I was pushing the accelerator, and the transmission hesitated at about 45 mph. For about 2-3 seconds, the vehicle would not upshift. The RPMs revved, and finally the vehicle slam-shifted into gear. The vehicle drove normally for the rest of the drive cycle.

With 94 Miles my brand new GMC Canyon AT4 I leased had a catastrophic failure while i was driving it, the front axle essentially exploded. The findings were that their was no oil/lubricant installed in it from the factory which made this happen. I now have to wait many months for the dealership to repair my vehicle while i have a "loaner" with a bunch of restrictions on it. And i have to pay my lease the entire time it is being worked on because of a factory fault. If i had been going more than 25 mph this would have resulted in a crash/injury.

when apply GM update V661.10. tire pressure sensors are wipe out. resulting in 4 flat tire being indicated on the display. GM has no answers for this. this is a safety system that should not be disabled