Ever found yourself frantically pressing your Subaru key fob, only for nothing to happen? That sinking feeling when your car won’t unlock, especially when you’re loaded down with gear after an epic trail ride or a grocery run, is something no one wants. A dead key fob battery can turn a minor inconvenience into a major headache, leaving you stranded or scrambling for a spare.
Don’t get caught off-guard again. This guide from FatBoysOffroad will walk you through exactly how to change subaru key fob battery yourself, saving you a trip to the dealership and precious time. We’ll cover identifying your fob type, gathering the right tools, a step-by-step replacement process, and even some pro tips to keep your remote running smoothly, ensuring you’re always ready for your next adventure.
Knowing this simple DIY fix is a crucial skill for any Subaru owner, whether you’re tackling the urban jungle or exploring remote backroads. Let’s dive in and get your key fob back in action!
Recognizing the Signs: Is Your Key Fob Battery Dying?
Before you even think about cracking open your key fob, it’s good to be sure the battery is the culprit. Sometimes, other issues might be at play, but a dying battery usually gives you a few tell-tale signs.
Intermittent or Reduced Range
One of the first indications is that your key fob starts working inconsistently. You might have to press the button multiple times, or get much closer to your Subaru than usual for it to respond. If you used to lock your doors from across the parking lot but now have to be right next to the driver’s side, your battery is likely on its way out.
Delayed Response
When you press the unlock or lock button, there might be a noticeable delay before your car reacts. This sluggishness is often a sign that the battery isn’t providing enough power for an instant signal.
No Response at All
Eventually, a completely dead battery will result in no response whatsoever. This is the most frustrating scenario, especially when you’re in a hurry or in a remote location. Always keep your physical key handy as a backup for manual entry.
Dashboard Warning Lights
Some newer Subaru models might even display a low battery warning on your dashboard or infotainment screen. Pay attention to these alerts; they’re designed to give you a heads-up before you’re truly stuck.
Gather Your Gear: Essential Tools and Battery Types
Before you begin the process of changing your key fob battery, ensure you have the right equipment. This isn’t a job you want to start without the proper tools, especially if you’re out on the trail and need a quick fix.
What You’ll Need
- New Replacement Battery: This is the most critical item. We’ll discuss types below.
- Small Flathead Screwdriver: A jeweler’s screwdriver or a very thin flathead works best. It’s used for prying open the fob and sometimes for gently removing the old battery.
- Plastic Pry Tool (Optional but Recommended): A plastic trim removal tool or even a guitar pick can prevent scratches or damage to your key fob casing.
- Clean Work Surface: A well-lit, clean area helps prevent losing tiny screws or components.
- Owner’s Manual (Optional): Your Subaru owner’s manual might have specific instructions for your exact key fob model.
Identifying the Correct Battery Type
Subaru uses a few common battery types for their key fobs, primarily coin-cell lithium batteries. The exact type depends on your vehicle’s year and key fob design. The most common ones are:
- CR2032: This is by far the most prevalent battery found in many Subaru key fobs, especially for models like the Outback, Forester, Crosstrek, and Impreza from recent years. It’s a 3-volt battery.
- CR1632: Some older or smaller key fob designs might use a CR1632, which is also a 3-volt battery but slightly smaller in diameter.
- CR2025: Less common, but occasionally used in some specific models or older fobs.
The best way to confirm your battery type is to open your existing key fob and look at the number printed on the old battery. It will clearly state “CR2032,” “CR1632,” or “CR2025.” Always use the exact replacement type.
Step-by-Step Guide: how to change subaru key fob battery
Now that you’ve got your tools and the correct battery, let’s get down to business. This process is generally straightforward, but pay close attention to the specifics of your key fob design.
Step 1: Retrieve the Emergency Key
Most modern Subaru key fobs have a hidden emergency key blade. This is your first step. Look for a small button or latch on the side or back of the fob. Press or slide it, and the metal key blade will pop out. Pull it completely free.
- Why this matters: Removing the emergency key often reveals the seam where the two halves of the fob meet, making it easier to open.
Step 2: Carefully Pry Open the Fob Casing
With the emergency key removed, you’ll see a seam running around the edge of the key fob. This is where you’ll insert your prying tool.
- Locate the Notch: Many Subaru fobs have a small notch or indentation along the seam, often near where the emergency key was housed. This is the ideal starting point.
- Insert Your Tool: Gently insert your small flathead screwdriver or plastic pry tool into this notch.
- Twist and Pry: With a slow, controlled motion, twist the screwdriver or gently pry the two halves apart. You might hear a small click as the clips holding it together release.
- Work Your Way Around: Once one section starts to separate, carefully work your way around the seam, prying the two halves apart until the casing fully separates. Be gentle to avoid damaging the plastic tabs.
Pro Tip: If you’re struggling, try starting from a corner or the top edge. Avoid excessive force, as you could crack the plastic casing.
Step 3: Remove the Old Battery
Once the fob is open, you’ll see the circuit board and the coin-cell battery, usually held in place by small metal clips or a slot.
- Note Orientation: Before removing the old battery, take a mental picture or note which side is facing up (usually the positive (+) side). This is crucial for proper reinstallation.
- Gently Pry Out: Use your small flathead screwdriver to carefully pry the old battery out of its holder. Be gentle with the metal clips; they can bend easily.
Safety Note: Avoid touching the circuit board with your bare fingers if possible, as static electricity can potentially damage electronic components. Hold the battery by its edges.
Step 4: Insert the New Battery
Now it’s time for the fresh power source.
- Match Orientation: Insert the new battery (e.g., CR2032) into the holder, ensuring it’s oriented the exact same way the old one was. The positive (+) side typically faces upwards.
- Snap into Place: Gently press the new battery down until it snaps securely into its clips. Ensure it sits flush in its compartment.
Step 5: Reassemble and Test Your Key Fob
With the new battery in place, it’s time to put everything back together.
- Align the Halves: Carefully align the two halves of the key fob casing. Make sure all the buttons are properly seated and the internal components haven’t shifted.
- Press to Close: Press the two halves firmly together until you hear them click and seal completely. Run your finger along the seam to ensure it’s closed tightly.
- Reinsert Emergency Key: Slide the emergency key blade back into its slot until it clicks securely into place.
- Test Functionality: Immediately test your key fob. Stand near your Subaru and press the lock and unlock buttons. You should notice an instant, strong response. If it works, congratulations! You’ve successfully completed the process to how to change subaru key fob battery.
What if it doesn’t work? Don’t panic. Sometimes, the fob might need a quick re-synchronization. Stand close to your car and try pressing the lock or unlock button several times. If it still doesn’t work, re-open the fob and double-check the battery orientation and ensure it’s seated properly. Make sure the battery is indeed new and the correct type.
Troubleshooting Common Key Fob Issues
Even after a battery change, you might encounter some minor hiccups. Here’s how to troubleshoot them.
Fob Not Responding After Battery Change
This is the most common issue. First, re-check the battery. Is it the correct type? Is it inserted with the correct polarity (positive side up)? Is it seated firmly?
Sometimes, the fob simply needs to be re-synchronized with the vehicle. For many Subarus, simply pressing a button on the fob while sitting inside the car, or cycling the ignition on and off, can re-establish the connection. Check your owner’s manual for specific reprogramming steps, though often, simply replacing the battery doesn’t require full reprogramming for newer models.
Damaged Internal Components
If the fob was dropped or exposed to moisture, the internal circuit board might be damaged. Look for any visible corrosion, loose components, or bent pins. If you suspect internal damage, a professional might be needed.
Vehicle-Side Issues
Rarely, the issue might not be the fob but your car’s receiver. If you have a second key fob and it also isn’t working, or if the problem persists even after a new battery and troubleshooting, it could indicate a problem with the car’s remote entry system. This would require a diagnostic at a dealership or trusted automotive shop.
Pro Tips for Key Fob Longevity and Reliability
Keeping your key fob in top shape is essential, especially when you’re relying on it in the middle of nowhere. Here are some seasoned tips from the FatBoysOffroad crew.
Carry a Spare Battery
If you’re an off-road enthusiast or frequently travel to remote areas, always keep a spare CR2032 (or whatever your fob uses) in your glove box or emergency kit. Imagine being miles down a logging road, needing to lock up your rig, and your fob dies. A spare battery is cheap insurance.
Protect Your Fob
Key fobs are surprisingly robust, but they aren’t indestructible. Avoid dropping them, especially on hard surfaces. Consider a silicone protective case to absorb impacts and keep out dust and moisture, which are common enemies in off-road environments.
Avoid Extreme Temperatures
Leaving your key fob in direct sunlight on a hot dashboard or in freezing temperatures for extended periods can shorten battery life. Just like your phone, extreme temps aren’t good for tiny electronics.
Know Your Manual Key
Always know how to access and use your physical emergency key. Practice opening your driver’s door manually. This is your lifeline if your fob completely fails, or if your car’s main battery dies and the central locking system is unresponsive.
Regularly Check Battery Status
If your Subaru has a low battery warning feature, pay attention to it. Otherwise, if you notice the range decreasing or a slight delay in response, it’s a good time to preemptively replace the battery rather than waiting for it to die completely.
When to Seek Professional Help
While learning how to change subaru key fob battery is a great DIY skill, there are times when it’s best to call in the experts.
Persistent Malfunctions
If your key fob still isn’t working correctly after a fresh battery and thorough troubleshooting, there might be an issue with the fob’s internal electronics or the vehicle’s receiver. This requires specialized diagnostic equipment.
Damaged Fob Casing
If you accidentally damage the key fob casing during the battery replacement, or if it was already broken, the internal components might not be protected. A professional can assess whether it needs a new casing or a complete fob replacement.
Lost or Stolen Fob
For lost or stolen fobs, you’ll need a new one programmed to your vehicle, and potentially the old one deactivated for security. This is definitely a job for the dealership or an automotive locksmith specializing in key programming.
Programming Issues
While many simple battery replacements don’t require reprogramming, some older or more complex systems might. If your owner’s manual suggests specific programming steps that you’re uncomfortable with, or if standard troubleshooting doesn’t work, a professional can handle the programming for you.
Frequently Asked Questions About Subaru Key Fob Batteries
How long do Subaru key fob batteries usually last?
Typically, a Subaru key fob battery will last anywhere from 2 to 4 years. This can vary based on usage frequency, environmental conditions, and the specific key fob model. If you use your fob constantly, it might be on the shorter end of that spectrum.
Can I use any brand of CR2032 battery?
Yes, any reputable brand of CR2032 (or CR1632, etc.) coin-cell battery will work. Brands like Energizer, Duracell, Panasonic, or Sony are all reliable choices. Just ensure it’s a fresh, new battery.
Will changing the battery erase my key fob’s programming?
For most modern Subaru key fobs, simply changing the battery will not erase its programming. The fob retains its code even without power for a short period. In rare cases, especially with older models, a quick re-synchronization might be needed by pressing a button while near the car.
What if I can’t open my key fob?
If you’re having trouble prying open your key fob, double-check your owner’s manual for specific instructions for your model. Ensure you’ve removed the emergency key blade first, as this often reveals the access point. Use gentle, even pressure, and try a plastic pry tool to avoid marring the plastic.
My car has keyless access and push-button start. Does this change anything?
For keyless access and push-button start systems, a dying key fob battery might first manifest as needing to hold the fob closer to the start button to get the car to recognize it. The battery replacement process for these fobs is generally the same as described, often using a CR2032 battery.
Conclusion: Empowering Your Off-Road Adventures
There you have it – a comprehensive guide on how to change subaru key fob battery. This simple DIY task is a rite of passage for any car owner and especially useful for off-roaders and adventurers. Knowing how to handle this common issue yourself not only saves you money but also ensures you’re never caught off-guard, whether you’re at the local grocery store or miles deep on a remote trail.
By following these steps, you’ve gained a valuable skill that contributes to your overall vehicle maintenance knowledge and self-reliance. Keep those spare batteries handy, protect your fob, and you’ll always have reliable access to your trusty Subaru. Stay safe, stay prepared, and keep those wheels turning!
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