How To Disconnect A Car Battery To Reset The Computer. With a can of spray-on battery cleaner remove any corrosion from the battery and terminals. An old mechanics trick for turning for temporarily eliminating certain kinds of driveability problems is to disconnect the battery ground cable for 10 seconds to reset the computer.
A popular method of resetting the check engine light although not necessarily recommended is to disconnect the car battery to remove the power source to the cars central computer. Clean the battery posts and terminals with the post and terminal cleaning tool so you have a good connection when. How to Reset a Car Computer.
While the cars main battery is disconnected.
Open up the hood. You can also reset your car computer without having to disconnect your car battery. Disconnect the battery and Switch the ignition key to the on position for about 15 minutes should reset the ECU. Wait at least ten.
