Can a low car battery affect key fob?

by Phil Borges // in Car

It's the dead of winter, and you're on your way to work when you go to start your car and... nothing. You try again with the same result. The third time's the charm, but as soon as you put the car in drive, it dies. You know that it's not the cold weather causing these problems – it must be your car battery. So what do you do? One possible solution is to call a tow truck and have your car towed to the nearest service station. But there might be an easier fix: checking if your key fob is transmitting a weak signal. 

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.

Does car battery affect key fob?

A car key fob is a small device that uses radio frequencies to communicate with the vehicle. It can be programmed in many different ways, but one of its most basic functions is opening and closing locks on an automobile. Car batteries are important for a number of reasons, from powering the vehicle to running electronic devices. When there is a low battery in a car, it can cause problems with other devices in the car as well, including the key fob's functionality.

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 standard on most vehicles. When the car's battery dies, it can cause all sorts of problems. In this case, we're dealing with lock issues because without power from anywhere in particular (including Body Control Module), there are no signals being sent back down the wire, and thus nothing happens when you try opening or locking 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. In some instances, a low car battery can still 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 all depends on the make and model of your car, as well as the specific design of your key fob.

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 definitely 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. In some cases, 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.

The key to keeping your key fob in good working order is to keep the batteries changed with new ones when necessary and to avoid dropping or damaging it. If you do experience any 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?

There are a few symptoms that can indicate that your key fob battery is running low. One is that the range of the transmitter will start to diminish, so the signal won't reach as far as it used to. This can mean that you have to be closer to your car to unlock it 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 be a sign of a dying battery.

If you notice either of these symptoms, 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 potentially cause your car not to start. This is because the key fob sends a signal to the car that tells it to start, and if that signal is weak then 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 your car's battery is too low, it will affect your car's performance, and it won't be able to properly start the engine. This can cause a number of other problems that can be inconvenient, 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 you're having trouble starting your car, there's a good chance that the problem is a low car battery. A low battery can affect many different areas of your car's performance, so it's important to get it checked as soon as possible. By keeping your battery in good condition, you can avoid these problems and keep your car running smoothly.


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 and you lose the ability to unlock or lock your car using it.

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. If you're having trouble with your key fob, have your battery checked to make sure it's not the issue. A low car battery can cause all sorts of problems, so it's always a good idea to keep an eye on it.

Schedule a regular car battery checkup to make sure your car is running smoothly. Check as well the battery in your key fob - if it needs to be replaced. A fresh new battery will help ensure that your key fob is always working properly.

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.