While reading through the PI list in GM SI I found the following Preliminary Information Bulletin #19-NA-212 in regards to a Crank/ No start condition. Evidently there'* been a problem with the camshaft locating pin shearing off in the camshaft sprocket. It goes through several steps after all the usual stuff that is normally checked when encountering this type of fault....spark, injector pulse, fuel delivery and then on to diagnosis leading to the problem covered in this PI.

Here'* a copy of the service bulletin on the following link:

19-NA-212 1..2 (nhtsa.gov)

Wow. That'* a bad one. I have concerns about how this happens at modern GM. Same old shenanigans with different specifics I guess.