A Subaru key fob keeps your daily drive smooth and convenient, but a weak or dead battery can leave you pressing buttons with no response. The good news is that replacing the battery is simple and takes only a few minutes.
A fresh battery restores full function to your key fob, allowing you to lock, unlock, and start your vehicle without frustration. This small maintenance task saves you time and avoids the cost of unnecessary dealer visits.
Most Subaru models use a standard coin-cell battery, and the process requires only a flat tool and a few easy steps. Understanding how to change it yourself builds confidence and keeps your vehicle ready for every trip.
This guide walks through each detail so you can complete the replacement quickly and safely, ensuring your Subaru key fob stays dependable whenever you need it.
How to Change Battery In Subaru Key Fob?
A Subaru key fob adds comfort to your driving experience by allowing remote access and push-button start without taking the key out of your pocket.
But over time, the small coin battery inside it weakens. You may notice the car doors not responding, or the fob only works when held close to the vehicle. These are clear signs that it’s time to replace the battery.
Replacing the battery in a Subaru key fob is easy. You don’t need special tools or expert help. A few minutes and the right battery are enough.
This guide will walk you through every step, explain the process for different Subaru key fob types, and help you avoid common mistakes.
Tools and Items You Need
Before starting, gather the following:
-
A new CR2032 battery (most Subaru key fobs use this)
-
A small flathead screwdriver or a coin
-
A soft cloth or towel (to protect your key fob from scratches)
-
A clean, flat surface for easy handling
Tip: Some Subaru models, such as older Outback or Legacy versions, may use a CR1620 battery instead of CR2032. Always check your owner’s manual or look at the old battery before buying a new one.
Step-by-Step Guide to Replace Subaru Key Fob Battery
Step 1: Remove the Mechanical Key
On the back of your key fob, there’s a small silver or black release button. Push it sideways while pulling out the small metal key. This hidden key can unlock your car manually, but it also exposes the gap you’ll use to open the fob.
Step 2: Open the Key Fob Case
Hold the key fob firmly and insert the tip of a flathead screwdriver or a coin into the small opening near the metal key slot. Gently twist to separate the two halves of the key fob.
Move slowly to avoid breaking the plastic clips inside. You should hear a small pop as the case opens. Lay both halves on a clean cloth to avoid losing any parts.
Step 3: Identify and Remove the Battery
Inside the fob, you’ll see a small round silver battery sitting in a holder. Note the direction of the positive side (the side with the “+” sign).
This side should face up. Use the screwdriver tip or your fingernail to carefully lift the old battery out. If the battery feels stuck, do not force it out. Gently lift from one edge until it pops free.
Step 4: Insert the New Battery
Place the new CR2032 battery into the holder with the “+” side facing up. Press it down gently until it sits firmly in place. Make sure it’s flat and secure.
Double-check the battery orientation before closing the case. Placing it upside down will stop the fob from working.
Step 5: Close the Key Fob Case
Align the two halves of the key fob and press them together until you hear a click. Run your finger around the edges to make sure there are no gaps. Slide the mechanical key back into its slot until it locks into place.
Step 6: Test the Key Fob
Press the lock or unlock button. The car lights should flash or the doors should respond. If the fob does not work, remove the battery and reinsert it. Ensure it’s seated correctly and the positive side is facing up.
Common Subaru Key Fob Designs
Subaru key fobs come in a few designs depending on the model year and trim.
Smart Key Fob (Push-Button Start Models)
Used in models like Subaru Outback, Forester, Crosstrek, Ascent, and Legacy with keyless entry and push-button start.
-
Battery type: CR2032
-
Has a slot for a hidden key
-
Two halves that separate easily
Standard Remote Key Fob
Used in older models with a physical key ignition.
-
Battery type: CR1620 or CR2025
-
May have a screw holding the two halves together
-
Has simple lock/unlock buttons
Knowing your fob type helps you identify the right battery and avoid mistakes.
Signs That the Battery Is Dying
A weak key fob battery doesn’t fail all at once. It shows signs before dying completely:
-
The range gets shorter; you must stand closer to your car.
-
The door locks or trunk take longer to respond.
-
The push-start button flashes a key symbol or warning message.
-
The fob light doesn’t blink when pressing buttons.
-
The car displays “Key Fob Battery Low” on the dashboard.
Replacing the battery early avoids being locked out or unable to start your car.
How Often to Change a Subaru Key Fob Battery?
The average Subaru key fob battery lasts two to three years, depending on use and climate. Extreme temperatures both hot and cold can shorten battery life.
If you use your vehicle daily, plan to replace the battery every 18 to 24 months. Keeping a spare battery in your glove box or home toolbox is always a smart idea.
Tips to Extend Key Fob Battery Life
-
Avoid storing the fob in direct sunlight or near heat.
-
Keep the key fob away from electronic devices that send wireless signals.
-
Clean the fob regularly using a dry cloth to remove dust and dirt.
-
Use trusted brands like Panasonic, Duracell, or Energizer for longer life.
-
Don’t press the buttons unnecessarily. Each press drains a little power.
Troubleshooting After Replacement
If your Subaru key fob doesn’t work after replacing the battery, check these things:
-
Battery Position: The positive side should face up.
-
Battery Contact: Make sure the battery touches the metal connectors inside.
-
Battery Quality: Some new batteries can be old stock. Try another one.
-
Internal Damage: If the fob was dropped or got wet, internal parts may be damaged.
In rare cases, the key fob might need to be reprogrammed by a Subaru technician, but this is uncommon.
FAQs
Q1. What size battery does a Subaru key fob use?
Most Subaru key fobs use a CR2032 coin battery. Some older models may use CR1620 or CR2025.
Q2. Can I use any brand of CR2032 battery?
Yes, but well-known brands usually last longer and perform better.
Q3. Do I need to reprogram my key fob after replacing the battery?
No, Subaru key fobs keep their memory even after the battery is replaced.
Q4. My key fob still doesn’t work after changing the battery. What should I do?
Check the battery position, clean the contacts, or try another new battery. If it still fails, visit a Subaru dealer for inspection.
Q5. Can I change the battery without tools?
You can use a coin or even your car key to open the fob, but a small flathead screwdriver makes it easier and safer.
Conclusion
Replacing a Subaru key fob battery is a simple task anyone can do at home. A few careful steps, the right battery, and a small screwdriver are all you need.
Regular maintenance keeps your key fob working smoothly and avoids last-minute trouble. With a fresh battery, your Subaru key fob will work just like new ready to lock, unlock, and start your car with ease.