Modern Subaru vehicles rely on smart key fobs to lock doors, unlock the trunk, and even start the engine remotely. These compact remotes run on small coin-cell batteries, and when the battery becomes weak, you may notice reduced signal range or the key fob stopping altogether. Fortunately, Subaru key fob battery replacement is quick, inexpensive, and easy to do at home.
Subaru Key Fob Battery Replacement: Most Subaru key fobs use CR2032 or CR2025 lithium coin batteries, which are widely available online or in stores. In this guide, you’ll learn how to recognize when your battery needs replacing, what tools you need, and how to safely swap the battery in minutes.
Signs Your Subaru Key Fob Battery Is Dying
Before replacing the battery, it helps to recognize the common warning signs.
Reduced Remote Range
One of the earliest indicators is shorter operating distance. You might need to stand much closer to your vehicle for the remote to work.
Buttons Respond Slowly
Another symptom is delayed response when pressing lock, unlock, or trunk buttons.
Dashboard Key Warning
Many newer Subaru models—like the Outback, Forester, Crosstrek, and Impreza—may display a “Key Battery Low” warning on the dashboard.
If you notice any of these issues, replacing the battery usually resolves the problem immediately.
What Battery Does a Subaru Key Fob Use?
Most Subaru key fobs use lithium coin-cell batteries, which are small round batteries commonly used in electronics.
Common Battery Types
The most common options include:
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CR2032 – used in many Subaru smart key fobs
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CR2025 – used in some older remote models
These batteries are inexpensive and widely available at:
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Automotive stores
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Electronics retailers
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Online marketplaces like Amazon
Always check your vehicle manual or the battery inside your fob to confirm the correct type.
Battery Lifespan
A Subaru key fob battery typically lasts 2 to 4 years, depending on usage.
Frequent use of remote start, locking, and unlocking may shorten battery life.
Tools Needed for Battery Replacement
One advantage of replacing a Subaru key fob battery is that very few tools are required.
Basic Tools
Most drivers only need:
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A small flathead screwdriver or coin
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A new CR2032 or CR2025 battery
Some key fobs include a small slot or notch designed specifically for opening the remote case.
Safety Tips
When replacing the battery:
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Avoid touching the battery terminals excessively
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Keep batteries away from children and pets
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Handle the key fob gently to avoid damaging internal electronics
With these simple precautions, the process is very safe and straightforward.
Step-by-Step Subaru Key Fob Battery Replacement
Replacing the battery generally takes less than five minutes.
Step 1: Remove the Emergency Key
Most Subaru smart key fobs contain a hidden emergency key.
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Slide the release button on the back of the fob.
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Pull out the metal key.
This key also helps open the remote casing.
Step 2: Open the Key Fob Case
Insert the flathead screwdriver or the metal key into the small notch on the fob.
Gently twist the tool to separate the two halves of the plastic casing.
Take care not to apply excessive force.
Step 3: Remove the Old Battery
Inside the fob, you’ll see the round coin battery.
Carefully lift the battery out using your fingernail or screwdriver.
Pay attention to the battery orientation (+ and – sides) before removing it.
Step 4: Insert the New Battery
Place the new CR2032 or CR2025 battery into the slot with the positive side facing up, unless your model specifies otherwise.
Make sure the battery sits firmly in place.
Step 5: Reassemble the Key Fob
Snap the two halves of the key fob back together.
Then reinsert the emergency key into its slot.
Your key fob should now work normally.
Testing and Programming the Key Fob
After replacing the battery, it’s important to verify everything works correctly.
Test the Basic Functions
Stand near your vehicle and press:
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Lock
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Unlock
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Trunk or liftgate
The car should respond immediately.
Do You Need to Reprogram the Key Fob?
In most cases, reprogramming is not required after a battery change.
However, if the key fob fails to work:
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Move closer to the vehicle
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Try unlocking manually with the emergency key
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Start the vehicle to re-sync the system
Only rarely does a battery change require full reprogramming.
Tips to Extend Your Key Fob Battery Life
Simple habits can help your Subaru key fob battery last longer.
Avoid Constant Button Pressing
Repeatedly pressing buttons—especially from long distances—can drain the battery faster.
Keep the Key Fob Dry
Moisture can damage internal electronics and shorten battery life.
Store Spare Batteries
Keeping an extra CR2032 battery in your home or car can save time if the remote suddenly stops working.
Conclusion
A Subaru key fob battery replacement is one of the easiest vehicle maintenance tasks you can perform. With just a small screwdriver and a new coin-cell battery, most Subaru drivers can replace the battery in under five minutes.
By recognizing early warning signs—like reduced range or dashboard alerts—and replacing the battery promptly, you can ensure your keyless entry and remote features continue working reliably.
Regular battery replacement every 2–4 years keeps your Subaru’s smart key system functioning smoothly and prevents inconvenient lockout situations.
