Do you have to disconnect both battery terminals to reset ECU? You may choose to disconnect both battery terminals to reset an ECU, but it is not required. All you need to do to reset your ECU is interrupt the power flow from the car battery to the car’s ECU. The most efficient way to disrupt the ECU’s power supply is to disconnect the negative cable from the negative terminal.
How long does it take for a car computer to reset? The readiness monitors will remain until the car has been driven long enough for the computer to evaluate the various system and sensors. The amount of time can vary based on the vehicle. In some cases it can take up to 100 miles for all of the computer monitors to completely reset.
How do you reset the electrical system in your car?
How long does the battery have to be disconnected to reset the computer? Because some of the electrical currents are preserved in the computer for a while afterward, most sources recommend leaving the battery disconnected for at least 15 minutes to make sure the computer forgets the code before you reconnect it.