One problem related to tail light switch has been reported for the 2020 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 GMC Sierra 2500 based on all problems reported for the 2020 Sierra 2500.
As I was driving home my check engine light came on and all of my lights went out. I had no tail lights and the radio started saying no signal detected. The dash screen was saying service keyless entry system. And I had no running lights but my headlights. Pretty scary thinking no one could see me as they were driving behind me at a high rate of speed. My truck only has 200 miles on it so this is really scary to be having issues so early in the ownership of this truck. I've always had fords but this truck caught my eye and I stepped out of my comfort zone and now wishing I would have stayed in in.