Usually after 3 repairs have been made for the same problem and the issue is still there you would be covered under the lemon law. Each state is a little different on how they determine what repairs a vehicle needs to qualify for the "lemon law" so make sure you look up your states info. If the dealership can't or won't fix the problem and you decide to go the lemon law route I highly recommend using an attorney who specializes in lemon law cases. They don't charge you money and they don't take money from your settlement, GM reimburses them 100%. I used an attorney to get GM to buy back my 2012 Cruze which had alot of electrical problems. I was paid back every dollar spent on the vehicle including taxes, registrations, payments, etc.
I would try again to get the problems fixed, but if they don't go away then a buy back from GM would be a good idea.
I would try again to get the problems fixed, but if they don't go away then a buy back from GM would be a good idea.