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  1. Find another dealer! Last month, I got $63,600 trade in for my 2020 GMC Sierra HD Denali with 11,351 miles and diesel engine for a new 2021 model. KBB shows the median trade in value for your 2020 with a gas engine to be right at $50,000.
  2. The navigation sim card is in the center console. I don't know if this sim card is being used for other purposes or not.
  3. Is the Costco discount better than GM employee pricing? I really don't see how that is possible. Investigate. I wouldn't wait. This is the best time to negotiate. The last few days of the year, when dealers are wanting to meet or exceed their year-end sales objective, is the best time to buy.
  4. My truck is white. After washing it and detailing it, the very next day I would always find tiny black spots on it that were stubborn to remove. I've been experiencing these "mysterious tiny black spots" for quite some time and I couldn't figure out where they were coming from. Google and you shall find! https://www.wdbj7.com/content/news/Black-spots-on-your-car-could-be-from-a-nearby-fungus-in-your-mulch-509250841.html
  5. I also have a new 2021 GMC Sierra 2500 HD with the 6.6 liter Duramax engine and I will not use any additive until several hundred miles have been placed on the engine. After 1,000 miles I will "occasionally" use Power Service Diesel Kleen.
  6. Swift is correct. When I bought my 2020 GMC Sierra Denali HD last December, I thought it had Adaptive Cruise Control. I kept trying to figure out how to engage it on the two hour drive home from the dealer. A disappointment for sure since I had it on a 2017 Yukon Denali and a 2019 Jeep Grand Cherokee. It is one option that I miss.
  7. I've had several 2500 and 3500 GM trucks since 2005. Personally, I prefer the AutoTrac transfer case. The 2020 GMC Sierra HD Denali that I currently own has it and it is the first 2500 I've owned that has it. I have no information if it is more reliable or rugged than the regular four wheel drive transfer case, but I know that I don't like the "bucking" that occurs when turning the steering wheel when in four wheel drive with the old transfer case.
  8. It could be any number of things, software, hardware, electrical wiring, a grounding issue. Thankfully, you're under warranty. Take it to a dealer as soon as possible.
  9. I've never towed. So you're probably right. Towing will increase DEF usage.
  10. I think 7 and 1/2 gallons is too much for a 2,000 mile trip. I traveled to New York last month, almost 2,000 miles there and back, and only used about 4 gallons. What really blows my mind is how a mixture of urine and water costs more than diesel fuel.
  11. My 2020 2500 HD doesn't have a key. Just a key fob and a push button.
  12. All of you who live in Democratic controlled cities and states, need to stop voting for the ones who will tax you to death.
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