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December 8th I was getting into my 2020 Sierra AT4 and I noticed all of the windows were down and the mirrors were unfolded. The truck is kept in my garage and the mirrors need to be folded to get in. It is also asking for my password to be able to connect devices but does not recognize my...

Correction, I used 7.5 gal. DEF. I took it to my dealer last year for this problem, they replaced a sensor that they said had shorted out . Under warranty.

Every time I tow I get this message. I just returned from a trip towing my toyhauler (7,200lbs). 1,524 miles 5.5gal of DEF. I got the first low def message at 500 mi. added 2gal and it over filled. Next morning no fault level read full. Next 500mi. Same thing. Next 500mi. message says 0 Def...

4.89 in Pentwater, Mi.

Just had first oil change at 6,000mi. everything looked good.

Does anyone know the Part# for the power cord to plug in the block heater?

I have a 2020 Sierra AT4 1500 with the DuraMax. I pull a Coachman Adrenaline 19CB. Dry Wt. is 6,230lbs. Loaded up with Motorcycle it weighed 7,235lbs on my last trip. Traveled to Northern Michigan (Petoskey) pretty hilly, averaged 12mpg. Does a good job at 60mph will go as fast as you dare on...

7,230lbs with the bike.

I have 4000 miles on my AT4. I have towed my toyhauler 1300 miles. I have added 7.5gal of DEF. It really uses the DEF while towing.

I have 4000 miles on my AT4. Best 30mpg, Avg 23mpg. Towed toyhauler @ 7230lbs 400 miles round trip Averaged 10.3mpg.