One problem related to transmission noise has been reported for the 2016 Chevrolet Volt. The most recently reported issues are listed below.
My vehicle was stationary in a left turn lane at an intersection. I took my foot off the gas and pressed the gas pedal to accelerate the car through the intersection. When I pressed the gas, the car did not accelerate. I repeatedly tried to accelerate and the car seemed to not even idle because it would roll backwards when the brake was released. After a while there was some weird noises and the car did some unusual shaking. I also observed on my dashboard that the car was switching between the electric battery power and the gas fuel power. I was not clicking anything to do this it was doing it while I had my foot on the brake and was touching nothing else. After about an hour and many tries the gas finally engaged and I was able to pull the vehicle into a nearby parking lot but there were still various noise problems and shaking. Had the vehicle towed to the dealership to have it serviced. The dealership said the transmission failed and a new one was sent and put into the vehicle. The vehicle only had 1080 miles on it.