Disconnected battery. Reconnect the battery terminal. Need echeck soon. Hold accelerator to floor for at least 5 seconds, release pedal and turn off ignition switch. To reset a car's computer, disconnect the battery, clip the battery cables together, clean all of the battery terminals and connectors, reconnect the battery cables, and start the vehicle. computers may require a computer relearn procedure after the vehicle battery is disconnected. 1. Remove key. Not a daily driver vehicle. www.carnewscafe.com/2014/09/resetting-cars-computer-without-tools You can also check your owner’s manual for any procedures or drive cycles you can perform to "teach" the car functions it may have lost while the battery was disconnected. Pliers or battery wrench ; Writer Bio. Each window has to be reset. Many newer cars with powertrain control modules (PCMs) have to relearn engine idle after a battery is disconnected. This 45-minute procedure requires safety gloves, electrical tape, a bucket, baking soda, water, a sponge, a towel and the vehicle key. One of the more common ways that people go about resetting their vehicle’s check engine light is by disconnecting the battery, but this can be a huge mistake. Your car should now be reset. Get in car, close door, insert key and turn to the "run" position, but do not start engine. 2. How to Reset a Car Computer ... Keep the car disconnected like this for two to three minutes to clear the computer's memory. Disconnecting the battery can cause all sorts of problems that you don’t want to deal with, so you should avoid it if at all possible. 1. The removal of electrical power from the engine erases idle memory from the PCM, the computer where it is stored. Things You'll Need. How many miles of driving does it take for a chrysler to reset a reflashed/refurbished pcm. All your radio presets will be … There are 2 things that need to be reset after disconnecting or replacing the battery. From outside the car, close all doors, insert key in driver's door, turn to right to roll down all the windows. Depending on the vehicle and how it is equipped, Should work normal after that 2. Insert the fuse back in to the box. When the vehicle battery is disconnected, this memory is lost, resulting in a driveability problem. The relearning process depends on the PCM. Disconnecting the battery isnt an actual reset for the computer, its more like telling the computer to temporarily turn the check engine light off, it will always come back on with the same errors, at least if its a mechamical issue. To accomplish this, start the vehicle and roll each window down and hold for 1 second. All cars are different. If both of those are performed and you're still experiencing issues, your car may require a special computer to re-initialize the modules that lost memory. 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