So I had a similar problem with my 2016 Silverado. I was on the highway and the Speedo went from 60 to 0 back to 60 and then the CEL came on. Had a total loss of power. I restarted the truck and it was OK. Happened a few more times and I would just reset the CEL. It was a lease and I have the truck back but I remember looking into it and back then I had my email setup with Onstar. I got an email I guess when the new owner brought it to the dealership and it said the transmission speed sensor needed to be replaced. Hopefully that’s all you have too. But sucks you have to wait to get it fixed.
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