cautious optimist

I'm at 105,000 miles on my baby Duramax. No issues yet. I hit 31 mpg's traveling through hilly terrain to a project in Colorado. I will buy another 3.0. I'm not concerned.

I'm glad you have 14,000 trouble free miles. Frankly though, that's a really low bar. A bare minimum of 80,000 trouble free miles as the norm (rare exceptions always exist) across the whole model year should be a starting point. Good maintenance habits should push these past the 100,000 mile mark with only the most minor of issues. Let's hope GM truly leveled up the quality game with these new engines and exploding engines under 50,000 miles are gone.

My phone (OnePlus) requires a proprietary charger to get the full 80w fast charging benefits. The only option to get these fast charging benefits is a 12v plug. Any other charger and my phone defaults to 25w charging. I also have a tire inflator with a back up 12v plug. USB would never keep that thing going in a pinch. Putting just one in the trucks wouldn't hurt. Good laptops still include at least 1 USB-a port.

This is a really late reply but I just found this thread. They won't sell the hinges. I've gone 7 rounds with them. Their solution is to buy a new cover. I'm about to buy a new cover and it won't be a Bakflip. It also won't be from realtruck.com.

Pictures?

I would not recommend bakflip. My hinges broke and they don't sell replacements. If seems a hard fiberglass cover would be waterproof? Not as convenient though.

I followed up on this thrust bearing issue and it appears this is a 2025-26 issue for the Duramax.

I thought that about "vintage" edition Broncos. Put some $40 steel rims on a Bronco call it a vintage edition and you can charge 28 times the actual cost.

What issues are the 3.0 diesel facing? When I bought mine all my research showed the diesel was the engine most likely to be worry-free, if you use the right oil and only use top tier gas.

Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.

I actually prefer the GMC interior. Gives off mid-century modern vibes.

I never understood the hate for the column shifter. The console shifter just gets in the way, takes up prime cargo space and in my wife's Jeep, the dog constantly bumps the console shifter into neutral! Best choice ever to just make it a column shifter across the lineup and be done with it. (Bonus: Makes swapping from a 5 seater to a six seater far easier)

You nailed it with 6 trims.

Yes! Start/stop is great in theory, but horrible in actual use. Please eliminate that useless feature.

Well I think GM nailed the exterior styling on both the GMC and the Chevy. I actually like the mid-century modern influenced interior of the GMC. Dropping the SLT is a bummer as I thought that was the sweet spot. Hopefully this expands the options available on the Elevation trim. Won't miss the SLE which was just Worktruck+ to me.

I've used my lights a couple times. They're too dim to be worthwhile facing the front. I've folded my mirrors to get some extra light to the side. I'd love a mod to swap them out for something with power. Something to light up the edges of the road to spot deer with shields to avoid blinding oncoming traffic.

I like this as far as the actual truck looks like this. My only negative is the giant L shaped trim below the headlight. It looks like a massive filler. The current truck is too busy with major elements way out of scale. This is a huge step forward in my mind. I hope they don't break the Sierra, but this makes me hopeful that they get that one right too.

2.99 for regular gas 3.79 for Diesel Utah

I pulled up next to a late model GMC Sierra HD today that had a good part of the interior of its headlights painted to match the truck. It was gorgeous! I've seen it on older models but never on these newer trucks. To be fair I don't like the look in bright colors like white, but this was the Horizon Blue and it looked sharp. Mine is Pacific Blue Metallic and I think it would look good. After doing a quick internet search and searching this page I could only find images of the 2014-2018 and older. None in the 2019-2021. I'm seeking pictures if anyone has done this before. Maybe it isn't possible to do this on the newer headlights?

I was aware that they have the side seal. I need both the side seals and now two of the folding hinges. I've done a black duct tape temporary fix until I can buy a new cover. I may go with a shell as I'm finding the covers just don't give me enough room underneath for what I do.

I guess I am using the A/C a lot more than Feb, March and April. I don't idle it to cool it down. No computer codes or check engine lights. I do have a lot of around town driving and shorter trips traveling from jobsite to jobsite. Many of these trips do include about 10-15 minutes on a freeway. A couple 500 mile round trips to visit a project in Colorado in the last few months. I thought to start with cleaning the DPF to see if it's that or another problem.

NICE! That looks good. I agree with Bakflip about it being a liability issue. I was freaked out going down the freeway hoping the air wouldn't catch under it and send that back panel flying. I finally "fixed" it for now with some black gorilla tape just because I was fearful it would go flying. I need something to protect my tools so taking it off wasn't a good option either. The Gorilla tape has held up longer than I expected. It's not my first choice, but until I solve whether to get a Smartcap or another Tonneau, it will get me by.

Great suggestion. I looked a bit on Facebook and other local classifieds. People still want $500+ for used ones where I'm at. I guess that would get me 5 hinges, but still that's a steep price.

Thank you. I'll look into that brand. Lighter weight would be great. My wife and kids can't unfold my cover when it's all folded up.

TL;DL: Seeking instructions on how to clean a DPF on a LM2 3.0 Duramax Diesel. Long version: Hello all. I bought a 2021 GMC Sierra 1500 with the Duramax about 8 months ago. When I first purchased it, I was getting roughly 22-24 mpgs around town. About two months ago, I had to pound the gas to avoid getting hit by a redlight runner. Checking my rear view mirror I noticed my truck had belched out a significant amount of sooty exhaust. It had never done that before or since. Since that day, my mpg's have been dropping. First, I struggled to get it above 20mpg. This last tank it only reached 17.1mpgs. No check engine lights or anything indicating an issue. No major change in my driving habits or regular daily routes. I have no idea when it regens, so I don't know if it goes into regen more often or not. I topped up the DEF at 84800 miles (My first DEF Fill-up), then again at 87450. (2650 miles) Then yesterday at 90560 miles. (3110 miles) So it doesn't appear to be eating more DEF. I've wondered if somehow the DPF filter got clogged with that hard acceleration? I've read that there are cleaning kits for DPF's and I've seen videos on YouTube but I can't find any instructions specifically for how to do it on a LM2. Specifically I'm trying to find which port to use if it can be done. Any help or suggestions would be greatly appreciated.