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Not sure if a coincidence or what, but I was driving around 50mph, I tooted my horn back at some guy that tooted his horn at me and as soon as I did that a service message came on, followed by a service parking brake message, the little orange service engine light came on, a couple of more lights came on, then within about 5 minutes they all started clearing one at a time but my transmission was shifting real hard.  I got it home shut the engine off, turned it back on, took her for a ride around the block, and it seems ok now….  Anyone else experience anything like this?  I have a 2020 GMC Sierra elevation with the 5.3l motor at about 9,500 miles.

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