NHTSA Complaint #10892791 — 2013 GMC TERRAIN

I HAVE A 2013 GMC TERRAIN. I BOUGHT IT USED IN 2014. IT HAD ONE PREVIOUS OWNER. WHEN I BOUGHT THIS CAR, I DIDN'T NOTICE THE ABNORMAL NOISE IT MAKES. WHILE THE CAR IS EITHER IN DRIVER OR REVERSE, IT MAKES A WEIRD TICKING NOISE COMING FROM UNDER THE FRONT HOOD. THE NOISE GOES AWAY IN PARK. HOWEVER, THE NOISE CAN ONLY BE HEARD WHEN THE CAR IDOLS AT A CERTAIN RPM. THE CAR MAKES A RATTLE LIKE SOUND WHEN THE RPMS ARE LOW, LIKE BETWEEN 500 TO 1500. FOR EXAMPLE: WHEN I'M CRUISING DOWN TOWN AT SPEEDS OF ABOUT 25-45MPH, I CAN HERE THE RATTLE SOUND. WHEN I BACK INTO MY GARAGE, THE NOISE CAN BE HEARD EVEN LOUDER BECAUSE THE GARAGE AMPLIFIES THE SOUND. WHEN I USE CRUISE CONTROL TO ACCELERATE, IT DOES NOT MAKE THIS NOISE. ONLY WHEN I PUT MY FOOT ON THE GAS PEDAL. WHEN I TAKE MY FOOD OFF THE GAS, OR SPEED UP, THE SOUND GOES AWAY. IT'S NOT A LOW OIL TICK SOUND. IT'S A LITTLE DIFFERENT, LIKE SOMETHING IS LOOSE AND RATTLING. THIS NOISE HAS ALWAYS BEEN THERE BUT IT TOOK ME A WHILE TO REALIZE IT.