What Does It Mean When It Says Key Battery Low

by Phil Borges // in Car

There are a lot of things that can go wrong with your car, and one of the most common problems is a low battery. If you see the warning light for “key battery low” comes on, it means that you need to replace the battery as soon as possible. In this blog post, we will talk about what causes the key fob battery low warning light to show and how to fix it. We will also provide some tips on how to extend the life of your car’s key battery.

What does it mean when it says key battery low?

When your key fob says its battery is low, it means that you need to replace the battery in order for the key fob to function properly. The key fob battery should be replaced every two years or so to ensure optimal performance.

There are a few benefits of having a new battery in your key fob. The most obvious one is that you’ll be able to unlock your car and start it without any trouble. Another benefit is that your key fob will have a longer lifespan if you replace the battery regularly. And finally, a new battery can help improve the signal strength between your key fob and car. So if you’re looking for a way to improve the functionality and lifespan of your key fob, installing a new battery is definitely the way to go.

Not replacing the battery can ultimately lead to having to replace the entire key fob. Depending on the make and model of your key fob, you may need to take it to a dealership or specialist in order to get a new one. If key fob battery is low and you do not replace it when needed, you may also experience difficulties locking or unlocking your car doors. To avoid these inconveniences, it is best that you are able to spot the early signs of low battery in key fob, such as:

  • The most common symptom of a low battery in a key fob is difficulty locking or unlocking the car.
  • Other symptoms of a low battery include a flashing light on the key fob and a beeping sound when you press the unlock button.
  • A weak signal can also be a sign that it is low key battery.

If you experience either of these symptoms, it’s likely that your battery needs to be replaced as soon as possible. Be sure to keep a spare battery on hand as well so that you can replace the battery when it starts to wear down. You can purchase key fob batteries at most electronics stores or online.

Do I need to reprogram my car key if I replace the battery?

Reprogramming the car key after replacing the battery will depend on the make and model of your car. For most cars, you will need to remove the key from the fob and reprogram it by following the car’s owner’s manual. Some newer models have a “keyless go” or proximity key that does not require any programming if the battery is replaced.

In some rare cases, the car key will only need to be reprogrammed if the chip inside the key has been damaged or if the car’s computer system has been changed in some way, which would require a new programming sequence. This task might be complex enough that you would need to take the car to a dealership or locksmith.

It is always best to consult your car’s owner’s manual for specific instructions on how to reprogram your car key in the event of a battery replacement.

If you are not comfortable doing this yourself, it is always best to take the car to a professional. They will be able to help you with any questions or concerns that you may have and can ensure that the job is done correctly.

What happens if my key fob battery dies while driving?

If the key fob battery dies while driving, the car will still start, and you can continue to drive it. However, you won’t be able to lock or unlock the car using the key fob until you replace the battery. You can also use the manual locking/unlocking method (described in your owner’s manual). If you need a new key fob, contact your dealership.

If this happens, it is always best to err on the side of caution and replace the battery in your key fob as soon as possible. A dead key fob battery can’t do anything to help you if you get locked out of your car. Plus, it’s just a good idea to keep a fresh battery in your key fob so that you’re always prepared in case of an emergency.

Why does my key fob says low battery with new batteries?

  • Make sure that the new battery is installed correctly. Check for the battery’s polarity (+ and -) if these are inserted properly.
  • It’s possible that the key fob needs to be “reset” after a battery replacement. This is a common procedure for many electronic devices.
  • It’s also possible that there is something wrong with the electronic circuitry in your key fob. If replacing the battery doesn’t fix the issue, you might need to take your key fob to a Ford dealership for repair.
  • Your key fob is damaged and needs to be replaced.

If you’re still having trouble with your key fob after trying these troubleshooting tips, don’t hesitate to contact a Ford dealership for assistance. They can help you determine what’s wrong with your key fob and provide the necessary repairs.

How long do you have when your key fob says low battery?

When your key fob says low battery, you generally have around one or two weeks before the battery completely dies. Of course, this varies depending on how often you use your key fob and how much power it has to expend each time you do use it.

If you regularly use your key fob to unlock and start your car, then you might find that the battery drains more quickly. In this case, it’s a good idea to have a backup key fob or Mechanical Key available, in case your primary key fob does die.

Generally speaking, though, as long as you keep an eye on the low battery indicator and make sure to replace the batteries in a timely manner, you shouldn’t have any problems.


Replacing the battery regularly in your Ford key fob is the answer to many common issues. The good news is that battery replacement is a relatively easy process, but if it doesn’t seem to be working correctly after you’ve installed the new battery, there are some things you can try to fix the issue. If the tips mentioned in this article don’t work, don’t hesitate to contact a Ford dealership for assistance. They can help you determine what’s wrong with your key fob and provide the necessary repairs.

A Mechanical Key is a traditional key that is inserted into the door lock or ignition switch to unlock or start the vehicle. It can be used as a backup option in case the key fob’s battery dies.

Source: West Herr

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.