Reading the above posts is not making me feel good. Have a ‘22 Sierra Limited, 6.2 10 speed, 50k miles. At the recommended of the dealer and users here I took it in for routine transmission service (fluid and filter). They finished and it would not go into reverse. Diagnostic says bad solenoid in the valve body. They trying to find a replacement valve body but so far no luck. Has been a week. What is irritating is that I was not having any problems. Take it in for preventative maintenance, not required maintenance, and it breaks.