What 386 owners told NHTSA about the 2018 GMC Acadia

The vehicle has experienced repeated electrical and engine-related malfunctions, including random engine shutdowns while driving and random no-start conditions. The thermostat and cooling system failed and were replaced in 2024. Multiple sensors have failed. The braking system remains noisy even after brake replacement. The lane detection safety system does not provide audible alerts. The vehicle is currently operational and available for inspection upon request. How was your safety or the safety of others put at risk? The vehicle has randomly shut off while driving on both highways and city roads in Azle, Texas. This occurred while my two children were in the vehicle. When the engine shut off, there was a risk of losing power steering and braking assist, which could have caused an accident, especially at highway speeds and in traffic. Has the problem been reproduced or confirmed by a dealer or independent service center? The thermostat and cooling system failure were confirmed and repaired by a service center in 2024. Electrical and sensor issues have occurred repeatedly but have not been fully diagnosed or resolved. Brake noise persists despite replacement. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? UNKNOWN. The vehicle has been serviced by repair facilities, but the manufacturer has not provided a definitive diagnosis for the engine shutdown and electrical failures. Were there any warning lamps, messages, or other symptoms prior to the failure? When did they first appear? Yes. Various warning lights and symptoms appeared prior to failures, including cooling system warnings and sensor alerts. Electrical issues and battery failures have occurred repeatedly, with batteries lasting only 2–3 years. Symptoms began after purchase and have continued throughout ownership. Additional details The brakes have been noisy even after replacement, and the lane detection system does not produce audible warni

NHTSA ODI 11716369

The contact owns a 2018 GMC Acadia C1. The contact stated that his wife was parking in the driveway and upon shifting into the park gear, the vehicle sensor would not register that it was in park, therefore not allowing the engine to be shut off. The contact stated that his wife proceeded to turn the vehicle on and off while continuously shifting the gears until finally placing the shifter into park, and successfully turning the vehicle's engine off. The contact noted that his wife exited the vehicle; however that moments after a loud bang could be heard, and upon inspection, the contact noticed that the vehicle rolled into the garage with the entire front bumper. No property damage was reported. The vehicle came to a stop upon impact. The vehicle was going 3 MPH at the time of the crash. The vehicle did not need to be towed. No warning lights were illuminated however, the "Shift to Park" message will display on the instrument panel. A police report was not filed. The vehicle was not destroyed. The local dealer was contacted however, the vehicle was not diagnosed as the contact was advised that the vehicles VIN was not included in any open recalls. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 90,000.

NHTSA ODI 11673986

IN MOTION ON THE HIGHWAY 401 NORTH ONTARIO CANADA, THE VEHICLE ERRATICALLY INCREASED SPEED AND BRAKES WERE NOIR EFFECTIVE, LOST CONTROL OF THE STEERING WHEEL WHICH CAUSED A MASSIVE ACCIDENT INVOLVING MULTIPLE CARS AND RESULTED IN MULTIPLE INJURIES. *DT

NHTSA ODI 11191133

TL* THE CONTACT RENTED A 2018 GMC ACADIA. WHILE THE CONTACT'S FRIEND WAS DRIVING 40 MPH, THE ENGINE REVVED AND THE VEHICLE ACCELERATED ON ITS OWN. THE BRAKES FAILED TO STOP THE VEHICLE. AS A RESULT, THE VEHICLE DROVE THROUGH A PARTITION AND CRASHED INTO A BRICK WALL. THE AIR BAGS DEPLOYED. ALL FOUR OCCUPANTS IN THE VEHICLE WERE INJURED AND RECEIVED MEDICAL ATTENTION. THE CONTACT SUFFERED CHEST PAIN, ANOTHER OCCUPANT SUSTAINED A CUT ON THE HEAD, AND THE OTHER TWO OCCUPANTS SUFFERED FRACTURES. A POLICE REPORT WAS FILED. THE DEALER AND MANUFACTURER WERE NOT CONTACTED. THE CAUSE OF THE FAILURE WAS NOT DETERMINED. THE VEHICLE WAS DESTROYED AND TOWED TO A TOW LOT. THE FAILURE MILEAGE WAS UNKNOWN. .*BF .*BF 'PARTS OF THIS DOCUMENT HAVE BEEN REDACTED TO PROTECT PERSONALLY IDENTIFIABLE INFORMATION PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).'*JB

NHTSA ODI 11190983