baker01

2021 3500 HC DRW 4X4. I ran a DEF consumption test. I started with a full DEF tank. I filled the tank slowly to first spit back. I drove until the gauge registered 4 bars down (no towing). I was able to put 2.5 gallons and about a cup back into the tank. I had registered 2250 miles on the trip meter and averaged 14.3 MPG. The DEF usage calculated out to 900 mpg.

My truck went in for the rear window leak in Jan 21 and again in Feb 21. They did not use the bulletin. They stated it did not cover the 21 trucks. It is fixed for now. The second visit they pulled the rear slider and resealed it. They did not replace my steering shaft it is on back order. I have the brake squeal but have not addressed it due to other larger problems. My electronic issues have sent my down the path of lemon Law. Good luck

I don't know if this is your issue but it does not work under 35 mph.

I can lower the seat. Then my choice is comfort vs the inconvenience of the mirror position.

I have the same issue.

They do move. I found the drivers side did not adjust high enough to be useful for me.

I got my truck back from the dealer on 8 Feb 2021. They had it for 15 days and replaced the entire 3rd brake assembly. We had a very light rain for about 15 minutes last night. I had water in the cab again. So three days later and it leaked. I specifically asked the service writer if the checked it for leaks after the repair. I am not happy. I called Chevrolet customer care and opened a case file.

Also joining the club. 2021 Silverado 3500 bought 11 Dec 2020. 5 minutes or rain here in the California desert and it is leaking.

My new 2021 3500 just did its first regen at 813 miles,I was in regen for 31 miles and stopped regen at 844 miles. I had the MPG screen up and I dropped from 17 to 8-10 MPG during the regen. My 2018 L5p would regen between 250 nd 600 miles and would be in regen for 17-20 miles.