How To Change Battery In Subaru Crosstrek Key Fob

Ever found yourself miles from anywhere, maybe deep on a dusty trail or at a remote campsite, only to realize your Subaru Crosstrek key fob is refusing to unlock your doors? It’s a classic weekend warrior nightmare. A dead key fob battery can turn a simple errand into a frustrating lockout, or worse, leave you stranded when you need your vehicle most.

But don’t sweat it. This isn’t a job that requires a trip to the dealership or special tools. With a little know-how and a few minutes, you can easily handle this common issue yourself. We’re here to walk you through how to change battery in Subaru Crosstrek key fob quickly and confidently.

This comprehensive guide will not only show you the exact steps to replace your key fob battery but also provide crucial tips for off-roaders and DIY mechanics. You’ll learn what battery you need, the simple tools required, and even some troubleshooting for those moments when things don’t go exactly as planned. Let’s get that key fob working like new!

Table of Contents

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

Your keyless entry system relies on a small but mighty battery inside your key fob. Over time, like any battery, it will lose its charge. Understanding the signs of a dying battery can save you a lot of hassle.

Common Symptoms of a Dying Key Fob Battery

Before you even think about how to change battery in Subaru Crosstrek key fob, you need to confirm it’s actually the battery causing the problem. Here are the tell-tale signs:

Reduced Range: You have to be closer and closer to your Crosstrek for the remote to work.
Intermittent Functionality: Sometimes it works, sometimes it doesn’t, or it takes multiple presses.
No Response: The ultimate sign – pressing buttons does nothing at all.
Dashboard Warning: Many newer Crosstrek models will display a “Key Fob Battery Low” warning on the instrument cluster.
Delayed Response: There’s a noticeable lag between pressing a button and the car reacting.

Catching these early warnings means you can replace the battery proactively, avoiding a lockout situation.

Factors Affecting Key Fob Battery Life

Several things can shorten the lifespan of your Subaru Crosstrek key fob battery:

Frequent Use: The more you use your key fob, the faster the battery drains.
Proximity to Vehicle: Keeping the key fob close to your vehicle, even when not in use, can cause it to constantly communicate and drain faster.
Extreme Temperatures: Very hot or cold conditions can degrade battery performance and life.
Obstructions: Walls, other electronic devices, or even items in your pocket can cause the fob to work harder, using more power.

Typically, a Subaru key fob battery lasts about 2-3 years, but this can vary widely based on your habits and environment.

Essential Tools and the Right Replacement Battery

Replacing your key fob battery is a straightforward task that requires minimal equipment. Having the right battery and a few basic tools makes the process smooth and prevents potential damage.

Identifying Your Subaru Key Fob Battery Type (CR2032)

For most Subaru Crosstrek models, especially those from 2013 onwards, your key fob will use a single CR2032 lithium coin cell battery. This is a very common battery type, readily available at most grocery stores, drugstores, electronics shops, and online retailers.

Always double-check your owner’s manual or the existing battery once you open the fob to confirm the exact type. While CR2032 is standard, it’s good practice to verify.

Tools You’ll Need for the Job

Gathering your tools beforehand ensures a quick and seamless battery swap. Here’s what you’ll need:

New CR2032 Battery: Make sure it’s fresh and from a reputable brand.
Small Flat-Head Screwdriver: Or a coin, a guitar pick, or a plastic pry tool. Something thin and sturdy to gently open the key fob casing. Avoid using anything too sharp that could scratch the plastic.
Clean Work Surface: A well-lit, flat area where you won’t lose tiny parts.

Having these items ready will make the task of replacing your Subaru Crosstrek key fob battery a breeze.

Step-by-Step Guide: how to change battery in subaru crosstrek key fob

Now for the main event! Follow these steps carefully to replace your key fob battery without damaging the delicate internal components. This process is designed to be simple and safe for any DIYer.

Safely Opening the Key Fob Casing

Remove the Mechanical Key: First, locate the small release button or tab on the side or back of your key fob. Press it and pull out the emergency mechanical key. This key is crucial for manual entry if your fob ever completely dies.
Locate the Seam: With the mechanical key removed, you’ll see a small slot or seam where the two halves of the key fob casing meet. This is usually at the bottom or side of the fob, where the mechanical key was housed.
Gently Pry Open: Insert your small flat-head screwdriver, coin, or plastic pry tool into this slot. Twist or gently pry to separate the two halves of the casing. Work slowly and apply even pressure to avoid snapping any plastic tabs. You might hear a small click as the halves start to separate.
Separate the Halves: Once the initial separation is made, you can usually use your fingers to carefully pull the two halves apart. Be mindful of any internal circuit boards or buttons that might be attached to one side.

Removing the Old Battery

With the key fob open, you’ll see the circuit board and the coin cell battery. The battery is typically held in place by small metal clips.

Note Battery Orientation: Before removing the old battery, take a mental note or even a quick photo of its orientation. The positive (+) side usually faces upwards.
Gently Pry Out the Old Battery: Use your small screwdriver or pry tool to carefully lift the old CR2032 battery out of its housing. Be gentle with the metal clips; they can bend or break if forced.
Dispose of Old Battery: Safely discard the old battery according to local regulations.

Inserting the New CR2032 Battery

This is where your fresh battery comes into play. Correct installation is key to getting your remote working again.

Insert New Battery: Take your new CR2032 battery. Place it into the housing, ensuring the positive (+) side is facing the correct direction (usually upwards, matching the orientation of the old battery).
Secure the Battery: Press down gently until the battery clicks securely into place under the metal clips. Make sure it’s snug and doesn’t wobble.

Reassembling Your Key Fob

Putting everything back together is the final step in how to change battery in Subaru Crosstrek key fob.

Align the Halves: Carefully align the two halves of the key fob casing. Ensure no wires or circuit board components are pinched.
Snap Together: Press the two halves firmly together until you hear them click and feel them snap securely into place all around the perimeter.
Reinsert Mechanical Key: Slide the mechanical key back into its slot until it locks.

That’s it! Your key fob battery replacement is complete. Now it’s time to test it out.

Testing Your Key Fob and Troubleshooting Common Issues

After replacing the battery, the first thing you want to do is confirm everything is working as it should. Sometimes, however, you might encounter a snag.

Verifying Key Fob Functionality

Head to your Subaru Crosstrek and test the key fob:

Unlock/Lock Doors: Try locking and unlocking the doors from a reasonable distance.
Trunk Release: If your fob has a trunk release button, test that as well.
Panic Button: Give the panic button a quick press (and then cancel it quickly!) to ensure it activates.
Engine Start (Push-Button Start): For models with push-button start, ensure the car recognizes the fob and allows you to start the engine.

If all functions work, congratulations! You’ve successfully completed the process of replacing your Subaru Crosstrek key fob battery.

What If Your Key Fob Still Doesn’t Work?

Don’t panic if your key fob isn’t working immediately after the battery change. Here are some troubleshooting steps:

Check Battery Orientation: Double-check that the new CR2032 battery is inserted with the correct polarity (+ side up).
Battery Quality: Ensure the new battery is fresh and not expired. Sometimes, old stock batteries can be weak.
Clean Contacts: Carefully inspect the metal contacts inside the fob. If they appear dirty or corroded, gently clean them with a cotton swab and rubbing alcohol. Ensure they are dry before reassembly.
Bent Clips: Make sure the metal clips holding the battery are not bent or damaged, preventing proper contact. Gently adjust them if needed.
Key Fob Damage: If the key fob was dropped or exposed to water previously, there might be internal damage beyond just the battery.
Reprogramming (Rarely Needed): For most Subaru Crosstrek models, changing the battery does NOT require reprogramming the key fob. The internal memory usually retains its programming. However, in very rare cases, especially if the fob was without power for an extended period, reprogramming might be necessary. This usually requires specialized equipment at a dealership or locksmith.

Emergency Start Procedure for a Dead Key Fob

Even if your key fob battery is completely dead, your Crosstrek isn’t entirely useless. Every Subaru with a push-button start has an emergency start procedure:

Use Mechanical Key: Use the mechanical key you removed earlier to manually unlock the driver’s door.
Place Fob Near Start Button: Once inside, place the entire key fob (even if dead) directly against the push-button start switch.
Press Start: While holding the fob against the button, press the brake pedal and then press the start button as you normally would. The car’s immobilizer system should be able to read the transponder chip inside the key fob, even without battery power, and allow the engine to start.

This trick can be a lifesaver when you’re far from civilization.

Off-Road Readiness: Key Fob Battery Care in the Wilderness

For the FatBoysOffroad crew, preparedness is paramount. A dead key fob battery isn’t just an inconvenience; it can be a real problem when you’re miles from cell service or a parts store. Here’s how to integrate key fob battery care into your off-road planning.

Always Carry a Spare Battery

This is arguably the most important tip. Just like you carry spare fuses or a tire repair kit, a couple of spare CR2032 batteries should be in your glove box or emergency kit. They are small, light, and inexpensive, but their value in a pinch is immeasurable. Check their expiration dates periodically.

Protecting Your Key Fob from Elements

Off-roading means exposure to dust, mud, water, and extreme temperatures. These elements are not friends to your delicate key fob electronics:

Waterproof Pouch: Keep your key fob in a small waterproof bag or case, especially if you’re near water crossings or expecting rain.
Avoid Extreme Heat/Cold: Don’t leave your key fob baking on the dashboard in direct sun or exposed to freezing temperatures for extended periods. This can significantly shorten battery life and potentially damage internal components.
Dust and Dirt: Keep your fob away from excessive dust and dirt, which can ingress into the casing and interfere with buttons or contacts.

Dealing with a Dead Fob Far from Help

Even with preparation, sometimes things go wrong. If your Subaru Crosstrek key fob battery dies when you’re deep in the backcountry:

Manual Entry: Remember to use the mechanical key to get into your vehicle. Practice this at home so you’re not fumbling when it matters most.
Emergency Start: Utilize the emergency start procedure we discussed. It’s vital to know this by heart for push-button start vehicles.
Communication: If you’re truly stuck, assess your situation. Do you have a satellite communicator or two-way radio? Can you signal for help? Park rangers or experienced adventurers can often provide assistance or advice in remote areas.

Being self-sufficient is key. Knowing how to change battery in Subaru Crosstrek key fob and having spares is a fundamental part of that readiness.

Extending Your Key Fob Battery’s Lifespan

While eventually, every battery will die, you can take steps to maximize the life of your Subaru Crosstrek key fob battery and avoid premature replacement.

Avoiding Signal Interference

Your key fob is constantly sending out a low-power signal or listening for one. Minimize unnecessary power drain:

Keep Away from Electronics: Store your key fob away from other electronic devices like laptops, tablets, or even other car fobs, which can cause interference and lead to increased power consumption.
Don’t Store Near Your Car: If your car is parked in the driveway, avoid leaving your key fob right next to the front door inside your house. The constant communication can drain the battery faster.

Storage Tips

Proper storage also contributes to a longer battery life:

Cool, Dry Place: Store your spare batteries and your active key fob in a cool, dry place when not in use.
Dedicated Spot: Have a designated spot for your keys to prevent them from getting lost or damaged, which could lead to more frequent button presses while searching.

Frequently Asked Questions About Your Subaru Crosstrek Key Fob Battery

We get a lot of questions about key fobs, especially from owners who are new to DIY maintenance or off-road preparedness. Here are some of the most common ones.

How long does a Subaru Crosstrek key fob battery last?

Typically, a Subaru Crosstrek key fob battery, like the CR2032, will last anywhere from 2 to 4 years under normal usage. Factors like frequency of use, proximity to the vehicle, and exposure to extreme temperatures can shorten its lifespan.

Can I damage my key fob by changing the battery?

It’s possible, but unlikely if you follow the steps carefully. The most common issues are scratching the casing, bending the metal battery clips, or pinching wires if you’re not gentle. Using the right tools (a plastic pry tool or a small, flat-head screwdriver) and being patient will minimize any risk.

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

For most modern Subaru Crosstrek models, you do NOT need to reprogram the key fob after changing the battery. The internal memory that links the fob to your car usually retains its programming even when the battery is removed. Just swap the battery, reassemble, and test.

Where can I buy a replacement CR2032 battery?

CR2032 batteries are very common and widely available. You can find them at most supermarkets, drugstores (like CVS or Walgreens), electronics stores (like Best Buy), hardware stores, and online retailers such as Amazon. Look for reputable brands to ensure quality and longevity.

What if I don’t have the right tools to open the key fob?

If you don’t have a small flat-head screwdriver, you can often use a coin (like a quarter or nickel), a guitar pick, or even a sturdy fingernail file to gently pry open the key fob casing. The key is to use something thin but firm enough to get into the seam without causing damage.

Mastering how to change battery in Subaru Crosstrek key fob is a small but mighty skill that every Subaru owner, especially those who venture off the beaten path, should have in their toolkit. It’s a simple fix that can save you time, money, and a lot of frustration.

By keeping a spare CR2032 battery handy and knowing these steps, you’re not just prepared for a dead fob; you’re taking another step towards true off-road self-reliance. Keep those wheels turning and your key fob working!

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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.