Ever found yourself stranded, key fob unresponsive, miles from civilization? It’s a gut-punching moment, especially when you’re geared up for an off-road adventure or just trying to start your day. A dead key fob battery can turn a simple errand into a frustrating ordeal.
But don’t fret! This common issue is surprisingly easy to fix, and you don’t need a dealership or specialized tools. Knowing how to replace Subaru fob battery yourself can save you time, money, and a lot of headaches, whether you’re in your driveway or out on the dusty trails.
This comprehensive guide from FatBoysOffroad will walk you through every step. We’ll cover everything from identifying your fob type to safely swapping out the battery and even some troubleshooting tips. Get ready to empower yourself with this essential DIY skill!
Why Your Subaru Key Fob Battery Dies (And What It Means for Your Adventures)
Your Subaru key fob is a small but mighty piece of tech, constantly communicating with your vehicle. This constant activity, even when seemingly idle, slowly drains its internal battery. Understanding the lifespan and symptoms can save you from unexpected trouble.
Common Symptoms of a Dying Fob Battery
Recognizing the warning signs early is key. Your Subaru might start acting a bit quirky before the battery completely gives up the ghost.
You might notice you have to press the buttons multiple times to lock or unlock the doors. The range of your fob could significantly decrease, forcing you to stand closer to your car.
Sometimes, the dashboard might display a “low key fob battery” warning message. Don’t ignore these signals; they’re your car telling you it’s time for a change.
How Long Do Fob Batteries Last?
Typically, a Subaru key fob battery will last anywhere from two to four years. This can vary greatly depending on your usage habits.
If you’re constantly pressing buttons, or if your fob is frequently within range of your vehicle, it might drain faster. Extreme temperatures, like those encountered during harsh winters or scorching summers, can also affect battery life.
It’s a good habit to proactively change your fob battery every two to three years. This prevents those frustrating moments when you’re stuck far from home.
Avoiding Emergency Situations on the Trail
Imagine being deep in the backcountry, enjoying a remote campsite, and your Subaru won’t unlock. This isn’t just an inconvenience; it can be a safety issue.
A dead fob can leave you unable to start your vehicle or even get inside. Always carry a spare battery, especially on extended trips. Knowing the manual entry and start procedures for your specific Subaru model is also crucial.
In a true emergency, like being stranded in a remote area, having a fully functional vehicle is paramount. A dead fob battery is a solvable problem that can quickly escalate if you’re unprepared.
Essential Tools and Supplies for a Subaru Fob Battery Change
Before you dive into the replacement process, gather your tools. Most items are common household objects, making this a truly accessible DIY task. Knowing what you need upfront makes the job smooth and quick.
Identifying Your Subaru Key Fob Type
Subaru uses a few different types of key fobs, and the battery replacement method can vary slightly. The most common are the traditional key fob with a physical key and the modern push-button start fob (often called a Smart Key).
Examine your fob carefully. Does it have a flip-out key, or is the key stored inside the fob itself? The push-button start fobs are usually flatter and lack a visible key blade until you slide a release tab.
Knowing your fob type helps you determine the exact battery needed and the correct way to open it without causing damage. Most modern Subarus use a Smart Key system.
Recommended Battery Types (CR2032, CR1632, etc.)
The most common battery for Subaru key fobs is the CR2032 coin cell battery. However, some older models or specific fob designs might use a CR1632 or CR2025.
It’s always best to confirm the battery type before you start. You can usually find this information in your owner’s manual. Alternatively, once you open the fob, the battery itself will have the type printed on it.
These batteries are widely available at grocery stores, electronics shops, and even gas stations. Always opt for a reputable brand to ensure longevity and performance.
Basic Tools You’ll Need
You won’t need a mechanic’s toolbox for this job. A few simple items are all it takes.
Here’s a quick list:
- Small flathead screwdriver or coin: For prying open the fob casing.
- New coin cell battery: The correct type (e.g., CR2032).
- Soft cloth or lint-free towel: To protect your fob from scratches.
- Optional: Plastic prying tool: If you’re worried about scratching the fob with metal.
That’s it! With these items in hand, you’re ready to tackle the task. Always work on a clean, well-lit surface to avoid losing small components.
Step-by-Step Guide: How to Replace Subaru Fob Battery Safely
Now for the main event! This detailed guide covers the most common Subaru key fob types. Follow these instructions carefully to ensure a smooth and successful battery replacement. This section will specifically detail how to replace Subaru fob battery for both standard and push-button start models.
Opening Your Standard Key Fob
For older models with a traditional key fob, the process is straightforward.
- Locate the Seam: Most standard fobs have a visible seam running around the edge. This is where the two halves of the casing meet.
- Insert Prying Tool: Carefully insert a small flathead screwdriver or a coin into the seam.
- Gently Twist and Pry: With a gentle twisting motion, apply pressure to separate the two halves. You might hear a small click as they come apart. Work your way around the seam if needed.
- Remove the Old Battery: Once open, you’ll see the circuit board and the coin cell battery. Note its orientation (which side is facing up). Gently pry out the old battery.
Replacing the Battery in a Push-Button Start Fob
Modern Subarus with keyless entry and push-button start have a slightly different design, but the principle is similar.
- Remove the Emergency Key: First, you need to access the hidden emergency key. Look for a small release tab or button on the side of the fob. Slide or press it, then pull out the metal key blade.
- Locate the Notch: With the emergency key removed, you’ll expose a small notch or slot inside the key’s cavity.
- Pry Open the Casing: Insert your flathead screwdriver or a plastic prying tool into this notch. Gently twist the screwdriver to pry the two halves of the fob apart. The casing should split open relatively easily.
- Remove the Old Battery: Once open, you’ll see the circuit board and the coin cell battery. Pay close attention to the battery’s polarity – the positive (+) side usually faces up. Gently pop out the old battery.
- Insert New Battery: Place the new CR2032 (or correct type) battery into the slot, ensuring the positive (+) side is facing the correct direction, usually up.
Dealing with Emergency Key Access
Even with a dead fob, your Subaru has a backup plan. The physical emergency key hidden inside your push-button start fob is not just for opening the casing.
You can use this key to manually unlock your driver’s side door. Look for a small keyhole cover on the door handle, which you might need to pry off. Once inside, you can often start the car by holding the dead fob directly against the push-start button. Consult your owner’s manual for the exact procedure for your model.
This is a crucial skill for off-roaders who might find themselves without cell service or roadside assistance. Practice it once to ensure you know how it works.
Reassembly and Testing
Once the new battery is in, it’s time to put everything back together and test your work.
- Align the Halves: Carefully align the two halves of the key fob casing.
- Snap Together: Gently press the halves together until they snap securely into place. You should hear a distinct click.
- Reinsert Emergency Key: For push-button fobs, slide the emergency key back into its slot until it locks.
- Test the Fob: Go to your Subaru and test all the functions. Lock, unlock, trunk release, and remote start (if equipped). Ensure everything works perfectly.
If you followed these steps for how to replace Subaru fob battery, your fob should be as good as new!
Troubleshooting Common Issues After Battery Replacement
Sometimes, despite your best efforts, the fob still doesn’t quite work right. Don’t panic! Most post-replacement issues are minor and easily fixable. Here’s what to check.
Fob Still Not Working?
If your key fob remains unresponsive after replacing the battery, check a few key things.
First, double-check the battery orientation. Is the positive (+) side facing the correct way? An upside-down battery is a common oversight. Next, ensure you have the correct battery type; a CR2025 won’t work if your fob needs a CR2032.
Also, inspect the battery contacts inside the fob. Make sure they are clean and making good contact with the battery. Sometimes, a tiny bit of corrosion or a bent contact can prevent power flow.
Reprogramming Your Key Fob (When Necessary)
In most cases, replacing the battery in a Subaru key fob does not require reprogramming. The fob retains its pairing information even with a power interruption.
However, if your fob still isn’t working after confirming the battery and contacts are good, reprogramming might be necessary. This is rare for a simple battery swap but can happen. Reprogramming procedures vary by model year.
Often, you can find instructions in your owner’s manual or online forums for your specific Subaru model. If all else fails, a dealership can reprogram it for you, but this usually comes with a fee.
Preventing Future Battery Drain
To maximize your new battery’s life, consider these habits.
Avoid leaving your key fob in places where it’s constantly interacting with your car, such as right next to it in your garage. Keep it away from other electronics, which can sometimes interfere with its signal and cause unnecessary drain.
Storing your fob in a cool, dry place when not in use can also help prolong battery life. Extreme heat or cold can degrade the battery faster.
Pro Tips for Subaru Owners and Off-Roaders
As seasoned adventurers, we know that preparedness is everything. A dead key fob can be more than an inconvenience when you’re far from paved roads. Here are some “FatBoysOffroad” insights to keep you rolling.
Always Carry a Spare Battery
This is perhaps the most crucial tip for any off-roader or long-distance traveler. A spare CR2032 battery is small, lightweight, and inexpensive.
Stash one in your glove box, your camping kit, or even your wallet. When your fob inevitably dies in the middle of nowhere, you’ll be incredibly grateful for that little disc. It’s a simple piece of insurance against being stranded.
Imagine trying to flag down a park ranger just to get a battery for your car – not ideal. Be self-reliant!
Protecting Your Fob from the Elements
Your Subaru key fob isn’t always as rugged as your vehicle. Exposure to water, dust, and extreme temperatures can damage it and shorten battery life.
Consider a protective silicone cover for your fob, especially if you’re frequently outdoors or prone to dropping things. These covers can shield it from impacts, moisture, and grime. If your fob gets wet, open it up (following the battery replacement steps) and let it air dry completely before reassembly, just like you would with a wet cell phone.
Even if you’re careful, accidental exposure happens. A little proactive protection goes a long way in preserving your fob’s functionality.
When to Seek Professional Help
While learning how to replace Subaru fob battery is a great DIY skill, there are times when professional assistance is the best course of action.
If you’ve replaced the battery correctly, checked the contacts, and even attempted reprogramming, but your fob still isn’t working, it might indicate a more serious issue. The fob itself could be damaged, or there might be an issue with your car’s receiver.
In such cases, it’s wise to visit your Subaru dealership or a trusted automotive locksmith. They have diagnostic tools and expertise to pinpoint the exact problem and offer a reliable solution, whether it’s repairing the existing fob or programming a new one.
Frequently Asked Questions About Subaru Key Fob Batteries
Here are some common questions we hear from our community about maintaining their Subaru key fobs.
How do I know what battery my Subaru fob takes?
The most reliable way is to check your Subaru’s owner’s manual. It will specify the exact coin cell battery type, usually a CR2032 or CR1632. Alternatively, you can open your fob (following the steps above) and the battery itself will have the type printed on it.
Can I damage my fob changing the battery?
It’s possible, but unlikely if you follow the steps carefully and use appropriate tools. The most common mistake is using too much force when prying it open, which can scratch the casing or damage internal components. Using a plastic prying tool instead of a metal screwdriver can reduce this risk.
Do I need to reprogram my Subaru key after changing the battery?
No, in most cases, you do not need to reprogram your Subaru key fob after a simple battery change. The fob’s pairing information is stored in non-volatile memory and is not lost when the battery is removed. Reprogramming is typically only needed if you get a brand new fob or if the existing fob becomes unpaired due to a fault.
What if my emergency key doesn’t work?
If your emergency key (the physical metal key inside your fob) isn’t unlocking the door, first ensure you’re using it in the correct keyhole (usually on the driver’s door handle, sometimes hidden under a cap). If it still doesn’t work, the lock cylinder itself might be frozen or damaged. In extreme cold, try gently warming the key or lock with your hand. If the key is bent or damaged, you might need a locksmith to cut a new one.
Replacing your Subaru key fob battery is a straightforward task that every Subaru owner, especially those who venture off-road, should know. It’s a fundamental skill that promotes self-reliance and ensures you’re never caught off guard.
By following this guide, you’ve not only learned a practical skill but also gained confidence in tackling minor automotive issues yourself. Keep a spare battery handy, protect your fob, and remember these steps. This little bit of preparedness can make a huge difference in your next adventure.
Stay safe and stay comfortable on all your journeys – knowing your gear is ready for anything!
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