Brought my truck to the dealer 2 weeks ago with the same issue. Truck went into limp mode but after pulling over and turning off and on, it let me drive as normal. check engine light remained on for a day. let it sit over night and started next morning and no CEL. Took it to the dealer and they said valve body needs to be replaced. No idea or clue when it will come in.
Starting to get worried after reading a lot of similar situations where folks have to wait months before parts arrive. Dealer wont provide a pickup truck loaner. Worried I'll be stuck in a chevy cruze for deer season