I just bought a 2012 Sonic LT with 175,528 km on it. Runs and drives nice, but the steering wheel vibrates at idle. The vibration stops as soon as I touch the gas and drive. I mentioned it to the dealer and hope it gets fixed during the safety inspection before I pick it up in a couple of days. Is this a "feature" of electric power steering and what causes it? I've only driven one other car with electric steering before, a 2026 Mazda 3, it it didn't do that.