Mine changes between main radio screen and preset screen. It happens randomly every 1-2 weeks (but when it does it, it does it for as long as the truck is running). I made a video when it was misbehaving and took it to the dealer. They did a software update which didn't fix it. They are now ordering some type of control module for the screen (it has not been done yet so I do not know the exact part). I have an extended warranty which is paying for the new part. There are other threads showing this type of problem, but no good solutions/resolutions are mentioned.
Here is another one. 2017 6.2/8 speed. At 25,000 miles replaced torque converter. Now at 56,000 miles it started shuttering again. Yesterday they replaced ATF with a "machine they got from GM". Today doing much better. We will see how it does over the next several thousand miles
The weathertech floor mats will slide right under the storage bin. The bin is great.
My local Mobil has 93 premium with 10% ethanol and 89 ethanol free. I get my best gas mileage from the 89 (22 mpg driving 75-80 with 6.2 NHT). Ethanol free gas has more BTU's (energy) per gallon than 10% ethanol gas. For the same price, I would use 91 ethanol free.
I have 2017 Sierra 6.2/8 speed NHT that developed "the shudders" at 25,000 miles. They changed the transmission fuid but no change. Torque converter was changed 2 weeks ago. Now it is incredibly smooth. There still occasional light clunks between 1-2 gear in parking lots, but I think most 8 speeds do that. I read somewhere that when making the torque converter, the manufacturer was damaging an internal seal and fluid was not flowing properly and that the new torque converters have a different part #. I'm not sure if all of that is true, but I would hate to have to replace torque converters every 25-50,000.
I have a Sierra SLT 1500 6.2 8 speed. I drive 70-80 mph on highway. My truck runs fine on any octane rating though I use premium when towing. Using 93 premium 10% ethanol my high mileage is 21. Using 87 regular 10% ethanol my highway mileage is 20. Using 89 midgrade ethanol free my highway mileage is 22. The 89 ethanol free costs the same as premium, so that is what I usually run since it is more efficient. The cheapest cost per mile is with regular 10% ethanol. Ironically, I had a 2014 5.3 6 speed that only got 19 mpg highway using regular!
An update to my truck. 2017 6.2L NHT Sierra. It started shuddering after 25,000 miles (and a week of towing). First the dealer changed the fluids and I drove it 200 miles. No change in the shudder. Last week they changed the torque converter. It was at the dealer 4 days and they listed 21.5 hours of labor on the warranty claim!! It now is smooth as butter. Still an occasional clunk when cold in a parking lot (another 8 speed issue). Love my truck again.
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