guess.
@@DemonWorksI don’t live in Salt Lake City but I travel there pretty frequently to Huntsman’s and fill up before I head back to Nevada. I fill up at Sinclair pretty exclusively and I haven’t had any change in fuel mileage or regen.
Only the second to point it out… I’m surprised. With the b-roll used, I covered up my constant left turns but also explained in a different comment as to why I’m not in the right lane. Funny what people comment about. I really expected more…
They can be great engines ! The fuel mileage is amazing and the power is great! Take a look around the channel, I share all of my good and bad with each I have had.
How much Def fluid are you using???? Don’t the regens use the def fluid, asking for a friend 🤷♂️🤦♂️😂🏁 I have noticed that when I am in “trailer” mode and/or have my engine braking turned on, that I go through more def fluid. The weird thing is… I have never noticed a difference driving my truck, meaning, when it’s in regen. Hell, I don’t even know how to tell it’s happening. I may need to get one of those fancy Banks thingies!
Hey !!!! Towing will use a bunch of DEF, the regens, not so much. DEF consumption is based around engine load, essentially. If you are not rodding, it will use more def, if you are towing it will as well. Just putting around town, it will use less. Each year, gm programs in for greater DEF consumption to meet NOX requirements.
You pretty much should be unaware of a regen if it takes place while driving on a highway. Here’s a video to help show it in better detail. This Is REGEN - 3.0 Duramax Diesel ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-DVIgc_7e6BM.html
no, the LZ0 engines have been more. my lm2's were about .75 gallons per 1000 miles. The 23 was about 1.25 I believe (i would have to check my notes) and this 24 is 1.5+ per 1000 miles.
Wonder if it’s pump diesel that has changed and not the truck. This seems to be a widespread issue now Has anyone check Air to fuel ratios and learning? Poor quality fuel from distributors along with stricter government regulations on emissions could be causing some weird combustion knock and ignition/injector timing being retarded which would result in less fuel combustion and a richer Air to fuel ratio. This could be fouling the DPF faster resulting in increased regens
I agree that it’s likely the pump diesel. I mentioned that in video #2. I’ve also been watching the air fuel with the banks iDash. It’s not as easy to compare like a gas engine would.
24 lz0 1800 miles regens starting to happen about every 100 miles. Question, i start my truck and my banks reads my def soot % for about a min then it goes away till i turn off the truck and start it again. Iv got the banks on the setting you said (duramax lm2) iv tried other ones, and the soot % will show and stay on but things like the egt or something wont. Please help
Only thing I can suggest is to switch to the first 3.0 lm2 option instead of the second. You lose some trans stuff by doing that. Maybe you already tried that and that’s where you lost egt? That’s what I tell people with this issue, it’s a 23+ issue and seems to be 10% of the trucks get this problem.
Checks out Lmao sounds like my luck. Also do you know anyway of correcting the spedo for larger tires? Thanks for quick response and the awesome videos !!!
you know anything about why apple car play wont connect? My phone connects to truck but wont play apple car play and i have both car play enabled on phone and truck still wont do it unless its plugged in through cable. i have the newest iphone 15 pro max. was curious if you heard anything on that front.
@demonworks have you seen code p2c7a pop up and then go away on its own? popped up when i started my '21 lm2 yesterday. went away today after driving 30 minutes. code shows emission issue
Had it on my LM2 a few months ago. "NOx efficiency below threshold" or something to that effect. My DEF injector was sooted up and spraying an inconsistent pattern. Dealer tech cleaned and tested it and said it'd likely be fine, but they replaced it under warranty because.. why not. Took like 15 minutes to replace after waiting 3 hours for the new injector to show up. Could be same issue on yours, just have your dealer look at it.
Just to show how uninformed I am, I had no idea regens occurred so often. I don't own any of these diesels, so I have no experience with them, but I had thought for some reason that when all of this started that one should be able to expect to go thousands of miles (like 5,000 or even 10,000) between regen cycles. Are even the best of tunes this dirty, are these diesel engines absolutely filthy nasty?? For one, I would think that if DPF's become more frequent it might indicate less efficient regen cycles as the DPF ages. I'm not sure how the 3.0 Duramax fuels a regen, but hopefully it's with a 7th injector. Add a DPF and restrict exhaust flow, perform frequent regen cycles regularly requiring additional fuel and you're taking away from the fuel mileage; diesel has already gotten to be expensive compared to the years gone by (ULSD) and you also have the added expense of DEF for operating costs, along with the extra costs of the diesel option up-front. I'm just wondering how long it takes to break even when going with the Duramax over a gas --- and I know that it all depends on what you use the truck for and how often you haul, how heavy you haul, how fast you drive, hwy vs city, etc. etc. etc. This also doesn't count in the 200,000 mile oil pump belt replacement. Please tell me again why I did want a truck with the LZ0?
Dealership can, but I show in the video that it did nothing for my regens. Regen frquency comes down a lot to driving habits. I was alarmed to my only because my regen frequency suddenly changed.
Very normal for LM2s. I'm about 80/20 highway/city averaging ~25MPG in my RST Z71 and will more often than not see two regens per tank or roughly every 250-260 miles.
Oh, the Charge Air cooler that's been on there for over 6000 miles but my frequent regens started less than 1000 miles ago? Yeah, I guess that could be it. I will ignore the others on here that say they're truck is stock with the same or worse regen frequencies.
@@DemonWorks Not being a jerk , just saying the problems maybe just starting, mine had all sorts of issues starting at 275 miles , and at 36,000 GM finally bought it back, hey run great but when all these problems and there are multiple, it’s definitely not a good vehicle , shouldn’t have any issues for a long time , they cost at least 50k and have all these issues from day one, just not reliable. They should go back to the drawing board or the government needs to get out of manufacturing and let these car manufacturers do what they need to to make a reliable vehicle Come on look what happened to the gas can!
I was waiting for someone to notice that ! Surprised it took this long to notice. I have my reasons to do it on this exact road. It’s pretty much a death highway with people that come out from the right side at any time, there’s always a terrible accident on this road. I will also add that I made a left turn onto this road in the video and held my line while the guy turning right wanted to go well above the speed limit. Hence, hold my lane …
