One problem related to transmission not engage has been reported for the 2015 Chevrolet Tahoe. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Chevrolet Tahoe based on all problems reported for the 2015 Tahoe.
The new 2015 Tahoes have a push button ignition. I pushed off the ignition with the car in drive (forgot to put in park), exited the vehicle and realized the car was rolling down the hill. I quickly jumped in and applied the brakes to stop the car. I was surprised that even though the car is in drive when the car's ignition is turned off, the transmission disengages and the car is in neutral! this is a big hazard. There should either be a fail safe and not allow the car to turn off in drive or automatically place the car in park when the ignition switch is pressed. (this is what happens on a recent model mercedes. ).