Sorry, 2018 Hybrid. I don't know the codes it threw. The service tech was not very specific. They originally said the drive motor had to be replaced, then said GM recommended the entire tranny be replaced. Should be done by Tuesday. The interesting question is under what part of the warranty is this covered? The drive train or the hybrid component portion? The warranties I believe are three years longer for hybrid component part.Just to make sure, you have a hybrid? One of your new posts indicate a 2018 Hybrid then this post says 2017.
The shift to park issue manifests 2 ways. One, all trims (Hybrid/LS/LT/Premier) can get and is just a problem of the BCM receiving a park confirmation signal. The fix for that is wiggling, clicking, or replacing the shifter. The other is unique to the hybrid and produces the same error and a specific code. If it tosses that code the whole drive unit/transmission needs to be replaced. I believe this is only the 3rd time I have heard of this on the hybrid. Good it was under warranty!