Will disconnecting car battery harm computer?

by Phil Borges // in Car

Many would say that the answer is no, but there are many different opinions. The short answer to the question is that disconnecting your car battery will not harm your computer. Here's why:

The main concern with this process is whether or not the power in the car battery will drain and die before you can get it back on again. Car batteries have a very low internal resistance, so they don't discharge quickly when disconnected from their load (i.e., engine). It takes days for them to completely lose all of their energy if they were fully charged in the first place.

Will disconnecting the battery reset the computer?

If you disconnect the battery, will it reset the computer? It's possible that the answer is yes. If you're not sure whether or not disconnecting the battery will harm your computer. It might be best to err on the side of caution and avoid doing so. Some computers are more sensitive than others when it comes to voltage changes, so it's important to be aware of potential risks before taking any action. If you're still not sure what to do, consult with a professional or your computer manufacturer to get more specific instructions.

Let's take a look at how a computer works. When you turn on your car, the engine starts and sends power to the computer. The computer then runs all of the systems in your vehicle, from the brakes to the steering wheel.

If your car has an automatic transmission, disconnecting the battery will reset it. But in most newer cars with computer-controlled engines and transmissions, including all modern gas, diesel, hybrid-powered ones as well you'll find that unplugging power sources does nothing but potentially clear out old presets for clocks or radio stations (depending on how complicated their programming is).

ECU ( Electronic Control Unit) is short for the engine control unit. This is the part of the computer that controls the engine. It reads information from sensors all over the car and makes decisions based on what it finds. When you turn off your car, ECU turns off the engine.

How do I disconnect my car battery without losing memory?

Steps on disconnecting a car battery without losing memory:

First, find your battery. Unplug it and find where the outlet is located. Once you have found an open power source for yourself, make sure not only does there appear to be enough electricity flowing out of each wire but also none coming back into their respective plugs.

Second, set up a secondary power source. Find a stable location in the engine bay where you can site it so that leads will easily reach terminals on board of current vehicle's electric box (usually found near the driver's side). Now, clip crocodile clips over these connections and make sure not to let these two metal parts touch each other.

Third, remove any clamps that are holding your battery in place. You can do this by looking for bolts or screws at the base of your current one and loosening them with a socket set until it falls free from its mounting bracket, then pull up on these tabs once they've been pulled out enough so as not to damage anything else around where you're working (be careful if there's other metal nearby).

Fourth, remove your old battery by using a socket set for this. Place the wrench over both ends and turn it clockwise until you hear or feel wiggling from inside, then loosen slightly before removing one section at once with your fingers.

If there are no clamps holding on clips across the top, just push upward gently while pulling straight up if the clamp is around the bottom and pull up with your fingers.

Fifth, attach a new battery to the terminals on board of car's electric box so that its positive terminal is facing upwards towards you and tighten bolts or screws – remember not to let any metallic parts touch each other.

Last but definitely not least, plug in all of your accessories (like radio) back in, start up the engine and check if everything goes smoothly.

Does disconnecting battery erase codes?

Disconnecting the car battery does not erase codes. However, you should be aware that there are some cases when this can happen. In rare instances, disconnecting the car's battery has been known to erase vehicle computer memory completely. This is dangerous in two ways: one, if your reason for taking out the battery was due to an electronic malfunction of some kind, you may not be able to diagnose the cause of the issue because a large portion of your car's computer system will have been wiped off. Two, if there was an electrical reason for disconnecting the battery and it turns out that this is what caused your original problem - then by reconnecting it, you're going to run into trouble. The bottom line is that most of the time, disconnecting the battery will not harm your computer, but there are a few potential dangers to be aware of. If you're in any doubt at all, it's always best to consult with a professional.

Can a bad car battery cause computer problems?

A bad car battery can cause all sorts of electrical problems, and that includes problems with your computer. So if you're having any electrical issues with your car, be sure to have the battery checked out. Otherwise, you may end up with a computer that's not working properly.

A bad car battery can also damage your computer's power supply. So if you're thinking of disconnecting the car battery to work on the car, be very careful. You don't want to risk damaging your computer. It's always a good idea to take your computer to a professional if you're having any problems with it. They'll have the tools to diagnose any problems you're having, and they'll be able to fix it.


There is no evidence that disconnecting a car battery will harm a computer. However, it is always best to be safe and consult with an expert if you are unsure about what to do. Disconnecting a car battery can be dangerous if done incorrectly, so it is important to take the necessary precautions before doing so.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.