2019 Buick Enclave

The contact owns a 2019 Buick Enclave. The contact stated while driving downhill, he shifted to a lower gear and was depressing on the brake pedal however, the vehicle inadvertently accelerated. The contact also stated that the RPM was very high. The contact stated no warning light was illuminated. The contact stated he continued driving but had to stop 5 times to allow the vehicle to cool down. The contact took the vehicle to the local dealer. The mechanic found no failure with the vehicle. The contact stated that the failure persisted. The manufacturer had not been informed of the failure. The failure mileage was approximately 30,000. Contact was on top of Pikes Peak in Colorado. The fast idle has the engine revved to high so that when foot was off the brake on a 5-8% slope the car accelerates to 6500RPM with in 250 feet taking the car to 30MPH in low gear. Consumer had to push on the brakes constantly, all the way down the mountain which caused the brakes to severely overheat. Park ranger measured the temperature of the brakes at 375 degrees F it was after consumer had stopped to allow them to cool 3 times in about 4 miles. The car will idle at 950RPM stopped and will lurch forward when foot was off the brake. Driving on the highway speeds its fine but not on switchback mountain roads.