In short: The most common battery for a Subaru Crosstrek key fob is the CR2032. This small, coin-shaped lithium battery is readily available, affordable, and provides reliable power for your key fob for about 2–3 years. Replacing it is a simple DIY task that will get your key fob working like new again in minutes.
Has your Subaru Crosstrek key fob suddenly stopped working? It’s a common headache, right? One minute you’re ready to unlock your car, and the next, nothing happens. Don’t worry, it’s usually just a dead battery. This little issue can be super frustrating, especially when you’re in a hurry or the weather isn’t great.
But the good news is, you don’t need a mechanic or a tech wizard to fix it. Replacing the battery in your Subaru Crosstrek key fob is a super straightforward task that most car owners can handle themselves. We’ll walk you through exactly what you need and how to do it, step by step. You’ll be back to easily locking and unlocking your car in no time, feeling confident and in control. Let’s get your key fob powered up and ready to go!
Understanding Your Subaru Crosstrek Key Fob Battery
Your Subaru Crosstrek key fob is a small, yet mighty device that lets you communicate with your car. It sends a signal when you press a button, telling your car to lock, unlock, open the trunk, or even start the engine remotely. All of this magic requires a tiny bit of power, and that’s where the battery comes in.
These key fob batteries are designed to be small and long-lasting. They are typically lithium coin cells, which are a popular choice for electronics because they are compact, deliver a steady voltage, and have a long shelf life. Over time, like any battery, they gradually lose their charge. You might notice your key fob starting to act sluggishly – maybe the range decreases, or eventually, it stops working altogether. This is a normal part of the battery’s lifespan.
Why Do Key Fob Batteries Die?
Several factors can contribute to your key fob battery needing a replacement:
Age: Even when not in use, batteries slowly discharge over time.
Usage: Frequent use of the key fob, especially pressing buttons unnecessarily, will drain the battery faster.
Environmental Factors: Extreme temperatures (hot or cold) can sometimes affect battery performance and longevity.
Battery Quality: While less common with reputable brands, lower-quality batteries might not last as long.
Knowing this helps you understand that replacing the battery is a routine maintenance item, not a sign of a bigger problem with your car.
The Proven Battery for Your Subaru Crosstrek Key Fob: CR2032
When it comes to the battery for your Subaru Crosstrek key fob, the undisputed champion is the CR2032. This is a very common and widely available battery that powers countless small electronic devices, from car key fobs to small remotes and even some simple medical devices.
The CR2032 is a 3-volt lithium coin cell battery. Here’s why it’s the go-to choice for your Crosstrek key fob:
Size: It’s compact and thin, perfectly fitting into the small confines of your key fob.
Voltage: Its 3-volt output is precisely what the key fob’s internal circuitry is designed for, ensuring optimal performance.
Availability: You can find CR2032 batteries almost anywhere – supermarkets, drugstores, electronics stores, and online.
Longevity: A single CR2032 battery typically lasts between 2 to 3 years, depending on usage and battery quality.
Cost-Effectiveness: They are very affordable, often sold in multi-packs for even better value.
What D o the ‘CR’ and ‘2032’ Mean?
CR: This prefix indicates that the battery is made of a lithium chemistry and is a cylindrical type (as opposed to prismatic).
2032: The numbers refer to the battery’s dimensions. ’20’ means it’s approximately 20 millimeters in diameter, and ’32’ means it’s approximately 3.2 millimeters thick.
It’s important to use the correct battery type. While other coin cells might look similar, using the wrong one could result in the key fob not working or even potentially damaging the electronics. For your Subaru Crosstrek, stick with the trusted CR2032.
Signs Your Subaru Crosstrek Key Fob Battery Needs Replacing
Before your key fob completely gives up the ghost, you might notice a few warning signs. Keeping an eye out for these can save you from the inconvenience of being locked out or unable to start your car remotely.
Here are the most common indicators that it’s time for a new battery:
Reduced Range: You have to be much closer to your car than usual for the key fob to work.
Slow Response: It takes longer for the doors to unlock or lock after you press the button.
Intermittent Operation: The key fob works sometimes, but not always. You might have to press the button multiple times.
No Response at All: The most obvious sign is when pressing the buttons does absolutely nothing, and your car doesn’t react.
Dashboard Light/Warning: Some vehicles might even display a warning on the dashboard indicating a key fob issue or low battery.
If you’re experiencing any of these symptoms, it’s a strong indication that your CR2032 battery is on its last legs and a replacement is in order.
DIY: How to Replace the Battery in Your Subaru Crosstrek Key Fob
Replacing the battery in your Subaru Crosstrek key fob is surprisingly simple and requires only a few common tools. This DIY-friendly process can save you time and money compared to going to a dealership.
Here’s a step-by-step guide:
What You’ll Need:
New CR2032 Battery: Ensure you have a fresh, unexpired CR2032 battery. It’s a good idea to buy a pack of them, as they are inexpensive and you’ll have spares.
Small Flathead Screwdriver or Plastic Pry Tool: A thin flathead screwdriver or a dedicated plastic pry tool (often called a “trim removal tool”) is ideal for gently separating the key fob housing. Using a plastic tool is recommended to avoid scratching the fob’s casing.
A Soft Cloth or Towel: To protect the key fob from scratches while you work.
Step-by-Step Replacement Process:
1. Locate the Seam: Take your Subaru Crosstrek key fob and examine it closely. You’ll see a seam running around the edge where the two halves of the plastic casing meet. Some key fobs have a small notch or slot, often on the side or near the keyring loop, which is designed to make it easier to open.
2. Gently Pry Open the Fob:
Gently twist the screwdriver or pry tool. You should feel and hear the casing begin to separate.
If there isn’t a distinct notch, carefully insert the tip of your tool into the seam at one end. Work your way along the seam, applying gentle pressure to ease the two halves apart. Be patient and work slowly to avoid damaging the plastic. It might be helpful to place the fob on a soft cloth.
3. Separate the Halves: Once you’ve worked your way around the seam, the two halves of the key fob should come apart. You might need to wiggle them a bit. Be careful not to force it, as there are small clips that can break.
4. Identify and Remove the Old Battery: Inside, you’ll see the circular CR2032 battery. It’s usually sitting in a small compartment. Notice how the battery is oriented – there will be a positive (+) and negative (-) side. The positive side typically faces upwards. Carefully remove the old battery. You might be able to lift it out with your fingers or gently pry it out with your tool.
5. Insert the New Battery: Take your new CR2032 battery and insert it into the battery compartment, making sure to orient it correctly. The positive (+) side (usually marked with a “+”) should face upwards, just like the old battery was. Ensure it sits snugly in place.
6. Reassemble the Key Fob: Carefully align the two halves of the key fob casing. They should snap back together easily. Gently press around the edges until the seam is no longer visible and the fob feels secure. Make sure there are no gaps.
7. Test the Key Fob: Once the fob is reassembled, test it to make sure it works. Stand near your Subaru Crosstrek and try pressing the lock and unlock buttons. The doors should respond immediately and reliably. If it works, congratulations! You’ve successfully replaced your key fob battery.
If the key fob doesn’t work, double-check that the new battery is inserted correctly (positive side up) and that the battery is making good contact. Ensure the fob is fully snapped back together.
Comparing Key Fob Battery Options
While the CR2032 is the standard, it’s worth briefly mentioning other battery considerations for context, though they aren’t directly applicable to replacing your Crosstrek key fob battery.
| Battery Type | Common Uses | Key Fob Compatibility | Notes |
| :————— | :———————————————- | :——————– | :————————————————————————————————- |
| CR2032 | Subaru Crosstrek Key Fobs, remotes, small electronics | Yes | Standard, widely available, cost-effective, reliable. |
| CR2025 | Smaller remotes, calculators, key fobs | Potentially (check manual) | Slightly thinner and smaller diameter than CR2032. May fit some, but not recommended unless specific. |
| CR2016 | Very small electronic devices, key fobs | Potentially (check manual) | Even thinner and smaller. Less common for modern car fobs. |
| AAA/AA Alkaline | Remote controls, toys, flashlights | No | Too large and wrong voltage for key fobs. |
| Rechargeable | Phones, laptops, power banks | No | Primarily for devices with higher power demands; not suitable for the low-power, long-life CR2032. |
It’s crucial to always use the battery specified by your vehicle manufacturer. Using a different type could lead to the key fob not functioning correctly or even causing damage. For the Subaru Crosstrek, the CR2032 is the proven and recommended battery.
Where to Buy Your CR2032 Battery
The beauty of the CR2032 battery is its widespread availability. You can pick one up from a variety of places, making it easy to get your key fob working again quickly.
Here are some common places to find them:
Supermarkets: Most major grocery store chains have a battery section, often near the checkout or in the small electronics aisle.
Drugstores/Pharmacies: CVS, Walgreens, Rite Aid, and similar stores almost always stock CR2032 batteries.
Electronics Stores: Best Buy and other electronics retailers will have them.
Big Box Retailers: Walmart, Target, and Costco usually carry them in multi-packs.
Hardware Stores: Home Depot and Lowe’s often have a selection of batteries.
Online Retailers: Amazon, eBay, and other online shopping sites offer a vast selection of CR2032 batteries, often in bulk packs for the best value per battery. Buying online can be convenient if you don’t need it immediately.
Tip: Buying batteries in multi-packs is usually more economical. Since a key fob battery can last 2-3 years, having a few spares on hand is a smart move.
Tips for Prolonging Your Key Fob Battery Life
While batteries have a finite lifespan, there are a few things you can do to help them last as long as possible:
Minimize Unnecessary Button Presses: Try not to press the buttons just to see if it works or out of habit. Each press sends a signal and uses power.
Avoid Extreme Temperatures: Don’t leave your key fob in scorching hot cars during the summer or in extremely cold conditions during the winter for extended periods.
Keep it Dry: Moisture can sometimes interfere with battery contacts and shorten its life.
Proximity is Key: When pressing buttons like lock or unlock, be reasonably close to your car. Holding the fob at a distance that requires it to boost its signal will drain the battery faster.
Consider a Battery Replacement Service: If you’re uncomfortable doing it yourself, many auto parts stores and even some locksmiths offer key fob battery replacement services for a small fee.
Following these tips can help you get the most out of your CR2032 battery.
When to Consider a New Key Fob (Not Just a Battery)
While a dead battery is the most common reason for a non-responsive key fob, there are times when the fob itself might be damaged or malfunctioning beyond a simple battery swap. Here’s when you might need to consider replacing the entire key fob:
Physical Damage: If the key fob has been dropped hard, run over, or subjected to significant impact, the internal circuitry could be damaged. Cracks in the plastic, broken buttons, or water damage are also indicators.
Corrosion: If the key fob has been exposed to moisture or corrosive substances, it can lead to corrosion on the battery terminals or internal components, preventing it from working even with a new battery.
Button Wear: Over many years, the rubberized buttons on the key fob can wear out, becoming sticky or unresponsive.
Fob Not Recognized by the Car: In rare cases, even with a new battery and no visible damage, the car’s system might stop recognizing the key fob. This can sometimes be due to a failure in the fob’s transmitter or the car’s receiver system.
Lost or Stolen Fob: Obviously, if your key fob is lost or stolen, you’ll need a replacement.
If you’ve replaced the battery and tried these steps without success, it’s likely time to look into getting a new key fob programmed for your Subaru Crosstrek. You can typically get these from a Subaru dealership or a specialized automotive locksmith.
Frequently Asked Questions About Subaru Crosstrek Key Fob Batteries
Here are answers to some common questions beginner car owners might have about their key fob batteries:
Q1: How long does a Subaru Crosstrek key fob battery typically last?
A1: A CR2032 battery in a Subaru Crosstrek key fob usually lasts between 2 to 3 years. This can vary depending on how often you use the fob and environmental factors.
Q2: Can I use a different battery size if I can’t find a CR2032?
A2: It’s best to stick to the CR2032. While other coin cell batteries might look similar (like CR2025 or CR2016), they have different dimensions and voltage outputs. Using the wrong battery might not power the fob correctly or could potentially damage it.
Q3: My key fob isn’t working after replacing the battery. What should I do?
A3: First, double-check that you inserted the new CR2032 battery correctly, with the positive (+) side facing up. Ensure the battery is making good contact and that the key fob casing is snapped back together securely. If it still doesn’t work, the battery might be faulty, or the key fob itself could be damaged. You may need a replacement key fob.
Q4: Where can I find instruction manuals for my Subaru Crosstrek key fob?
A4: Your Subaru Crosstrek owner’s manual is the best place to find specific instructions for your key fob. You can usually find a digital version on the official Subaru website.
Q5: Is it safe to replace the key fob battery myself?
A5: Yes, it is generally very safe to replace the key fob battery yourself. Just be gentle when prying the fob open to avoid breaking any plastic parts. Always use the correct battery type.
Q6: Can a dead key fob battery affect my car’s ability to start?
A6: If your Subaru Crosstrek has a push-button start and a dead key fob battery, your car might not recognize the key to allow it to start, or it may alert you that the key fob battery is low. Some systems have a backup method, like holding the fob near the start button, but it’s always best to replace the battery promptly.
Q7: Do I need to reprogram my key fob after changing the battery?
A7: No, typically you do not need to reprogram your key fob after just changing the battery. The programming is stored within the fob’s internal chip and is independent of the battery’s power supply.
Conclusion
Dealing with a dead key fob battery for your Subaru Crosstrek doesn’t have to be a major inconvenience. As we’ve covered, the CR2032 is the reliable, readily available, and cost-effective solution. With just a few minutes and a small screwdriver, you can easily swap out the old battery for a new one and restore full functionality to your key fob.
Remember to keep an eye out for the warning signs – reduced range, slow response, or complete failure – which indicate it’s time for
