2017 Buick Enclave UNKNOWN OR OTHER

The engine light has come on and a diagnostic check has been made and I was told it needed the transmission replaced. This car has only 112,000 miles on it and has been maintained. Why would there be transmission issues with low mileage?

HEARD A RATTLE OR FLUTTERING SOUND COMING FROM FRONT AREA OF ENCLAVE, TOOK TO DEALER ON 12/21/2017 AND WAS INFORMED AFTER HAVING A TEST DRIVE AND INSPECTION ,SOUND WAS AN A/C HOSE CONTACTING ANOTHER HOSE , DEALER IN BUFORD ,GA STATED ISSUE WAS REPAIRED. WHILE TRAVELING NORTH 12/26/17 ON INTERSTATE 85 AT APPROX. 65 MPH AND HEARD THE SAME SOUND AGAIN ONLY NOT AS LOUD CONTINUED ON TO NASHVILLE TN , WHILE TRAVELING ON NORTH ON 12/27/17 HEARD THE SOUND AGAIN ON KEPT GETTING LOUDER ,THIS TIME WAS ABLE TO SEE A SMALL BLACK OBJECT FLAPPING IN THE FRONT OF THE SUV. WAS ABLE TO PULL OFF AND UPON LOOKING AT FRONT OF MY SUV SPOTTED THAT THE BUG GUARD WAS LOOSE AND AN APPROX. 3 INCH PIECE WAS MISSING FROM BUG GUARD. VERY DISAPPOINTED THAT THE GUARD WAS APPLIED WITH JUST ADHESIVE WHEN PURCHASED FROM THE DEALER. NOW FRONT OF VEHICLE HAS PAINT AND METAL DAMAGE FROM THIS CHEAP GM BUG GUARD!!! IN MY OPINION THIS IS A CHEAP PRODUCT THAT GM COMPANY IS OFFERING TO CUSTOMERS WHO PURCHASE THEIR VEHICLES!!

AT SLOW SPEED JUST STARTING AWAY FROM TRAFFIC LIGHT IN BROWNSVILLE TX, THE SUNROOF EXPLODED. GM SAYS NOT WARRANTY ISSUE