Ever found yourself staring at your Subaru, key fob in hand, pressing the unlock button repeatedly with no response? It’s a frustrating moment, especially if you’re out on a trail, miles from anywhere, or just trying to get to work on a Monday morning. A dead key fob battery can leave you feeling stranded and powerless, but the good news is that learning how to replace Subaru key fob battery is a surprisingly simple DIY task.
At FatBoysOffroad, we believe in empowering you, the everyday driver, the weekend warrior, and the off-road enthusiast, with the knowledge to tackle common vehicle issues yourself. This comprehensive guide will walk you through everything you need to know, from identifying a dying battery to the step-by-step replacement process for various Subaru key fob types. We’ll even throw in some pro tips to ensure you’re never caught off guard again, keeping your adventures rolling smoothly.
Signs Your Subaru Key Fob Battery is Dying
Before you even think about cracking open that key fob, it’s good to know the tell-tale signs that its battery is on its last legs. Catching these warnings early can save you a lot of hassle.
Don’t wait until your keyless entry remote completely gives up the ghost. Proactive replacement is always the best approach.
Intermittent Operation
One of the first signs is inconsistent performance. Your fob might work perfectly sometimes, and then refuse to unlock your doors others.
You might find yourself pressing the button multiple times, or needing to be very close to the vehicle for it to respond.
Reduced Range
Normally, you can unlock your Subaru from a good distance away. As the battery weakens, that range shrinks significantly.
If you have to be right next to the driver’s side door for the fob to work, it’s definitely time for a change.
No Response at All
This is the most obvious sign. You press the button, and nothing happens. No lock, no unlock, no panic alarm.
While frustrating, this usually means the battery is completely drained and needs immediate attention.
Dashboard Warnings
Some newer Subaru models, especially those with push-button start, might display a “Key Fob Battery Low” message on your dashboard or multi-information display.
Pay attention to these digital alerts; they’re designed to give you a heads-up before total failure.
Gathering Your Tools and Supplies
Before you begin the process to replace your Subaru key fob battery, ensure you have the right tools and a fresh battery. Having everything laid out beforehand makes the job quick and seamless.
Most of these items are common household tools, making this a truly accessible DIY repair.
The Right Battery Type
This is crucial! Most modern Subaru key fobs use a specific type of lithium coin cell battery. The most common is the CR2032.
However, some newer models, especially those with the sleek, oval-shaped push-button start fobs, might use a CR1632 or even a CR2025.
Always check your owner’s manual or, better yet, open your existing fob first to confirm the exact battery number stamped on it.
Essential Tools
- Small Flat-Head Screwdriver: Often used to pry open the key fob casing. Choose one with a thin blade to avoid damaging the plastic.
- Plastic Pry Tool (Optional but Recommended): These non-marring tools are fantastic for separating plastic components without scratching or denting them. A guitar pick or a credit card edge can work in a pinch.
- New Battery: As identified above (e.g., CR2032, CR1632).
- Clean Cloth: To wipe down the fob if needed.
Avoid using metal tools if possible when prying, as they can easily scratch the fob’s finish or even damage the internal circuit board if you slip.
Step-by-Step Guide: How to Replace Subaru Key Fob Battery
The exact procedure for replacing your Subaru key fob battery can vary slightly depending on your specific key fob design. We’ll cover the two most common types: the traditional flip-key/integrated remote and the newer push-button start fob.
Take your time with each step and remember to work on a clean, well-lit surface.
Type 1: Traditional Flip-Key or Integrated Remote Fob (Older Models)
Many Subaru models, particularly those from the early 2000s to mid-2010s, feature a key fob integrated into a flip-key or a separate remote with a traditional key.
This type often has a small seam around the edge where the two halves of the casing meet.
- Locate the Seam and Notch: Examine your key fob. You’ll usually find a small notch or indentation along the edge where the two halves of the plastic casing meet.
- Separate the Casing: Insert your small flat-head screwdriver or plastic pry tool into this notch. Gently twist or pry to separate the two halves of the key fob. Work slowly and carefully around the entire seam to avoid cracking the plastic.
- Access the Circuit Board: Once the case is open, you’ll see the circuit board and the battery. The battery is usually held in place by small clips.
- Remove the Old Battery: Using your screwdriver or pry tool, carefully lift the old battery out from its clips. Note its orientation (which side is facing up – usually the positive ‘+’ side).
- Insert the New Battery: Place the new CR2032 (or appropriate battery) into the battery slot, ensuring the positive ‘+’ side is facing the same direction as the old one. This is crucial for proper function.
- Reassemble the Fob: Carefully align the two halves of the key fob casing and press them together until they click securely into place. You should hear a satisfying snap.
- Test the Fob: Head to your Subaru and test all the buttons – lock, unlock, and panic. It should respond immediately.
If you’re in a remote area and need to open the fob, a coin or even a sturdy fingernail can sometimes be used if you don’t have a screwdriver handy.
Type 2: Push-Button Start Key Fob (Newer Models)
Newer Subaru vehicles (roughly 2015-present, depending on the model) often come with a sleek, oval-shaped key fob that allows for keyless entry and push-button start.
These fobs typically have an emergency mechanical key hidden inside.
- Remove the Emergency Key: Look for a small button or lever on the side or back of the key fob. Press or slide this, and pull out the mechanical emergency key. This reveals a small slot or seam.
- Locate the Battery Compartment Slot: With the emergency key removed, you’ll see a slot or a small indentation where the key was housed. This is your entry point.
- Gently Pry Open the Fob: Insert your small flat-head screwdriver or plastic pry tool into this slot. Twist gently to pry open the key fob casing. The two halves should separate with a little pressure.
- Access and Remove the Old Battery: Inside, you’ll find the battery (often a CR1632 or CR2032) sitting in a holder. Carefully pry it out from its clips, again noting the positive ‘+’ side orientation.
- Insert the New Battery: Slide the fresh battery into the holder, making sure the positive ‘+’ side faces the correct direction. Avoid touching the circuit board with your fingers, as oils can interfere with conductivity.
- Reassemble the Fob: Align the two halves of the key fob and press them firmly together until they snap shut. Reinsert the emergency mechanical key until it clicks into place.
- Test the Fob: Go to your Subaru and test all functions: lock, unlock, trunk release, and ensure the push-button start works without a “Key Fob Battery Low” warning.
Always keep the emergency key handy, even after replacing the battery. It’s your failsafe for manual entry if the fob ever completely fails or is lost.
Troubleshooting and Common Issues
Even after a successful battery swap, sometimes things don’t go exactly as planned. Don’t panic! Here are some common issues and how to address them.
Most problems are minor and easily fixed with a bit of patience and attention to detail.
Fob Still Not Working After Battery Replacement
If your key fob remains unresponsive, retrace your steps:
- Check Battery Orientation: Did you insert the new battery with the correct positive/negative orientation? This is the most common mistake.
- Ensure Secure Connection: Is the battery seated firmly in its clips? Sometimes it needs a gentle push to make full contact.
- Verify Battery Type: Are you absolutely sure you used the correct battery (e.g., CR2032 vs. CR1632)? Even a slight difference can prevent it from working.
- Try a Different New Battery: Occasionally, a new battery might be a dud. If you have another, try swapping it in.
If you’re out camping or far from a store, ensure you always carry a spare battery. It’s a small item that can save a big headache.
Fob Needs Resyncing (Rare for Battery Change)
For most modern Subarus, replacing the battery does not require resyncing or reprogramming the key fob to the vehicle.
The immobilizer chip and remote access memory are usually non-volatile and retain their programming through a battery swap.
However, if you have an older model or experience persistent issues, a professional diagnostic tool might be needed to re-pair the fob with your car’s system. This is typically a job for a Subaru dealership or an automotive locksmith.
Damaged Internal Components
When prying open the fob, it’s possible to accidentally damage the small internal components or the circuit board itself.
If you suspect damage, or if the fob was dropped or exposed to moisture, it might be beyond a simple battery replacement. In such cases, you might need a new key fob and professional programming.
Always handle the internal electronics with care, avoiding static electricity discharge if possible.
Extending Your Key Fob Battery Life
Once you’ve mastered how to replace Subaru key fob battery, you’ll want to make that new battery last as long as possible. A few simple habits can significantly extend its lifespan.
Being mindful of how you treat your key fob can prevent premature battery drainage.
Keep it Away from Electronics
Your key fob constantly communicates with your car, even subtly. Keeping it too close to other electronics like cell phones, laptops, or even certain smart home devices can cause it to “wake up” more frequently, draining the battery faster.
Store your key fob in a dedicated spot, away from other gadgets, when not in use.
Avoid Extreme Temperatures
Extreme heat or cold can degrade battery performance and shorten its overall life. Don’t leave your key fob baking on the dashboard in direct sunlight or freezing in your car overnight in winter.
Treat your key fob like any other sensitive electronic device.
Limit Unnecessary Button Presses
Every time you press a button on your key fob, it sends a signal, which consumes a small amount of power.
While this is minimal, constantly pressing buttons out of habit or boredom can cumulatively reduce battery life over time.
Use Your Mechanical Key When Possible
For vehicles with push-button start, you can still use the hidden mechanical key to unlock the driver’s door if the fob battery dies. This won’t save battery life, but it’s a good habit to practice using it occasionally so you know how in an emergency.
Knowing how to use the emergency key is a critical piece of preparedness for any off-road adventure or remote travel.
Pro Tips for Off-Roaders and DIY Enthusiasts
As fellow FatBoysOffroad members, we know you appreciate practical advice that goes beyond the basics. Here are some extra pointers to keep you prepared, especially when you’re far from civilization.
These insights come from years of hands-on experience and real-world scenarios.
Always Carry a Spare Battery (or Two!)
This is non-negotiable for anyone venturing off the beaten path. A dead key fob battery deep in the wilderness is more than an inconvenience – it can be a serious safety issue.
Keep a couple of the correct battery types (CR2032 or CR1632) in your glove box, emergency kit, or tool bag. They’re small, lightweight, and incredibly cheap insurance.
Make sure to store them in their original packaging to prevent accidental discharge or short circuits.
Practice the Manual Entry
For push-button start Subarus, know how to access and use your emergency mechanical key. Practice inserting it into the door lock cylinder (often hidden under a cap on the door handle) and manually unlocking your door.
This skill is vital if your fob completely dies and you need to get into your vehicle. Some newer Subarus even allow you to start the car by holding a dead fob against the start button.
Familiarize Yourself with Your Specific Fob
While we’ve covered the most common types, Subaru has had many fob designs over the years. Before you need to replace the battery in an emergency, take a moment to examine your specific fob.
Identify the seams, the emergency key release, and how it’s likely to open. This pre-familiarization saves critical time and reduces stress during an actual battery failure.
Consider a Fob Protector
If you’re constantly dropping your keys or they take a beating during your adventures, a silicone or leather key fob protector can offer an extra layer of defense against physical damage and moisture.
These small accessories can extend the life of your entire key fob, not just the battery.
Frequently Asked Questions About Replacing Subaru Key Fob Battery
How long does a Subaru key fob battery typically last?
Generally, a Subaru key fob battery lasts between 2 to 4 years. Its lifespan can be influenced by factors like usage frequency, proximity to other electronics, and exposure to extreme temperatures.
Do I need to reprogram my Subaru key fob after changing the battery?
In most cases, no. Modern Subaru key fobs retain their programming even when the battery is removed. You should be able to simply replace the battery and continue using it as normal.
What happens if I put the key fob battery in backward?
If you insert the battery backward, the key fob simply won’t work. It’s unlikely to cause permanent damage, but always ensure the positive (+) side of the battery matches the corresponding marking inside the fob for correct operation.
Can a dead key fob battery prevent my Subaru from starting?
For vehicles with a traditional ignition key, a dead key fob battery will only prevent remote locking/unlocking. You can still use the physical key to start the car. For push-button start models, a dead fob battery will prevent the push-button start from working normally, but many Subarus have a backup method where you can hold the fob directly against the start button to initiate the ignition.
Where can I buy a replacement battery for my Subaru key fob?
Replacement coin cell batteries (like CR2032 or CR1632) are widely available. You can find them at most grocery stores, drugstores, electronics retailers, hardware stores, and online marketplaces. Just be sure to get the correct type.
Conclusion
Learning how to replace Subaru key fob battery is a simple yet incredibly valuable skill for any Subaru owner. It’s a quick, inexpensive DIY fix that can save you from inconvenient lockouts and unnecessary trips to the dealership.
By understanding the signs of a dying battery, having the right tools on hand, and following our step-by-step guide, you’ll be prepared for anything the road – or the trail – throws your way. Remember, preparedness is key to enjoying your adventures without interruption.
So, the next time your Subaru key fob starts acting up, you’ll have the confidence and expertise to tackle the problem head-on. Stay safe, stay confident, and keep exploring!
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