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Just installed an S&B cold air intake #75-5103D with the (white) Dry extendable filter. Got it on amazon for 399$ same price as the S&B website , but shipping took 2 days with prime , S&B wanted 40$ to ship it standard. Installation was easy , and it looks really nice under the hood in my opinion, but better yet I can definitely hear the turbo whistle even more than stock. I still have the DPF and the catalytic behind the turbo so its not a nice full flowing whistle , but its loud enough to make me smile lol. Just wanted to create this thread for those with a Duramax (L5P) that were wondering on this CAI. I recommend It, I know is pricey , but most mods to these truck are. LMK if you have any questions ??

I was excited last April 2023 when my dealer received the 2024 Denali Ultimate 2500 into inventory. My wife and I took it for a test drive and bought the truck that day. Now it's been nearly one year since we bought it and it's done nothing but disappoint. The truck has been at the dealer for repairs for nearly 3 months with every defect related to electrical or software problems and many of these defects haven't been repaired. I'll start off with some of the benign defects, though for what these trucks cost today these defects shouldn't exist: 1. Infotainment system glitches, it will randomly switch between satellite radio and Android audio, the satellite radio loses the signal repeatedly in the suburbs around Chicago (no mountains here). 2. The tailgate Kicker Audio will not disconnect from my phone when the tailgate is closed and the Kicker radio is supposed to be off. The Kicker radio will occasionally play audio when the tailgate is closed. The dealer says to just unpair the Kicker radio from my phone because they can't explain why this is occurring. 3. The wireless charger in the center console is finicky and slow to charge. 4. The now infamous multipro tailgate drop that has caused body damage to the truck's tailgate on 2 occasions and GM still doesn't have a fix to prevent this from happening. The tailgate dropped on us several times as the truck was being driven down the highway and no warning or indication of an open tailgate was ever displayed on the dash. 5. This truck will occasionally suffer the "dead pedal" syndrome; lack of throttle response. Nothing more worrisome than towing a 10,000lbs trailer and having to pull out of a blind driveway on a mountain road and the truck literally will not accelerate. The truck's ECM has yet to record these events. GM's protocol for recording these types of incidences must be very lax. 6. The truck constantly loses communication with the trailer's brakes, resulting in nothing less than loss of trailer brakes. Oh joy, as you're traveling down Vail Pass (7% grade) and your trailer brakes stop working. The dealer blamed a faulty module for this and states they replaced it. Haven't pulled the trailer since this repair so I can't confirm that the defect still exists or not. 7. The traction control on this truck malfunctions occasionally. The traction control will stop working even though it was not manually turned off. As with the dead pedal, the truck's ECM has not recorded these incidences. 8. The truck will consistently die if it is parked for a period of 9 days or less, dependent on the outside temperature. The dealer states that there is nothing wrong and that this truck has to be, at the very least, started everyday and allowed to idle for 20 minutes in order to keep the batteries charged. The dealer has also stated that GM's testing equipment that they must use in order to verify a warranty claim is predisposed to finding no faults. The math for how long a battery should stay charged enough to start this truck is simple; it's an 80 Ah battery and assuming a minimum electrical draw of 50mA to maximum electrical draw of 80mA while the truck is parked the battery should be able to start this truck anywhere from 44 to 67 days. GM corporate has stated to me that they can't validate that my truck has died on multiple occasions, which I find disingenuous, since one of the times it died it sat in the dealership's lot awaiting unrelated repairs and OnStar was notifying me to start the truck in order to recharge the batteries. Apparently GM doesn't find OnStar credible. GMC is refusing to make this right and thinks that having a new truck out of service for nearly 3 months to date is acceptable. Wondering who else may have been experiencing problems with their 2024 Denali Ultimate.

Vehicle Details 2023 GMC Sierra Denali with a LZ0 3.0L Duramax Diesel. It has 7,300 miles in total. Issue DEF Level indicator not reporting proper fluid level. At startup, with DEF tank full, the center dash display shows “DEF Range 200 mi”. If the level drops by one gallon below full, the display shows “DEF Level Empty” and you can not use any of the other center dash displays. It locks the display and only shows “DEF Level Empty”. Appointment With Dealer After arriving for my appointment and explaining the above for the second time, 1 hour and 20 minutes, they said I was all set. They didn’t perform SB # 22-NA-150. They reset the DEF system and cleared its data. This seems to have corrected the issue, but I’m not confident that this is a long-term solution. The DEF level indicator still is reading less than full when the tank is, like it will show no higher than ¾ full. Anyone else having this issue? Any long term fix?

Thought oil pressure was low so when I got home I checked the level, level was fine. However, the oil was black. Dealer did the first oil change maybe 1500 miles ago (only 8900mi on it currently) and the oil is black already. Is that normal? I understand that the black color indicates the presence of carbon and is normal, and does not mean it needs to be changed simply based on color. It didn't smell burnt or "old" either. I really do not run this truck that hard and especially not so during the last 1500 miles. I'm just hoping someone can educate me on the world of diesel engine oil and differences vs gas engine oil. I would expect the oil not to be thorougly black after such a recent oil change.

Hey guys, I have a 2020 Silverado 3.0l Duramax. I'm looking for the gm filling procedure. I wasn't able to find it and was going to try a local dealership for it if this doesn't pan out. I know the temp needs to be brought up and gears cycled through, but I was hoping for an official document for it. If anyone has it I'd appreciate it.

Has anyone found a blanket that fits the lm2 turbo or modified one to fit? Amazon has some inexpensive blankets for other turbos I wouldn't be against modifying. https://a.co/d/8BgHzyR

Idk if this is applicable to everyone else, but I thought only amsoil and acdelco had dexosd light duty Diesel motor oil. There's a whole list of them here. What's everyones thoughts? https://www.gmdexos.com/brands/dexosd/index.html

Dears, I bought my 2017 Chevy Colorado Duramax Z71 brand new and I just love it. I was super satisfied with the performance and features of the truck. Due to the nature of my job, I had to move outside the U.S for a long mission to Africa, so I took my truck with me. Here started my nightmare. Just few days of use, I had the famous warning message regarding the quality of gas (DEF). I changed several brands of DEF but no success! I read somewhere that the shelf life of the product is key for the quality of the fluid. Now my truck is kind of locked, I am allowed to drive 6 Miles/h, it means it is not working. The worse thing is that there is no GM, Chevrolet store to assist. I was thinking to delete the whole DEF system if possible since the location where I am based is not regulated by the gas emissions. I will be very grateful if you could assist as I am suffering without my car. Thanks for your help.

Hello! New to this site and I know this is Probly old news. I swapped out the interior of my 2006 LBZ with a 2005 Escalade platinum which is much nicer than the stock LT trim package. Last week I finally picked up the complete interior wire harness from a parts Escalade that I bought and parted out, the first platinum that donated the interior, the harness had been cut. So finally the heated and cooled bucket seats, (front and back) will work. Yes buckets out back are awesome! Along with the heated and cooled cup holders! Also headrest monitors for the kids! Anyhow just thought I would share in case anyone wants to or tries the swap. Make sure to get a complete harness for the interior. The Escalade packs a big upgrade from the stock Chevy harness. It doesn’t have all the wiring and the pin outs would drive you mad!

So I just got a 2018 Silverado 2500 and am wondering if anyone has experienced this in there’s. when I turn my truck off and then open and shut the door to make the radio turn off I can still hear what I can only assume to be the fan in the radio stay on. If I lock the truck it turns the fan off for a second and then it comes back on. If I push the power button on the radio it shuts off but again comes on. Anyone have any thoughts or does this happen in anyone else’s 2014-2019? It didn’t happen in my 2016 that had the same infotainment center that is the reason for my concern.

new here. just throwing this out there to see if anyone has info on how hard it is to convert the front bumper on a 2006 Silverado 2500HD to a 2018 Silverado 2500HD or what needs to be done to get it done. heres a picture i found on Facebook of it done. just need more info.

Don’t know the rules and regulations round here, just looking to swap anyone for a center console on a 2500hd 2020 for my leather jump seat with storage. email [email protected] thanks Z

Hello Anyone. i have a LBZ Duramax, and i have just put in a new water pump and rebuild the oil cooler and the pipe that connects them i put in after and i pitched a gasket and it eakd then i took it out again and put two non OEM gaskets on there and it seemed to stop leaking when i added coolant but when i fired it all up it pissed out again so my question.. what is the propper way to put the pipe in, i could no imagin putting it in the cooler then putting it back on the truck, do you put it on the water pump first maybe then put it in??? or can you some how use gasket maker instead??? i need help

I know there are a few different forums on this topic, but they seem to have gone dead. The steering in my truck clicks and clunks especially at low speeds, and the truck wanders on the highway. I am constantly holding the wheel to the left or right to go straight. I have had the intermediate shaft replaced per the service bulletin. After it was replaced some of the noises were reduced, but not eliminated and the truck will still not track straight especially at highway speeds. It almost feels like a bad tie rod end or ball joint, but the dealership said everything is nice and tight, and I checked just for my sanity. I also added a steering stabilizer in hopes this would help. Is anyone else having these issues, and have you been able to get them fixed? 2020 Silverado LTZ with 6.6 DuPIT5809.pdframax

Has anyone used this PSI Power Tuner or found where others have used this? I found the product on two different sites; the 2nd URL has better details on the product. I'm skeptical on this product, being that no other tuners have released products for the 3.0L Duramax (LM2). PSI Power 2020 3.0L Duramax Performance Module (Truck Edition) | Thoroughbred Diesel Agricultural Diesel PSI Power Module 2020 3.0L GM Duramax (parleysdieselperformance.com) Also, what about these two products? https://afepower.com/afe-power-50-70064t-momentum-hd-cold-air-intake-system-w-pro-10r-filter#overview https://afepower.com/afe-power-77-44014-scorcher-hd-module#overview And this? https://www.sbfilters.com/cold-air-intakes/silverado-sierra-1500-duramax-3-0-intake-75-5137?variant_id=712

Hi... im in need of the spring arm assembly from a monroe hauler air suspension. Having some trouble locating one.. yes I've called monroe. Yes I've called some junk yards. YES I GOT RIPPED OFF FROM A GUY A DAY BEFORE X MAS SAYING HE HAD 2 OF THEM. YES IM AN IDIOT. I'm giving this one last try before I go ahead and make it 4 link.. she needs to get back on the road asap. Love Ed

Hey everyone, Thank you for the addition to the forum. I just bought my first HD truck and first Diesel vehicle. I bought a 2020 GMC Sierra 2500HD Denali in Pacific Blue. It's a beautiful truck and I love the power of the Duramax. I bought the truck because my wife and I bought a camper this summer that weighs 8,500lb dry and around 10,500lb loaded. My 2019 Ram 1500 Limited with 3.92 gears and air suspension would do "OK" towing it but we want to do more traveling next year so we upgraded to the GMC. I would have stuck with Ram as I loved my 1500 but I am fearful of the Chrysler designed and built transmission for the 6 speed attached to the Cummins. On a side note, it is incredible what dealers are giving in trade in for 1/2 ton trucks. I bought my 2019 Ram limited in June of 2019 brand new for $50,489 and I put 45,100 miles on it in that time and the GMC dealer gave me $46,000 trade in. I got my GMC for GM Employee as my grandfather worked at Fisher Body for 30 years, so there was no fiddling with the trade in value. It does not appear that the market is as hot for 3/4 ton and 1 ton trucks as they are for 1/2 ton at the moment. Below is a few pictures of my new truck, old truck and camper. I am looking forward to learning and chatting with everyone in the group. Paul

https://gmauthority.com/blog/2020/08/2021-chevy-silverado-gmc-sierra-tow-ratings-incoming/ Pretty interesting. I'm not sure it sways my buying decision too much as 9000 is about my limit on a 1/2 ton truck anyway, but I'm glad to see any increase even if I'll probably never use it.

TL;DR: I drove 2,941 miles from South Florida to Southern California in my brand new Sierra 1500 AT4 Duramax and pulled my 4,400lbs pound boat. I experienced no drivetrain issues other than running out of gas which was my own fault. I kep the rpms mostly at 1500-2100, averaged 12.6 mpg, consumed 11-12 gallons of DEF and had no cooling issues under the load and in the 118F heat of the Californian desert for the prolonged time I was driving. The trailering app and trailer tire TPMS system paid for itself and was a great tool for safety! DEF gauge may not be accurate to read when towing, rather go by the mileage warnings that display on the dash. Adaptive cruise control disengaged briefly but was able to re engage after turning the truck off and back on again. I am very satisfied with the performance I experienced and overall truck and have had no issues thus far with the drivetrain (6,054 miles on the clock). Hey y'all, I wanted to put some info out there about the trip I just made this week from Boca Raton, FL to San Diego, CA in my brand new 1500 AT4 Diesel to include performance numbers, issues I encountered, good, bad, and otherwise. I was a little on edge seeing as I did a decent amount of research on the new duramax before I bought it in July and there are definitely some issues out there that are yet to be addressed, however I had to move for my new job so here goes. Google Maps put the trip at 2,611 miles (4,202km) from my parents driveway to my new place but my trip clock read 2,941 miles (4,733km) due to stopping in to see some family along the way. I had 3,110 miles (4,989km) on the clock before I left. Note that my backseat was full of boxes and my bed was mostly empty except a weatherproof toolbox because I don't have a tonneau cover yet and did not want my items exposed to the elements or sticky fingers for the five days I was on the road. I was also towing my boat which is a 20 foot center console on a tandem axle trailer with dual axle hydraulic surge brakes. The boat and trailer combo weighs 4,400lbs (1995 kg) as indicated by the weigh scale I stopped at in California and my WeighSafe drop hitch with tongue scale. I spent the overwhelming majority of my time at ~1500 rpm while on cruise control at 67-mph but would jump to ~2100 when gradually accelerating. I left on Sunday afternoon and drove 225 miles (362km) to Daytona Beach, FL mostly uneventful despite my DEF warning popping up saying I had a 1000 mile range. On Monday, I drove 514 miles (827km) uneventfully seeing some family and friends in the Panhandle of Florida. The only eventful part of this leg of the journey was the DEF message popping up in the morning saying I had a 300 mile range approximately 150 miles after the 1000 mile warning and a speed limited soon message shortly after the 300 mile message. I figured I would use more DEF while towing but I hadn't put much thought into exactly how much I would use while planning my trip. I will talk more about DEF later. Tuesday I drove 537 miles (864km) from Milton, FL to Houston, TX uneventfully. Somewhere around San Antonio, TX I got a message that adaptive cruise control has disengaged. I was able to switch to regular cruise control but still don't know why that happened. I was able to re engage adaptive cruise control later in the day after I turned off the truck at a fuel station. Any thoughts would be appreciated here if you have experienced something similar. Wednesday is where the fun started. About halfway between Houston and Fort Stockton (508 miles, 817km) I got a low trailer tire pressure message on my dash. My truck came with 4 trailer tpms sensors I had installed into 4 new tires on the trailer about a week before I left because I figured why not. the tires are filled to 50psi as per the sticker on the trailer and the message showed front right had 35 psi. I figured all was fine and it was an error message as I had already driven over 1000 miles with no issues but I decided to stop and check at the next exit as I noticed the pressure was steadily declining. I pulled off at a Love's and went to check and could hear the air coming out but couldn't see a nail or feel the air. Regardless (after re parking in the shade at 102F outside), I took the tire off and lo and behold found a 3 inch nail in the tread near the edge of the tire. Within 15 minutes I had it plugged, refilled, reinstalled, and ready to go. That right there ladies and gentlemen justified the $85 I paid to install the sensors. Had I not known of the diminishing air pressure I surely would've had a blowout at the most inconvenient location and had to put a spare on in the heat. So that sold me on the trailer tire TPMS system, cost to install already paid for itself by saving me from having to buy a replacement tire. On Thursday, the plan was to go from Fort Stockton, TX to Tucson, AZ (558 miles, 898km). I was about 30 miles away from my next planned fuel stop when my fuel level low light came on but I didn't think anything of it as I would be stopping about 20 miles before I ran out of fuel. When I pulled off at the only fuel station in the area (Akela, NM) which GasBuddy showed had diesel, I discovered much to my dismay that the station did not have a diesel pump. I knew I was probably screwed but didn't really have a choice but to shoot for Deming, NM which was 24 miles down the road. My fuel level read low so I reduced speed to improve economy and hoped for the best. Worst case scenario I run out of fuel much closer to an actual city which would reduce the time it took for a fuel delivery service to reach me. 5 miles out of Akela, a car flags me down and says something blew off my boat so I pulled over and saw that my bimini top had blown off. I figured my best course of action was to drop the boat on the side of the road and turn back and try to find it. because there was no way I'd make it to Deming after turning around with the boat. Anyways, I had to go back about 3 miles to get the bimini from the middle of the road before going back. I decided to leave the boat, get fuel, and come back for it. The boat has a tracker so I could ensure it didn't get stolen plus i had 2 tongue locks on it. I made it about 12 miles before I heard a sound from the engine that sounded like i hit debris on the road, a message popping up that said speed limited, pulled over and kept the engine idling while I inspected the truck for damage and could see none. I turned off the truck to restart it and try to get back on the highway but it wouldn't crank. I called roadside assistance from the myGMC app and a guy called me to confirm that I needed diesel and was out to me from Deming in about 20 minutes. Fueled up, started, but had a check engine light so I brought it to the Chevy dealer in Deming to get checked out and ensure there was nothing seriously wrong other than running out of fuel. It was just some computer errors from running out of fuel, had them cleared, and left for no charge. Filled my tank at the nearest fuel station, turned around got my boat, and continued on my way after a 3 hour delay and made it to Tucson just in time for happy hour! Friday, I finished my trip to San Diego about 407 miles (655km) uneventfully despite temperatures reaching 118F outside. I was monitoring engine temp which was regulating well between 190 and 205 and tranny temp which kept between 185 and 203 depending on the grade. No issues at all with cooling or performance. Honestly the torque was really impressive on the 6% grade that stretched about 35 miles up and down. By the time it was all said and done, i averaged 12.6mpg for the entire trip although I was getting about 14-16 after I had the bimini top stowed in the bed on the truck reducing the drag of the boat. I had to put in about 11-12 gallons of DEF throughout the trip to top off my tank at the end. I found that the DEF gauge was not displaying accurate levels because when it displayed red Low and no bars it took 4 gallons before overflowing despite the tank being about 5 gallons. The range of the DEF was not linear. It showed 300 mile range at 5 bars but dropped to red and low almost immediately after reaching that point. I learned to go by mile range not necessary gauge level and just fill up at the 300 mile range message. I am satisfied with the fuel economy i saw and was very satisfied with the performance and power available when needed thanks to the diesel. Overall very satisfied with the performance of this truck as I have had no issues with the drivetrain (knock on wood). Feel free to ask me specific questions and I will answer them as soon as I see them!