How To Change Battery In Subaru Key Fob: A Step-by-Step Guide

As a Subaru owner, your key fob is an essential part of your daily driving experience. With the simple push of a button, you can lock or unlock your vehicle, pop the trunk, or even start the engine remotely. However, there’s nothing more frustrating than realizing your key fob isn’t working properly, leaving you stranded outside your car.

In most cases, a non-responsive key fob is a sign that the battery needs to be replaced. While it may seem like a daunting task, changing the battery in your Subaru key fob is actually a straightforward process that you can do yourself.

To replace the key fob battery in your Subaru, you’ll need to identify the battery type, carefully open the key fob casing, remove the old battery, insert the new one, and potentially reprogram the key fob, depending on your Subaru model.

In this step-by-step guide, we’ll cover everything you need to know about changing the battery in your Subaru key fob, including:

Common signs that your key fob battery needs to be replaced
What type of battery your Subaru key fob uses
How to open different Subaru key fob models to access the battery
Detailed instructions for replacing the battery
Tips for programming or resyncing your key fob after a battery change
Advice on when to seek professional help
Benefits of changing your key fob battery yourself

Whether you drive a brand new Subaru or an older model, this guide will provide you with the knowledge and confidence to tackle this simple maintenance task on your own. Let’s get started!

Table of Contents

Why Is My Subaru Key Fob Not Working?

Before we dive into the step-by-step process of changing your key fob battery, it’s important to understand the common reasons why your Subaru key fob might not be functioning properly. Here are a few potential culprits:

Low or dead battery: This is the most common reason for a non-responsive key fob. Key fob batteries typically last between 3-4 years, but their lifespan can be shorter or longer depending on usage and environmental factors.

Water damage: If your key fob has been exposed to moisture or submerged in water, it can cause corrosion and damage to the internal components, leading to malfunction.

Incorrect programming: For your key fob to work, it needs to be properly programmed and synced with your Subaru’s receiver. If the programming is incorrect or gets disrupted, your key fob may stop working.

Damaged internal components: Over time, the buttons, circuits, or other internal components of your key fob can become damaged due to wear and tear, rendering it inoperable.

If you’re experiencing any of these issues, it’s likely time to change the battery in your Subaru key fob or seek professional assistance if the problem persists.

What Type of Battery Does My Subaru Key Fob Use?

Before you can change the battery in your Subaru key fob, you’ll need to know what type of battery it uses. The battery type varies depending on the age and model of your Subaru, so it’s crucial to consult your owner’s manual or check with a Subaru dealership for the correct information.

Here’s a general guide to the battery types used in Subaru key fobs:

Newer rectangular key fobs (2015 and later models): These key fobs typically use a CR2032 lithium coin cell battery.

Older teardrop-shaped key fobs: These older models often use a CR2025 lithium coin cell battery.

Exposed metal key fobs (pre-2010 models): The oldest Subaru key fobs with an exposed metal key usually require a CR1620 lithium coin cell battery.

It’s important to use the correct battery type for your specific key fob model. Using the wrong battery can cause damage or improper functioning.

How to Open a Subaru Key Fob to Change Battery

Now that you know what type of battery your Subaru key fob uses, it’s time to learn how to open the key fob casing to access the battery compartment. The process varies slightly depending on the key fob model, so follow the instructions carefully.

Rectangular Bulging Key Fob

Locate the small silver tab on the back of the key fob and press it in. This will release the metal emergency key.
Use a flathead screwdriver or a coin to gently pry apart the two halves of the key fob casing. Insert the tool into the seam between the front and back of the key fob and twist gently to separate the casing.
The battery will be visible inside the key fob, either below or above the transmitter circuit board.

Teardrop-Shaped Key Fob

Locate the small notch or seam on the side of the key fob casing.
Insert a flathead screwdriver or a coin into the notch and gently twist to pry apart the two halves of the casing.
The battery will be visible inside the key fob once the casing is open.

Exposed Metal Key Fob

Locate the small notch or seam near the keyring hole on the key fob casing.
Use a flathead screwdriver or a coin to gently pry open the outer casing, revealing an inner casing.
Locate the small tabs or seams on the inner casing and press them or use your tool to pry it open as well.
The battery will be visible inside the inner casing once both casings are open.

Regardless of your key fob model, be gentle and patient when prying open the casing. Forcing or applying too much pressure can damage the key fob components.

Step-by-Step Guide to Change Subaru Key Fob Battery

Now that you’ve identified your key fob model and opened the casing, it’s time to change the battery. Follow these simple steps:

Purchase the correct replacement battery for your Subaru key fob model. You can find these batteries at most grocery stores, hardware stores, or online retailers.
Carefully note the orientation of the old battery. Is the positive (+) side facing up or down? You’ll want to insert the new battery in the same orientation.
Use a flathead screwdriver or a non-metallic tool to gently pry out the old battery. Be careful not to damage the battery compartment or any other components inside the key fob.
Insert the new battery into the compartment, ensuring the positive (+) side is oriented correctly.
Reassemble the key fob casing by snapping the two halves back together. Make sure the casing is properly aligned and securely closed.

Congratulations! You’ve successfully changed the battery in your Subaru key fob. However, there’s one more step you may need to take, depending on your key fob model.

How to Program/Resync Subaru Key Fob After Battery Change

After replacing the battery in your Subaru key fob, you may need to reprogram or resync it with your vehicle to ensure it functions properly. The process varies based on the age and model of your Subaru.

For Newer Rectangular Key Fobs

If you have a newer Subaru model with a rectangular, bulging key fob, you’ll likely need to have it programmed by an authorized Subaru dealership or service center. These key fobs use advanced technology and cannot be programmed by the owner.

For Older Teardrop/Exposed Key Fobs

If you have an older Subaru model with a teardrop-shaped or exposed metal key fob, you may be able to program it yourself using the following steps:

Sit in your Subaru with all doors and windows closed and the engine turned off.
Open the key fob casing and locate the 8-digit code printed on the circuit board. Write this code down for reference.
Follow a timed process using the lock and unlock buttons on your Subaru’s driver’s side door to input the 8-digit code.
- Open the driver’s door and press the unlock button to unlock all doors.
- Close the driver’s door and insert the key into the ignition, turning it to the “On” position (without starting the engine).
- Turn the key back to the “Off” position, then repeat this process (On, Off) 10 times in quick succession.
- You should hear a chime from the instrument panel after the 10th time you turn the key on and off in quick succession.
Open and close the driver’s side door again. You should hear another chime, and the dome light may flash.
Once you hear the second chime, you have 45 seconds to input the 8-digit code using the lock and unlock buttons on the driver’s side door:
- Press the lock button the same number of times as the first digit in the code
- Press the unlock button once
- Repeat for each subsequent digit, alternating between pressing the lock button X times and the unlock button once
After entering the full 8-digit code, you should hear a final chime from your Subaru, indicating that the key fob has been successfully programmed.
To verify, open and close the driver’s side door one more time, then press the lock or unlock button on your newly programmed key fob. Your Subaru’s doors should lock or unlock.

If you followed the steps correctly, your key fob is now programmed and synced with your Subaru. If you run into any issues or your key fob still isn’t working properly, it’s best to seek professional help.

When to Seek Professional Help

While changing the battery in your Subaru key fob is a relatively straightforward process, there are certain situations where it’s advisable to seek professional assistance:

If you’re having difficulties programming or syncing your key fob after a battery change, especially with newer Subaru models that require dealer programming.
If your key fob still isn’t working properly after replacing the battery and attempting to reprogram it, there may be a more serious issue that requires professional diagnosis.
If you need to replace your key fob entirely, either because it’s damaged beyond repair or you’ve lost it, you’ll need to purchase a new one from a Subaru dealership and have it programmed by their technicians.

Don’t hesitate to reach out to your local Subaru dealership or an authorized service center for help. While there may be a cost associated with professional key fob programming or replacement, it’s often worth it to ensure your key fob is functioning correctly and your Subaru is secure.

Key Fob Battery Life and Replacement Tips

To help you get the most out of your Subaru key fob and its battery, here are a few tips and insights regarding battery life and replacement:

Average key fob battery life: Most key fob batteries will last between 3-4 years with regular use. However, this can vary based on factors like temperature, humidity, and how frequently you use your key fob.
Keep a spare battery on hand: It’s always a good idea to have a spare key fob battery stored away, so you’re prepared when your current battery dies. This can save you a trip to the store and ensure you’re never left stranded with a non-functioning key fob.
Check the battery if range seems shortened: If you notice that you have to be much closer to your Subaru for the key fob to work, it’s likely a sign that the battery is running low and needs to be replaced soon.
Consider a protective key fob cover: To help extend the life of your key fob and its battery, you can purchase a protective cover or case. These inexpensive accessories can shield your key fob from moisture, drops, and other potential sources of damage.

Regularly checking your key fob’s battery level and replacing it promptly can save you the hassle of a non-functioning key fob and ensure you always have convenient access to your Subaru.

Benefits of Changing Key Fob Battery Yourself

While it’s certainly possible to have a Subaru dealership or automotive locksmith change your key fob battery for you, there are several benefits to taking the DIY approach:

Cost savings: Replacing a key fob battery yourself can cost just a few dollars for the battery, compared to potential service fees at a dealership or locksmith.
Convenience: You can change the battery on your own schedule, without having to make an appointment or leave your vehicle for service.
Sense of accomplishment: Tackling a simple maintenance task like this can give you a sense of pride and confidence in your ability to care for your vehicle.
Preparedness: Learning how to change your key fob battery ensures you’re prepared to handle this issue whenever it arises, without being left stranded or inconvenienced.

Of course, if you ever feel uncomfortable attempting to change the battery yourself or encounter any issues, don’t hesitate to seek professional assistance. But for most Subaru owners, this is a straightforward DIY task that can save you time and money.

In Summary

Dealing with a non-functioning key fob can be frustrating, but it’s often an easy fix – simply replace the battery! By following the steps outlined in this guide, you should be able to identify the correct battery type for your Subaru key fob, carefully open the casing, remove the old battery, insert the new one, and potentially reprogram the key fob if needed.

Changing your key fob battery is a simple maintenance task that can save you the hassle and expense of visiting a dealership or locksmith. Plus, it’s a valuable DIY skill to have in your arsenal as a Subaru owner.

Remember, if you encounter any difficulties or have concerns about damaging your key fob, don’t hesitate to seek professional assistance. Your local Subaru dealership or an authorized service center can help ensure your key fob is working properly and programmed correctly.

With a fresh battery and a little bit of effort, you can get your Subaru key fob back in top working condition and enjoy the convenience it provides for locking, unlocking, and even starting your vehicle with the push of a button.