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About 6sigma

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    United States
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  • Drives
    20 Sierra AT4 CarbonPro Duramax

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  1. I have 10k miles on my 2020 Sierra AT4 CarbonPro I got in early 2020. It's been a great truck, just a few minor concerns/questions. 1. I've had 2 CELs, both some code that has something to do with the brake system. Both went away almost immediately, so never even got a chance to have the dealer look at it. Have not had one recently and I wonder if some software update along the way may have addressed this. 2. I have the adaptive cruise and it works well. My complaint is when traffic clears in front of you, the truck drops the hammer and downshifts to about 4k rpm. The m
  2. I've noticed the UPS and FedEx trucks shut off the engine every time they stop now. I'm guessing they've done the analysis on fuel savings versus wear and tear on the trucks. Or maybe they do it just to signal they are doing something to reduce emissions on deliveries. I've got a 3.0 diesel and I usually press the button every time. Sometimes I forget and when it shuts off I'll hit the button. But I've wondered how much wear and tear on the starter actually occurs versus the fuel savings. There is no real data on this anywhere that I can find. With the DI system the restart is nea
  3. What do you think of the auto stop/start system in these trucks? I'm curious how many just leave it enabled in the default setting or turn it off every time.
  4. I hadn't seen that before, thanks for posting. Good info there. I'm not worried about the oil drive belt at all. I am more concerned about DPF life and overall complexity of all the various control systems. Fortunately there is a 5-year warranty so there is enough time to see if there are common weak spots.
  5. Ft Wayne, Indiana assembly builds some crew short box. I am pretty sure all the CarbonPro trucks are built at Ft Wayne because the carbon bed supplier is very close by. I don't think the engine choice has much to do with where the truck is built though.
  6. I've been thinking about this, but it looks like you have to take the dash apart to install it? How bad is the install? I'm getting better at remembering to hit the button but still forget sometimes, and then it shuts off at a stop and I think I should get the disabler!
  7. Put a couple hundred miles on the 3.0 today. Best MPG over 50 miles was 30.9 according to the computer. I noticed MPG goes down a lot when you get above 75. 80mph is 20-22mpg on the display. Really happy with this truck and engine. Truck is an AT4 with 20" wheels.
  8. Mine seems to regen about once every 10 hours of engine time. Engine time seems to be more accurate estimate of when it might regen than miles, since it depends on how it is driven. I wonder if driven a lot at highway speeds or under load towing that it might get hot enough to do some passive regen? Also I wonder if cold starts produce a lot of soot that might cause the filter to fill sooner.
  9. Thanks, the wheels are the 20" carbon gray that are available with the CarbonPro package. I think the black chrome and black trim looks good with the color. The only thing that doesn't seem to match are the chrome side mirror caps. The technology package actually comes with the chrome mirror caps for some reason. I'm going to look into if they can be easily removed or replaced with the plain black caps. Not a big deal but I'd prefer just plain black mirrors.
  10. Here's a pic of Satin Steel while dirty. Really hides the dirt pretty well. This has a coat of mud/dirt on it (look at the running boards). It is an AT4 CarbonPro so only 3 colors - white, black, or this gray. Really happy with the color so far. When clean it sorta changes color in the sunlight.
  11. I had an 07 Avalanche with 6.0. It was a thirsty dog, not much benefit.
  12. Pretty sure it is the DEF sloshing in the tank. I once noticed something like you described after I topped off the DEF tank and moved the truck.
  13. I think all the CarbonPros are built in Ft Wayne. The carbon bed supplier is located right outside Ft Wayne in Huntington, Indiana. This C&D article says a little more about it. My truck has been great so far - no quality issues yet. I like the idea that the truck is built in my home state.
  14. The LM2 seems to be setup to warmup up relatively quickly for a diesel. I've been monitoring various temps with Torque app and it shows the exhaust temps inc DPF get to 400+F pretty fast (5 min maybe). Oil temp seems to get to 180-190 about the same time as the LT1 in my Camaro. Coolant temp takes longer to get hot though but I think that is by design in the active cooling system. It seems LM2 is setup to get emissions equipment up to temp quickly. Agreed that a lot of short trips are prob not ideal for any diesel though. If you have a lot of short trips I'd make a point to get it
  15. Personal preference, but I found the black chrome trim to look a little off on a black truck. Like it was trying to match but didn't. Not enough contrast for my taste. White paint seemed like too much contrast so I chose the only other color available - satin steel. I think it looks pretty good with the 20" gray wheels. One thing I don't like is the chrome side mirror caps that I think comes with the tech package. It's the only real chrome trim on the whole truck. I think it's just a part of the Tech package that wouldn't matter on the other trucks but on the black chrome CarbonPr
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