Subaru Key Fob Battery Low: Troubleshooting and Solutions

Subaru key fob battery low – When your Subaru key fob battery is low, it can be a frustrating experience. This guide will provide you with the information you need to troubleshoot and resolve common key fob battery issues, ensuring your vehicle remains accessible and secure.

Delving into the intricacies of key fob battery basics, we’ll explore the different types of batteries used, their functions, and the simple steps involved in replacing them.

Key Fob Battery Basics

Subaru key fob battery low

A key fob battery is a small, replaceable battery that powers the electronic functions of a key fob. Key fobs are small, handheld devices that allow you to lock and unlock your car, as well as perform other functions, such as opening the trunk or sounding the alarm.

The battery in a key fob is responsible for providing power to the fob’s electronic components, such as the buttons, LED lights, and transmitter.

There are several different types of batteries used in key fobs, including coin batteries, button batteries, and lithium batteries. Coin batteries are the most common type of battery used in key fobs. They are small, round batteries that are typically made of lithium or silver oxide.

Button batteries are also common in key fobs. They are small, flat batteries that are typically made of lithium or alkaline. Lithium batteries are the most expensive type of battery used in key fobs, but they also last the longest.

Replacing a Key Fob Battery

Replacing a key fob battery is a simple process that can be done in a few minutes. To replace the battery in your key fob, you will need a new battery and a small screwdriver. First, remove the key from the fob.

Then, use the screwdriver to open the back of the fob. Once the back of the fob is open, you will see the battery. Remove the old battery and insert the new battery into the fob. Make sure that the positive (+) and negative (-) terminals of the battery are aligned correctly.

Finally, close the back of the fob and replace the key.

Troubleshooting Battery Issues: Subaru Key Fob Battery Low

Subaru key fob battery low

A key fob is a small, wireless device that allows you to lock and unlock your car, as well as open the trunk and sound the alarm. Key fobs are powered by batteries, and when the battery is low, it can cause the key fob to malfunction.

There are a few signs and symptoms that can indicate a low key fob battery. One common sign is that the key fob’s range will be reduced. This means that you will have to be closer to your car in order to lock or unlock it.

Another sign of a low key fob battery is that the buttons on the key fob will become less responsive. You may have to press the buttons multiple times in order to get them to work.

If you are experiencing any of these signs or symptoms, it is likely that your key fob battery is low. You can diagnose a low key fob battery by following these steps:

  • Check the key fob’s battery indicator.Many key fobs have a small battery indicator light that will illuminate when the battery is low.
  • Try replacing the battery.If you have a spare key fob battery, try replacing the battery in your key fob. If this resolves the issue, then you know that the battery was low.
  • Take your key fob to a locksmith.If you are unable to diagnose or resolve the issue yourself, you can take your key fob to a locksmith. A locksmith will be able to test the battery and replace it if necessary.

There are a few common key fob battery problems that you may encounter. One common problem is that the battery may become corroded. This can happen if the key fob is exposed to moisture or if the battery is old.

If the battery is corroded, it will need to be replaced.

Another common key fob battery problem is that the battery may become loose. This can happen if the key fob is dropped or if the battery is not properly installed. If the battery is loose, it may not make good contact with the terminals in the key fob, which can cause the key fob to malfunction.

If you are experiencing any key fob battery problems, it is important to resolve the issue as soon as possible. A dead key fob battery can prevent you from locking or unlocking your car, which can be a major inconvenience.

Key Fob Battery Maintenance

Maintaining the battery in your key fob is essential for ensuring the continued proper functioning of your vehicle’s keyless entry and other features. Regular maintenance can help extend the life of the battery and prevent unexpected issues.

Neglecting key fob battery maintenance can lead to several potential consequences, including:

  • Difficulty unlocking or starting your vehicle
  • Intermittent or unreliable key fob operation
  • Complete failure of the key fob

To avoid these issues, it is important to follow these tips for extending the life of your key fob battery:

  • Replace the battery regularly:Most key fob batteries last for about 2-3 years. It is a good idea to replace the battery before it completely dies to prevent any inconvenience.
  • Avoid extreme temperatures:Extreme heat or cold can damage the key fob battery. Avoid leaving your key fob in direct sunlight or in very cold places for extended periods.
  • Clean the battery contacts:Over time, the battery contacts in the key fob can become dirty or corroded. This can prevent the battery from making a good connection and can lead to intermittent key fob operation. Clean the contacts with a cotton swab and rubbing alcohol to ensure a good connection.

  • Store the key fob properly:When not in use, store the key fob in a cool, dry place. Avoid storing it in a pocket or purse where it can be subjected to moisture or physical damage.

Advanced Key Fob Features

Modern key fobs come equipped with advanced features that enhance convenience and functionality, but these features can also impact battery life. Understanding these features and their impact can help you use them wisely to preserve battery power.

Key fob features that consume more battery power include remote start, keyless entry, and panic buttons. Remote start allows you to start your vehicle from a distance, keyless entry unlocks the doors without requiring a key, and panic buttons trigger an alarm in case of an emergency.

While these features are useful, using them frequently can drain the battery.

Optimizing Battery Usage

To use these features without excessively draining the battery, consider the following tips:

  • Limit remote starts to necessary situations, such as warming up your vehicle in cold weather.
  • Avoid using keyless entry repeatedly within a short period, as it constantly sends signals to the vehicle.
  • Use the panic button only in emergencies, as it triggers a high-power alarm.

Security Considerations

A low key fob battery can have serious security implications. When the battery is low, the key fob may not be able to send a strong enough signal to the car, making it easier for thieves to break in. Additionally, a low battery can make it more difficult to use the key fob’s panic button, which can be a safety concern in an emergency.

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To protect against unauthorized access due to a low battery, it is important to keep the key fob battery fresh. You should also be aware of the signs of a low battery, such as a weak signal or difficulty using the panic button.

If you notice any of these signs, you should replace the battery as soon as possible.

Stay Safe with a Low Key Fob Battery

  • Be aware of the signs of a low battery.
  • Replace the battery as soon as possible if you notice any signs of a low battery.
  • Keep a spare key fob battery on hand.
  • Park in well-lit areas.
  • Be aware of your surroundings and be cautious of anyone approaching your car.

Key Fob Battery Replacement Options

When the battery in your key fob dies, you’ll need to replace it to restore the functionality of your key fob. There are a few different options for replacing a key fob battery, each with its own pros and cons.

Dealer Replacement, Subaru key fob battery low

Replacing the battery at a dealership is the most expensive option, but it’s also the most convenient. The dealership will have the right battery for your key fob and will be able to replace it quickly and easily. Pros:

  • Convenient
  • Quick
  • No need to worry about finding the right battery


  • Expensive
  • May require an appointment

Locksmith Replacement

A locksmith can also replace the battery in your key fob. This option is typically less expensive than going to a dealership, but it may take longer. The locksmith will need to order the correct battery for your key fob, which can take a few days.


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  • Less expensive than a dealership
  • May be able to come to your location


  • May take longer
  • May not have the correct battery in stock

Do-It-Yourself Replacement

If you’re handy, you can replace the battery in your key fob yourself. This is the least expensive option, but it’s also the most time-consuming. You’ll need to find the correct battery for your key fob and then follow the instructions in your key fob’s manual.


  • Least expensive
  • Can be done at your convenience


  • Time-consuming
  • May be difficult if you’re not handy

Choosing the Best Option

The best option for replacing the battery in your key fob depends on your individual needs and preferences. If you need your key fob replaced quickly and easily, then going to a dealership is the best option. If you’re on a budget, then replacing the battery yourself is the best option.

And if you’re somewhere in between, then going to a locksmith is a good compromise.

Case Studies and Examples

Analyzing real-world instances of key fob battery issues can provide valuable insights into the nature of these problems and potential solutions. Here are a few case studies:

Case 1: Battery Depletion due to Excessive Use

In one instance, a car owner noticed that their key fob battery was draining rapidly. Upon investigation, it was discovered that the key fob was being used excessively for non-essential tasks, such as repeatedly locking and unlocking the car multiple times.

This excessive use drained the battery prematurely.

Case 2: Key Fob Signal Interference

Another case involved a key fob that intermittently failed to unlock the car. Troubleshooting revealed that the issue was caused by signal interference from a nearby electronic device. The interference disrupted the communication between the key fob and the car’s receiver, preventing the car from recognizing the key fob.

Lessons Learned

These case studies highlight the importance of using key fobs responsibly to avoid premature battery depletion. Additionally, it emphasizes the potential impact of environmental factors, such as electronic interference, on key fob functionality.

Insights for Prevention

  • Use key fobs only when necessary to conserve battery life.
  • Be aware of potential sources of signal interference and keep key fobs away from such devices.
  • Consider using a key fob signal booster to enhance signal strength in areas with interference.

Conclusive Thoughts

By understanding the signs of a low key fob battery, you can promptly address the issue and prevent potential security risks. Additionally, implementing regular maintenance practices will extend the lifespan of your key fob battery, ensuring it remains a reliable companion for your Subaru.

Question & Answer Hub

What are the signs of a low key fob battery?

Dim or intermittent key fob lights, reduced range, and difficulty unlocking or starting the vehicle are common signs.

How do I replace the battery in my Subaru key fob?

Refer to your vehicle’s owner’s manual for specific instructions. Generally, you’ll need a small screwdriver or coin to open the key fob and replace the battery.

How can I extend the life of my key fob battery?

Avoid excessive use of key fob features, such as remote start or trunk release, and store the key fob in a cool, dry place.

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