Can a Low Car Battery Affect Key Fob?

by Phil Borges // in Car

When you’re trying to start your car in the dead of winter, nothing happens when you turn the key in the ignition. Worse, it stops working as you put the car in drive. You might blame the cold weather for causing that problem. But in this case, something goes wrong with your car’s battery. In this blog post, we’ll explore how a low car battery can affect key fob functionality and offer some tips on how to fix the problem.

A car key fob is a small device that uses radio frequencies to communicate with the vehicle. It can be programmed in many ways, but one of its most basic functions is opening and closing locks on an automobile.

Does car battery affect key fob?

It’s possible that a car battery could affect a key fob , but it would depend on the type of battery and the make and model of the key fob. Remote central locking is now the standard on most vehicles. When the car‘s battery dies, it can cause many problems. In this case, we’re dealing with lock issues because no signals are being sent back down the wire without power from anywhere (including Body Control Module). Thus, nothing happens when you try to open or lock your door. If this happens, you will then have to access the door manually.

Can a dead car battery cause the key fob not to work?

Many people think that if their car battery is dead, then the key fob will not work either. However, this is not always the case. A low car battery can sometimes cause the key fob to function properly. Conversely, in other cases, a weak or dying car battery may prevent the key fob from working. It depends on your car’s model and key fob’s specific design.

Some key fobs are more susceptible to low battery power than others. If the car battery is dead, the car’s electrical system will also be dead, which means that the key fob won’t be able to send a signal to the car to unlock it.

A dead car battery can not only cause problems with your key fob, but it can also affect the car’s electronics. That means you will have to deal with more than just a dead key fob if that is what happens to go wrong first. This problem should not be taken lightly, as a dead car battery can leave you stranded.

Can a dead battery affect key fob?

The most common reason a key fob doesn’t work is that the batteries are dead. A dead battery in a key fob can affect its ability to function. When the battery dies, the key fob will no longer be able to send or receive a signal to unlock your car. A dead battery may also prevent the key fob from working altogether.

But there are a few other things that could cause it to malfunction, such as corrosion on the battery contacts, a weak or discharged battery, or if the fob has been dropped or damaged. It is vital that owners should be aware of the bad key fob battery symptoms.

Keeping your key fob in good working order keeps the batteries changed with new ones when necessary and avoids dropping or damaging them. If you experience problems with your key fob, take it to a qualified technician for check and repair if needed.

What are the symptoms of low battery in key fob?

A few symptoms indicate that your key fob battery is running low. One is that the transmitter’s range will start to diminish, so the signal won’t reach as far as it used to. This can mean you must be closer to your car to unlock or start the engine.

Another symptom is that the buttons on the key fob will become unresponsive or erratic. If you press the button and nothing happens, or if the remote function starts working erratically, it could signify a dying battery.

If you notice either of these signs of low battery in key fob, it’s time to replace the battery in your key fob.

Can a low battery in key fob cause car not to start?

If your key fob has a low battery, it could cause your car not to start. This is because the key fob sends a signal to the car that tells it to start; if that signal is weak, the car may not respond. Therefore, if you’re having trouble starting your car and you know that your key fob has a low battery, it’s worth changing the battery to see if that fixes the problem.

What can a low car battery affect?

If you’re wondering what can happen if your car’s battery is too low, there are a few things to keep in mind. For starters, a low car battery can affect your car’s performance, making it difficult to start the engine. Beyond that, there are a number of other problems that can crop up if your battery is low, including:

  • Stalling while driving
  • The vehicle does not turn back off after being turned off
  • Reduced power and acceleration
  • Inability to change gears correctly
  • Dimmed headlights or dashboard lights
  • A clicking noise when trying to start the car
  • Inability to turn the car on at all


If your battery is low enough, you may lose the ability to unlock or lock your car using the key fob. This can be very inconvenient if you are stranded with a dead battery, especially during cold weather when it’s more difficult for the battery to charge back up. If the battery is too low, you should make an appointment with a local auto shop as soon as possible before your key fob becomes completely useless.

Keeping your car battery in top shape can help prolong its life and can ensure that all of your car’s features continue to work properly. Thus, scheduling a regular car battery checkup helps to ensure your car runs smoothly. Also, check the battery in your key fob if it needs to be replaced; a fresh new battery will help ensure that your key fob works perfectly fine.

For more information on car batteries, check out our article on the best lithium battery for car audio. And if you’re wondering how long a car has to run to charge a battery, be sure to read our article on that topic as well. Finally, if you need to replace the battery in your key fob, we’ve got you covered with our guides on how to change the battery in a Toyota RAV4 smart key fob and how to replace the battery in a 2014-2015 Ford Fusion key fob.

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.