The contact owns a 2010 Buick LaCrosse. The contact stated that while driving at approximately 60 MPH with the A/C activated, there was a loud shattering sound coming from the roof of the vehicle. The vehicle was steered to the side of the road and inspected, and the contact became aware that the sunroof had exploded. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 250,000.