NHTSA Complaint #11072911 — 2017 GMC ACADIA

THE ADAPTIVE CRUISE CONTROL (ACC) IN MY 2017 ACADIA DENALI WILL SHUT OFF AND EVEN CAUSE THE VEHICLE TO BREAK FOR NO REASON. THIS HAS HAPPENED NUMEROUS TIMES, EVEN WITH NO OTHER VEHICLE ON THE ROAD OR OBSTACLES IN THE ROAD. WHEN IT HAPPENS THE ACC WILL SHUT OFF, YOU WILL HEAR TWO DISTINCT CHIMES AND YOU WILL SEE A MESSAGE SAYING, 'ADAPTIVE CRUISE CONTROL DISENGAGED'. AFTER THIS HAPPENS YOU WILL NOT BE ABLE TO REENGAGE THE ACC AND IF YOU TRY THE VEHICLE WILL DISPLAY A MESSAGE THAT SAYS 'TEMPORARILY UNAVAILABLE.' I HAVE HAD IT TO THE DEALERSHIP NUMEROUS TIMES AND THEY HAVE STATED THEY DON'T KNOW WHY IT WOULD HAPPEN, AND CANNOT DO ANYTHING UNLESS THEY CAN DUPLICATE IT. IT HAPPENS A LOT BUT THE DEALERSHIP AND GMC SAY THERE IS NO PROBLEM. THE FIRST TIME THIS HAPPENED IT ALMOST CAUSED MY WIFE TO WRECK, SINCE THE ACC SHUT OFF AND APPLIED BRAKES WITH NO OTHER CAR ON THE ROAD, BADLY STARTLING HER, AND SHE THOUGHT SHE HAD HIT SOMETHING. I EVEN HAVE A VIDEO OF THE ACC SHOWING 'TEMPORARILY UNAVAILABLE' AFTER ONE OCCASION IT SHUT OFF AND SLOWED THE VEHICLE. IN THIS INSTANCE THERE WERE NO CAR IN FRONT OF ME OR ON EITHER SIDE, BUT THERE WAS ONE BEHIND ME WHO I AM SURE WAS NOT HAPPY WHEN THE VEHICLE IN FRONT OF HIM BRAKED FOR NO REASON. A GMC REPRESENTATIVE TOLD ME I CAN HAVE ALL THE VIDEO I WANT, BUT IT 'DOESN'T MATTER AND WON'T CHANGE ANYTHING'. THE DEALERSHIP DID DO A COMPLETE DIAGNOSTIC ON ONE OCCASION AND FOUND EVIDENCE THAT THE ACC HAD SHUT OFF, BUT THE CODE DID NOT SAY WHY IT SHUT OFF. THIS HAS HAPPENED AT DIFFERENT SPEEDS RANGE FROM 55 TO 75 MPH. WE HAVE HAD IT HAPPEN THREE TIMES IN A 30 MINUTE PERIOD AND DROVE FOR A MONTH WITHOUT IT HAPPENING. THIS CAUSES AN UNSAFE DRIVING EXPERIENCE AND SHOULD BE FIXED OR THE VEHICLE REPLACED. I HAVE FOUND OTHER PEOPLE ONLINE WHO HAVE EXPERIENCED THIS, BUT THERE ARE NOT ENOUGH OF US TO WARRANT GMC DOING ANYTHING.