Same issue, 2021 Sierra Elevation 3.0 1,200 miles. This is the 3rd time in the shop. They found a bent trigger wheel, its been in the shop for a month waiting on the part. Parts manager just told me the supplier is re-engineering the part and no delivery date. I am beyond frustrated, i have called gmc customer service and been assigned to a "specialist" who never has any updates. Im currently stuck in a small SUV as a loaner. At this point GM service has had the truck longer than i have.