2012 LTZ. Bought it a few weeks back and bought an extended warranty. Last week got the message that the suspension needed attention. Thought my warranty would not cover this repair. Started looking at replacement compressor and shocks. Poured over video's, looked and looked at different brands and pricing. Decided to call the warranty and they will cover that repair. So brought it back to the Chevrolet dealership. Long story shortened...it was non of those components, but it was the Air Ride Control Module. Replaced it and the system works great. In all my searches I never saw anything that referenced this control module. To think I was gonna spend a bunch of money and it still would have not fixed the problem.