How To Open Subaru Key Fob To Replace Battery

Ever found yourself stranded, frantically mashing your Subaru’s key fob buttons, only to be met with silence? Or maybe you’re out in the backcountry, gear loaded for an epic off-road adventure, and your remote start suddenly refuses to cooperate?

We’ve all been there. A dead key fob battery is a minor annoyance that can quickly become a major headache, especially when you need reliable access to your vehicle.

At FatBoysOffroad, we believe every car owner, from the daily commuter to the hardcore overlander, should feel confident tackling common vehicle maintenance tasks. That’s why we’re here to show you exactly how to open your Subaru key fob to replace the battery yourself, saving you time, money, and frustration.

In this comprehensive guide, we’ll walk you through the process step-by-step, cover different Subaru key fob types, and share some pro tips to ensure a smooth, successful battery swap. Get ready to regain control of your Subaru’s remote functions!

Table of Contents

Why Your Subaru Key Fob Battery Dies (And How to Spot It)

Your Subaru key fob isn’t just a fancy piece of plastic; it’s a miniature radio transmitter. It constantly sends out a signal, even when not actively being used, which slowly drains the internal battery.

Several factors contribute to battery depletion. Frequent use, extreme temperatures (think scorching desert trails or freezing mountain passes), and even proximity to other electronic devices can shorten its lifespan.

Common Symptoms of a Dying Key Fob Battery

Don’t wait until your key fob is completely dead to address the issue. Your Subaru will often give you subtle hints that the battery is on its way out.

Reduced Range: You have to be much closer to your Subaru for the remote functions to work.
Intermittent Operation: The lock or unlock buttons work sometimes, but not always.
Multiple Button Presses: You find yourself pressing the button several times to get a response.
Dashboard Warning: Newer Subaru models might display a “Key Fob Battery Low” message on your instrument cluster.
Remote Start Failure: Your remote engine start feature stops working consistently.

Addressing these signs early can prevent you from being locked out or unable to start your vehicle when you least expect it.

Gather Your Gear: Tools and Battery Types You’ll Need

Before you dive into the key fob surgery, it’s crucial to have the right tools and, most importantly, the correct replacement battery. This isn’t a job for brute force; precision is key.

Essential Tools for the Job

You won’t need a full toolbox for this task. A few common household items or specialized small tools will suffice.

Small Flathead Screwdriver: Ideal for prying open the casing. Jewelers’ screwdrivers work perfectly.
Plastic Pry Tool: A plastic trim removal tool or guitar pick can prevent scratches to the key fob casing.
Coin: A quarter or dime can sometimes be used to twist open specific key fob designs.
Clean Cloth or Microfiber Towel: To protect your key fob from scratches while working on it.

Avoid using anything overly sharp or metallic with excessive force, as this can damage the internal components or scratch the plastic casing.

Identifying the Correct Replacement Battery

The vast majority of Subaru key fobs use a standard coin-cell battery. However, the exact type can vary slightly depending on your Subaru model and the year it was manufactured.

CR2032: This is the most common battery type for modern Subaru key fobs, including many smart keys found in Outback, Forester, Crosstrek, and Ascent models.
CR1632: Some older or smaller key fob designs might use this slightly smaller battery.
CR2025: Less common, but still used in a few specific key fob variants.

To be absolutely sure, check your owner’s manual. Alternatively, once you open your key fob, the battery type will be clearly printed on the old battery itself. Always opt for a reputable brand of battery for longevity and reliability.

How to Open Subaru Key Fob to Replace Battery: Step-by-Step Breakdown

Now for the main event! This section will provide a detailed, actionable guide on how to open your Subaru key fob to replace the battery. We’ll cover the two most common types: the traditional remote key and the newer smart key.

Method 1: Opening a Traditional Flip Key or Remote Fob

Many older Subaru models (and some newer base models) use a traditional key with integrated remote buttons. The process for these is generally straightforward.

Retrieve the Key Blade (If Applicable): If your fob has a flip-out key, make sure it’s in the open position. For non-flip keys, simply proceed.
Locate the Seam or Notch: Look for a small seam running around the edge of the key fob or a specific notch designed for prying. Some fobs have a small slot near the key ring loop.
Gently Pry Open the Case: Insert your small flathead screwdriver or plastic pry tool into the seam or notch. Twist or gently pry to separate the two halves of the casing. Work slowly and carefully, applying even pressure.
Separate the Halves: Once you start to create a gap, continue to work your way around the seam until the two halves of the key fob casing come apart.
Remove the Old Battery: 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). Use your small screwdriver to gently lift the old battery out of its holder.
Insert the New Battery: Place the new CR2032 (or correct type) battery into the holder, ensuring it’s in the same orientation as the old one. The positive (+) side usually faces up.
Snap the Fob Back Together: Align the two halves of the key fob casing and firmly 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, trunk, panic, and remote start (if equipped).

Method 2: Opening a Subaru Smart Key (Push-Button Start Fob)

Subaru models with push-button start typically use a smart key fob, which looks a bit different and often has a hidden emergency key blade. This is a common task for owners of newer Outbacks, Foresters, Crosstreks, and Ascents.

Remove the Emergency Key Blade: Locate the small release button or switch on the side or back of your smart key fob. Press it and pull out the metal emergency key blade. This often reveals a small slot.
Locate the Pry Slot: With the emergency key removed, you’ll usually find a small, narrow slot inside the compartment where the key blade was housed. This is your access point.
Gently Pry Open the Case: Insert a small flathead screwdriver or a coin into this slot. Gently twist or pry the tool. You should hear a small click as the casing begins to separate.
Work Around the Seam: Once you have a small opening, use your plastic pry tool or the screwdriver to carefully work your way around the entire seam of the key fob, separating the front and back halves. Be patient and avoid excessive force.
Remove the Old Battery: Once the case is open, you’ll see the circuit board and the battery. Again, observe the battery’s orientation (usually positive side up). Gently pry the old battery out of its clip or holder.
Insert the New Battery: Place the new CR2032 battery (or specified type) into the holder, ensuring the positive (+) side faces up, just like the old one.
Reassemble the Fob: Align the two halves of the smart key fob and press them firmly together until they click. Ensure the emergency key blade slot is clear.
Reinsert the Emergency Key Blade: Slide the metal emergency key blade back into its slot until it clicks securely.
Test the Fob: Test all functions – lock, unlock, and ensure your Subaru recognizes the smart key for starting the engine.

Knowing how to open Subaru key fob to replace battery on your specific model can save you a trip to the dealership and get you back on the road, or trail, faster.

Troubleshooting & Common Pitfalls When Replacing a Key Fob Battery

While the process of replacing a key fob battery is generally simple, sometimes things don’t go exactly as planned. Here are some common issues and how to tackle them.

Key Fob Still Not Working After Battery Replacement

This is the most frustrating scenario. If your key fob remains unresponsive, consider these possibilities:

Incorrect Battery Orientation: Double-check that the new battery is inserted with the correct polarity (+/-). The positive (+) side usually faces up.
Dead or Faulty New Battery: It’s rare, but new batteries can sometimes be dead or defective. Try another fresh battery.
Poor Battery Contact: Ensure the battery is seated firmly in its holder and the metal contacts are clean and making good connection. Gently bend the contact tabs slightly if they seem loose.
Damage During Opening: Did you accidentally damage any internal components or the circuit board while prying? Inspect for bent pins or cracks.
Key Fob Needs Reprogramming: In very rare cases, especially after a prolonged period with a dead battery, your key fob might lose its pairing with your Subaru. Consult your owner’s manual or a Subaru dealer for reprogramming instructions.

Damaging the Key Fob Casing

Applying too much force or using the wrong tool can leave unsightly marks or even break the plastic tabs that hold the casing together.

Use Plastic Tools: Whenever possible, use a plastic pry tool instead of a metal screwdriver to minimize damage.
Apply Gentle, Even Pressure: Work slowly around the seam, rather than trying to force it open in one spot.
Consider a Replacement Casing: If your casing is severely damaged but the internal electronics are fine, you can often purchase an inexpensive replacement key fob shell online and transfer the internal components.

Static Electricity Concerns

Electronic components are sensitive to static electricity. While key fobs are fairly robust, it’s good practice to minimize risk.

Ground Yourself: Before touching the circuit board, touch a metal object to discharge any static buildup.
Avoid Carpeted Areas: Work on a non-carpeted surface to reduce static generation.

Most issues are easily resolved with a little patience and attention to detail. Don’t be afraid to take a breath and re-evaluate if you hit a snag.

Extending Your Key Fob’s Battery Life and General Maintenance

Once you’ve successfully completed the task of how to open Subaru key fob to replace battery, you might be wondering how to make that new battery last longer. A little preventative care goes a long way.

Tips for Maximizing Battery Life

Keep it Cool: Avoid leaving your key fob in direct sunlight or in a hot car for extended periods, as heat can degrade battery performance.
Avoid Other Electronics: Storing your key fob next to other electronic devices (like cell phones or laptops) can sometimes cause interference and lead to minor battery drain.
Use a Protective Case: A silicone or leather key fob cover can protect it from physical damage and extreme temperatures, potentially extending its life.
Remove Battery for Long Storage: If you plan to store your Subaru for an extended period (e.g., during winter storage for your off-road rig), consider removing the key fob battery to prevent parasitic drain.

When to Replace the Entire Key Fob

Sometimes, a new battery isn’t enough. If your key fob has suffered significant physical damage (e.g., run over by your rig on a trail, submerged in water), or if reprogramming attempts fail repeatedly, you might need a new one.

Replacement key fobs can be purchased from your Subaru dealership or, for some models, from aftermarket suppliers. Keep in mind that new key fobs almost always require professional programming by a dealership or a specialized locksmith.

Regular maintenance, even for small items like your key fob battery, ensures your Subaru is always ready for your next adventure, whether it’s a grocery run or a challenging off-road expedition.

Frequently Asked Questions About Your Subaru Key Fob Battery

What battery does a Subaru key fob use?

Most modern Subaru key fobs, especially those for smart keys (push-button start), use a CR2032 coin-cell battery. Some older or less common models might use a CR1632 or CR2025. Always check your owner’s manual or the old battery itself for the exact type.

How often should I change my Subaru key fob battery?

The lifespan of a key fob battery typically ranges from 2 to 4 years, depending on usage and environmental factors. If you notice any of the symptoms of a dying battery (reduced range, intermittent operation), it’s a good idea to replace it proactively.

Can I replace my Subaru key fob battery myself?

Absolutely! Replacing your Subaru key fob battery is a straightforward DIY task that requires minimal tools and can be completed in just a few minutes. Our guide above provides step-by-step instructions for both traditional and smart key fobs.

Do I need to reprogram my Subaru key fob after changing the battery?

In most cases, no. Simply replacing the battery should not require reprogramming your key fob to your Subaru. The internal memory usually retains the pairing information. If your key fob doesn’t work after a battery change, double-check the battery orientation and ensure the new battery is good.

What if I can’t open my Subaru key fob?

Ensure you are using the correct tool (small flathead screwdriver or plastic pry tool) and applying gentle, even pressure at the designated seam or slot. Some fobs can be a bit stubborn. If you’re really struggling, a quick search for a video specific to your exact Subaru model and year might provide a clearer visual guide. Avoid excessive force to prevent damage.

Power Up and Hit the Road!

There you have it! Learning how to open Subaru key fob to replace battery is a simple yet empowering DIY skill. It’s one of those small maintenance tasks that keeps your daily drives smooth and your off-road adventures uninterrupted.

No more fumbling with a dead fob when you’re trying to lock up camp, or trying to start your rig after a cold night in the wilderness. With a fresh battery, your remote functions will be crisp and reliable, just like your Subaru.

Remember, tackling these small projects yourself not only saves you money but also builds your confidence as a true FatBoysOffroad enthusiast. So grab that screwdriver, swap out that battery, and get ready for your next journey!

Stay safe and keep exploring!

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Thomas Corle

Founder & Automobile expert at FatBoysOffroad

Automobile expert and off-road enthusiast, sharing in-depth knowledge of vehicles, gear, and adventures. Helping readers make smart decisions and enjoy the thrill of off-roading safely and confidently.