I have a 2015 dodge dart, it has a vibration/hum in the gas pedal. i have taken the car to the local dodge dealer and the first time they looked at it they said it was the rotors. i have since replaced the front rotors and brakes. and after replacing the rotors and brakes its still doing it. so i took it back to the dodge dealer and they said it was the motor mounts so they replaced the rear motor mount they claimed the rear motor mount was loose and popping. I also had a new set of tires put on the car and today its still doing it. i called the dodge dealer again and have to go back next week again to have them look at it. At this point im about fed up with this car.