Marc L

What are the benefits to these? Are there "real" (noticeable) benefits, or do most people put it on for the looks?

Update - Issue resolved. I was sure the problem wasn’t with my trailer since it connected to two other 2020 Sierras. I decided to connect my truck to multiple various trailers (seven and four pin), and my truck registered the connections to all of them. After that, I decided to take a look at my trailer wiring. I needed to find a resolution to the problem! There was some corrosion in the ground for the trailer. I cleaned it up real good and put everything back together, and BOOM! The truck registered the connection! Not sure why the corrosion was enough to prevent my truck from connecting with the trailer and not enough to cause an issue with the other trucks. Maybe the sensors or computer on mine is more sensitive? Regardless, it is fixed and I’m happy.

JohnMr19 - But why on God's green Earth would GM make it so their trucks could only pull trailers equipped with LED lighting systems??? There has to be a problem with the system somewhere; I cannot imagine that GM would purposely engineer their trucks this way. Additionally, there are TONS of trailers still running around with incandescent bulbs on them that are being pulled by these trucks without issue. My dealership originally told me it was a problem with my trailer wiring because their test set didn't detect any problems with the truck. This was a total garbage answer, so I asked if I could bring in my boat trailer to try and see if another 2020 Sierra would recognize it. This truck did not give the same "trailer not connected" error that my truck displays. This truck apparently registered there was a trailer because it went through a series of tests for the trailer's lights. Unfortunately, we were not familiar enough with the trailering app to get past this point. At least we know that another vehicle recognized my trailer and the problem is not with the trailer's wiring, as originally thought by the service department. The Service Manager said that he would be reaching out to GM today to see if they had any ideas on the problem. I also emailed GM Customer Service about the issue. I am eager waiting a response on the issue. I bought a truck with the intent to tow a boat, and possibly a camper as well. As of right now, I have a $65K vehicle that was supposedly built to tow, but is incapable of doing so. I have no use for this truck if it cannot even tow a trailer.

Thanks for posting those pics! Do you have any plans to go with a larger tire down the road? How big do you think you could go on the stock 18's?

Thanks. That's a shame about your situation, I have to believe that GMC Corporate would step in and not only penalize the dealership, but somehow make the situation right for you. I can imagine how hard it is, but try not to let the one bad apple (Auto Nation) spoil the bunch (GMC) for you. I'll post up with the resolution to my situation is (I'm assuming they'll be able to fix it without keeping the truck for 70+ days).

I had the same problem this past weekend on my 2020 Sierra 1500 AT4 (with less than 5,000 miles on it). Hooked the boat trailer up to the wife's SUV, and everything worked great. It was a real bummer that I have a brand new truck that couldn't pull a trailer. I hope the dealership can resolve this issue (my appointment is next Monday). As much as I like this truck, I don't have much use for a truck that can't pull a trailer.