What happens if I disconnect my car battery?

How long can you leave a car battery disconnected?

When stored properly out of the car in a secure place, a detached car battery has the chance to last up to six months. Just like any other car battery, it will need charging, but not as often as if it were attached. Giving the battery a charge around every 12 weeks is a good rule of thumb.

What does disconnecting the car battery do?

Disconnecting or replacing a battery on a computer-equipped vehicle may cause starting, driveability and a number of other problems, including loss of air conditioning, power accessory functions (door windows, seats, sunroof), false warning lights, even damage to certain electronic modules!

Does disconnecting the battery clear codes?

Leaving the battery disconnected for about 15 minutes will ensure the vehicle systems will completely reset when you reconnect the battery. Secure the negative cable back to the terminal and cover it with the cap (if applicable). Disconnecting the battery will clear the error codes and reset the check engine light.

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Does replacing car battery reset computer?

A normal battery swap should not result in a check engine light on the dashboard and problems. The computer should learn by itself that there is a new battery and reset itself. But sometimes it doesn’t do that and you might have to experience some unpleasant situations like this with the check engine light.

Should I disconnect battery if car parked long term?

If you don’t have access to an outlet – say, in a long-term airport parking lot – your second option is to disconnect the battery. That’ll preserve the battery’s charge, so when you reconnect it, the truck should start right up.

Can I just disconnect the negative terminal?

Q: Can you just disconnect the negative terminal? You can disconnect the battery’s negative cable. All you are required to do is to locate the negative polarity of the battery and disconnect the terminal. Avoid the negative terminal to make contact with the positive one.

What happens if you disconnect the positive terminal first?

It’s important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first.

When disconnecting a car battery which terminal do you disconnect first?

“Positive first, then negative. When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.”

Will disconnecting battery cause check engine light?

Check Engine Light

If the light comes on and doesn’t go off, something in the system is indicating a problem. Sometimes this happens after disconnecting the battery; the computer needs to complete system checks and “relearn” the vehicle’s operations. This may take several miles and a few trips to complete.

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How long should I disconnect my car battery to reset computer?

How to Disconnect a Car Battery to Reset the Computer

  1. Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner. …
  2. Hold the positive and negative cable ends together so they’re touching each other but not the battery.
  3. Wait five minutes for the diagnostic information to be erased.

Does disconnecting a car battery save power?

When you disconnect your car battery from the car, it helps prevent the electrical systems including the clock and on-board computer system from draining it completely. Therefore, if you leave the car battery unattended for longer period, then it might damage the battery and even need replacement.

Why do I have to disconnect and reconnect my battery to start my car?

These electronic gremlins are becoming commonplace as computer cars age… Sounds like what is left of your anti-theft/alarm system is malfunctioning and preventing the car from starting… By disconnecting the battery, you are resetting the computer and the alarm and the “no start” condition is removed…