I have had 3 repair attempts on my 2015 CC Silverado. I have had a consistent vibration at highway speeds. I had to open a case with the BBB after the second because GM refused proceed. After opening the case with the BBB they agreed to continue. They road forced balanced the tires again and used the hose clamp method to balance the driveshaft. The issue is slightly better however GM has refused to continue with any more work. They said any remaining vibration was a "characteristic" of the vehicle. I asked about the house clamps being a temp. Fix and requested a professional driveshaft balance. They once again refused. I am very disappointed, I as well as my extended family have been loyal GM customers for 40+ years. I have a scheduled arbitration later this month. I am so disappointed especially that they will not properly balance / fix the driveshaft.
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