NHTSA Complaint #11625289 — 2017 GMC ACADIA

My car on has 54,000 miles on it. For the last two weeks it has started showing that it is not in park when it actually is and continues the warning until I have shifted back and forth at least 4-5 times to clear the message and then able to exit the vehicle. It will roll forward or back to some degree even though it seems to be in park but it messages that it is not. When calling our dealership they do not show a recall and state it will be $180.00 just to look at it, not counting repair for this. there have been no other warning in the system and no accidents at this time. I do have children that ride in this car and could cause a serious situation if the car were to roll or be in gear.