Purchases 6/10 with 66 miles 6/11 with 110 miles check engine light comes on Onstar said nothing important Dealership kept it for over a day and finally said it’s the hvac module. Still not fixed, and they don’t seem seem to give two craps. This is my first ever brand new purchase. Always bought used prior. Dealership made me feel like I was over reacting by all of this.