I just recently got a set of 4 off ebay for $30 for my 2022 as I bought another set of rims for my summer tires. My local tire guy charged me $60 to install the sensors and mount the tires. Yes, your hand relearn tool will work on them.
Don't know what part of the country that you live in but if you have recently driven in snow/ice conditions and the weather remains cold it could be ice buildup underneath vehicle. Have had this happen on my last two trucks. A 2020 1500 and just recently on my 2022 2500 HD.
My 22 HD came with the winter cover. Currently have it installed. Very easy to install. Has short straps with plastic hooks on them that go throught the grill and hook over the back side. I'm assuming that this is a GM part as it has the bowtie embossed in the middle of it.
I have a 2020 with 53K trouble free miles. Only thing that I have had to do is have a glow plug replaced about 25K ago. I usually trade before now but like this truck very much so I plan on keeping it for at least a couple more years
Does this recall affect the cords for the 20 3.0? I haven't heard of any recall. Don't use mine much but it is nice to start truck and have instant heat.
My 2020 LT also has the garage door buttons in the headliner. I also believe that Convenience package II was required to get them. Not sure if the 2021's are the same.
That's what I'm doing I have an early build 20 with 26K and no problems of any kind. I believe most trucks with this problem are 21's and a very few late built 20's.