Hillsboro Bob

I had the park assist chip installed in my 2022 Sierra. I have been back to the dealership 3 times to get it to work properly and they still cannot do this. It works maybe 1 in 20 starts of the truck. The other times, it makes 2 dinging noises, but stays dark. I am so frustrated with this problem and the dealer telling me "it seems to work fine when we try it." They have had my truck for days at a time and I'm not giving up. I've got 8,000 miles on an expensive vehicle, I expect this stuff to work. Has anybody else had this problem? I know all about using the info. center to turn it on there (I have, again and again) and I have know the owner's manual by heart on this topic.