I have a 2024 GMC Sierra…
I have a 2024 GMC Sierra with 6100 miles. 3 times it runs at reduced engine speed and the transmission shifts really rough. Also wouldn’t go into reverse. Dealers says parts are ordered and it’s been over a week. Truck is not driveable. I drive long distances for work and afraid now even after if/when fixed it will be reliable. BTW switched from a RAM that I never had one problem with.