I have a 2013 Volt. I often place the car in ACC (or Service) mode when the vehicle is stopped if nothing else but to listen to the radio and operated my windows while sitting in the car. To enter this mode, I simply press the power button without placing my foot on the brake for 10 seconds. A few times now, I forget I'm in this mode and when I'm ready to drive off, I put my foot on the brake, unlatch the emergency brake and put the car into drive (or reverse depending on terrain). To my surprise, there is no power to the wheels or brake (even though the mechanical brake does work... good thing!). This can be scary depending on circumstance since the the accelerator has no effect. Why doesn't Chevy engineering prevent me from possibly having an incident by inhibiting me from coming out of park while in ACC mode?