Had same problem with a 2015…
Had same problem with a 2015 Silverado LTZ. Took about a month to repair (not too bad considering it happened during the pandemic). This was the third vehicle I purchased from Marty Feldman Chevrolet of Novi Michigan and at least they offered a loaner and kept me updated through the whole process. Customer service goes a long way in my book and that is what will bring me back to them when I purchase my next vehicle.