2023 Chevrolet Tahoe drivetrain & axles problems

We have a chevy with the 6.2 V8 engine. First we were at a stop light on the highway and the car shifted into Neutral and would not come out for two light cycles. My wife and children were stuck at the light with car's swerving around them at 65+. Finally it shifted into Drive. We called the Chevy dealership and they said it would be a month before they could look at the car and there were no check engine warnings.

The contact owns a 2023 Chevrolet Tahoe. The contact stated that while driving at 40 MPH, a warning message advising to reduce acceleration was displayed, the Check Engine warning light illuminated, and the vehicle stalled. The contact was able to pull over safely. The contact stated that the failure was recurrent. The dealer was notified of the failure and diagnosed the vehicle with a valve failure. No further information was available. The manufacturer was notified of the failure.