This 2015 Jeep Grand Cherokee (WK2) was experiencing a weird buzzing noise at highway speed. The fix was pretty easy to do, but unfortunately, expensive.
Cowl Panel: https://amzn.to/43O6K8q
Wiper arm puller: https://amzn.to/43XO0Uh
Trim sticks: https://amzn.to/43ARQCK
15mm socket: https://amzn.to/3qBXrdt