Ever found yourself frantically pressing your Subaru key fob, only to be met with deafening silence? Your doors won’t unlock, the alarm won’t disarm, and suddenly, you’re locked out of your own adventure. It’s a frustrating situation, especially when you’re far from home or just trying to get on with your day.
That dead key fob battery isn’t just an inconvenience; it’s a roadblock. But don’t worry, you don’t need a trip to the dealership or an expensive service call for this common issue. With a few simple tools and a few minutes of your time, you can quickly bring your remote back to life.
In this comprehensive guide from FatBoysOffroad, we’ll walk you through everything you need to know about how to replace battery in subaru key fob, covering various models and types. We’ll make sure you have the confidence to tackle this DIY task, saving you time, money, and a whole lot of hassle.
Signs Your Subaru Key Fob Battery is Dying
Before you even think about opening up your key fob, it’s helpful to recognize the tell-tale signs of a dying battery. Catching these early can prevent you from being stranded when you least expect it.
Don’t wait until your remote is completely unresponsive. Pay attention to these common indicators:
- Reduced Range: You have to be much closer to your Subaru for the remote to work.
- Intermittent Functionality: Sometimes it works, sometimes it doesn’t, or you have to press the buttons multiple times.
- Delayed Response: There’s a noticeable lag between pressing a button and your car reacting.
- Dash Warning Light: Some newer Subaru models will display a low key fob battery warning on the instrument cluster.
- No Response At All: The ultimate sign – nothing happens when you press any button.
Addressing these symptoms promptly will ensure your key fob remains reliable for all your off-road excursions and daily commutes.
Essential Tools and Parts for Your Key Fob Battery Swap
Gathering your supplies before you start makes the process smooth and hassle-free. Most of what you need is likely already in your toolbox.
Here’s a quick list of the necessities:
- New Coin Cell Battery: This is the most crucial part. Subaru key fobs typically use CR2032, CR1632, or sometimes CR2025 batteries. Always check your owner’s manual or the existing battery’s label to confirm the correct type.
- Small Flathead Screwdriver or Plastic Pry Tool: Essential for carefully opening the key fob casing without causing damage. A plastic pry tool is often preferred to avoid scratching the plastic.
- Soft Cloth (Optional but Recommended): To protect your key fob from scratches while you work on it.
Identifying Your Subaru Key Fob Battery Type
Knowing the correct battery is paramount. While CR2032 is very common, some slimmer or older fobs might use different sizes.
Here are some general guidelines, but always verify:
- Most Modern Subaru Fobs (2015+ with push-button start): Often use a CR2032 lithium coin cell battery.
- Older Subaru Fobs (pre-2015, or non-push-button start): May use a CR1632 or occasionally a CR2025.
- Key Fobs with Integrated Physical Key: These are usually the ones that require specific battery types.
The safest bet is to open your key fob first, note the battery type, and then purchase the replacement. Or, consult your Subaru owner’s manual, which will list the exact battery specifications for your vehicle’s remote.
Step-by-Step: how to replace battery in subaru key fob
Now for the main event! This detailed walkthrough will guide you through the process, ensuring you handle your key fob with care.
Remember to work on a clean, well-lit surface to avoid losing any small parts.
1. Separating the Physical Key (If Applicable)
Many modern Subaru key fobs have a hidden physical key inside. This key needs to be removed first to access the battery compartment.
- Locate the small release button or switch on the side or back of your key fob.
- Press or slide it, then pull out the metal emergency key. Set it aside in a safe place.
This step is crucial for gaining access to the main casing.
2. Opening the Key Fob Casing
This is often the trickiest part, as you don’t want to damage the plastic housing.
- Look for a small notch or seam along the edge of the key fob where the two halves meet. This is your entry point.
- Insert your small flathead screwdriver or plastic pry tool into this notch.
- Gently twist the tool or pry the halves apart. You should hear a soft click as the clips release.
- Work your way around the seam, slowly separating the casing. Be patient and avoid excessive force.
Some fobs might have a small screw holding them together, usually hidden under the Subaru logo. If you encounter resistance, double-check for a screw before prying harder.
3. Removing the Old Battery
Once the key fob is open, you’ll see the circuit board and the coin cell battery.
- Note the orientation of the old battery (which side is facing up – usually the positive ‘+’ side). This is important for correct installation of the new battery.
- Using your small flathead screwdriver or the tip of your finger, gently pry out the old battery. It’s usually held in place by small metal clips.
- Avoid touching the circuit board with your bare hands if possible, as static electricity can potentially damage electronic components.
Dispose of the old battery responsibly. Most electronics stores or recycling centers accept them.
4. Inserting the New Battery
This step is straightforward, but correct orientation is key.
- Take your new coin cell battery (e.g., CR2032).
- Insert it into the battery slot, ensuring the positive ‘+’ side faces the same direction as the old battery. This is usually upwards, towards the back of the fob casing.
- Gently press the battery into place until it’s secure under the metal clips.
Double-check the battery type one last time to ensure it matches the original and fits snugly.
5. Reassembling the Key Fob
Putting it back together is usually easier than taking it apart.
- Align the two halves of the key fob casing.
- Press them firmly together until you hear and feel the clips snap back into place. Ensure there are no gaps around the seam.
- If you removed a physical key, slide it back into its slot until it clicks securely.
Give the key fob a gentle squeeze to ensure everything is tightly sealed.
Testing Your Refreshed Subaru Key Fob
The moment of truth! After all your hard work, it’s time to test your key fob’s functionality.
Take your newly re-energized key fob to your Subaru and:
- Unlock/Lock Doors: Test all buttons – lock, unlock, trunk release, and panic button.
- Start the Engine: For push-button start models, ensure the car recognizes the fob and allows you to start the engine.
It should respond instantly and reliably. If it doesn’t, don’t panic; we’ll cover troubleshooting next.
Troubleshooting Common Key Fob Battery Replacement Issues
Sometimes, things don’t go perfectly on the first try. Here are a few common problems and their solutions when you replace battery in subaru key fob.
Key Fob Still Not Working After Battery Change
If your remote is still unresponsive, check these points:
- Battery Orientation: Double-check that the new battery is inserted with the correct positive (+) and negative (-) sides facing the right way.
- Correct Battery Type: Confirm you used the exact battery type (e.g., CR2032, CR1632) specified for your specific Subaru key fob model.
- Battery Charge: Believe it or not, sometimes new batteries can be dead or low on charge. Try another fresh battery if available.
- Bent Contacts: The small metal tabs that hold the battery in place can sometimes get bent during removal or insertion. Gently bend them slightly inward to ensure good contact with the battery.
- Fob Damage: Inspect the circuit board for any visible damage, cracks, or loose components. If you see damage, the fob might need professional repair or replacement.
Key Fob Requires Reprogramming
In rare cases, after a battery change, some older Subaru key fobs might lose their programming. Newer models typically retain their programming during a battery swap.
If your fob needs reprogramming:
- Check Your Owner’s Manual: Some manuals provide DIY programming instructions. These often involve specific sequences of door opening/closing, key insertion, and button presses.
- Consult a Dealership or Locksmith: If DIY programming doesn’t work or isn’t detailed in your manual, a Subaru dealership or an automotive locksmith can reprogram your key fob for a fee.
This is usually not necessary for a simple battery change, but it’s good to be aware of the possibility.
Maintaining Your Key Fob for Longevity
A little care can go a long way in extending the life of your key fob and its battery.
- Avoid Drops: Repeatedly dropping your key fob can damage the internal components or dislodge the battery.
- Keep it Dry: Moisture is the enemy of electronics. Avoid exposing your key fob to water, rain, or high humidity.
- Extreme Temperatures: Don’t leave your key fob in direct sunlight on your dashboard or in extremely cold conditions for extended periods, as this can degrade battery life.
- Don’t Over-Press Buttons: Constantly mashing buttons when out of range can drain the battery faster.
- Protective Case: Consider a silicone or leather protective case to shield your fob from impacts and scratches.
By following these simple tips, you can ensure your key fob serves you reliably for years to come, whether you’re heading to the grocery store or deep into the backcountry.
When to Seek Professional Help
While learning how to replace battery in subaru key fob is a straightforward DIY task, there are times when it’s best to call in the pros.
Consider professional assistance if:
- Fob is Physically Damaged: If the casing is cracked, buttons are stuck, or you suspect internal damage beyond a battery issue.
- Reprogramming Issues: If you’ve tried all troubleshooting steps and your fob still isn’t recognized by your Subaru, or if it requires complex reprogramming you’re not comfortable with.
- Multiple Fobs Fail: If both your primary and spare key fobs suddenly stop working (and it’s not a simultaneous dead battery issue), there might be a larger problem with your car’s receiver.
- Lost All Keys: This is a major security concern and requires professional intervention to cut new keys and program new fobs to your vehicle while deactivating the lost ones.
A Subaru dealership or a reputable automotive locksmith are your go-to experts for these more complex issues.
Frequently Asked Questions About Your Subaru Key Fob Battery
How long does a Subaru key fob battery usually last?
Typically, a Subaru key fob battery lasts between 2 to 4 years. Usage frequency, environmental factors, and even the specific model of your key fob can influence its lifespan. Newer fobs with more features (like passive entry) might drain batteries slightly faster.
Can I use any CR2032 battery for my Subaru key fob?
Yes, as long as it’s the correct size (e.g., CR2032, CR1632, etc.), any reputable brand of lithium coin cell battery will work. We recommend choosing a well-known brand for better reliability and longevity.
Will replacing the battery in my Subaru key fob erase its programming?
For most modern Subaru key fobs, replacing the battery will NOT erase its programming. The internal memory usually retains the pairing information, so you shouldn’t need to reprogram it. Older models are less common to lose programming but it’s a possibility if the battery is completely dead for an extended period.
What if my key fob is sealed and I can’t open it?
Virtually all key fobs are designed to be opened for battery replacement, though some can be trickier than others. Look very closely for a small notch or seam. If you’re still struggling, consult your owner’s manual or search for specific instructions for your exact Subaru model year and key fob type online. Avoid forcing it, as this can cause permanent damage.
What should I do if my Subaru’s push-button start doesn’t work even with a new key fob battery?
First, ensure the new battery is correctly installed and fully charged. If it still doesn’t work, try holding the key fob directly against the start button when attempting to start the car. Most Subarus have a backup antenna near the start button that can read the fob’s signal even with a very weak or dead battery. If this works, it might indicate a different issue with the key fob’s main transmitter or the car’s receiver.
Conclusion: Empowering Your Subaru Adventures
There you have it! Learning how to replace battery in subaru key fob is a simple yet incredibly useful skill for any Subaru owner. No more being locked out, no more missed adventures because of a dead remote.
By following these steps, you’ve not only saved yourself time and money but also gained confidence in tackling basic automotive DIY tasks. This kind of practical knowledge is what keeps us going at FatBoysOffroad, empowering you to handle the unexpected, whether you’re navigating city streets or exploring rugged trails.
Keep your key fob powered up, and you’ll always be ready for your next journey. Stay safe, stay confident, and keep those wheels turning!
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