As the filing states, Tesla has programmed code into the vehicle that can greatly reduce the chance of an unintended acceleration. The software fixes consist of complex algorithms that basically cut off electricity if the vehicle is shifted to neutral or the key is turned from the on position. As the company said of the software changes,
Note to future car buyers: next time you hit the dealerships in search of a new car, it's not a bad idea to check the build sheet and make sure the vehicle you're interested in has that anti-unintended acceleration software upgrade already installed.We stop the flow of electricity to our motor when the car is placed in neutral or the key is rotated from the 'on' position. We also stop the flow of electricity to the motor during normal vehicle operation when the brake pedal is depressed for more than two seconds.