Losing access to your vehicle because your Subaru key fob battery died can turn a routine day into an urgent problem. Replacing the battery in most Subaru key fobs is straightforward if you follow the right steps and use the correct tools.
This guide walks you through identifying your key fob model, gathering supplies, opening the casing, installing the new battery, and testing the remote to restore your security and convenience.
| Key Fob Model | Battery Type | Key Blade Feature | Typical Lifespan |
|---|---|---|---|
| Subaru Intelligent Key (Standard) | CR2032 3V Coin Cell | Fixed Blade | 2–3 years with regular use |
| Subaru Push-Button Start Key Fob | CR2032 3V Coin Cell | Fold-Away Blade | 3–5 years depending on usage |
| Subaru Proximity Key Fob | CR2032 3V Coin Cell | Fold-Away Blade | 3–5 years, possibly shorter with frequent keyless entry |
| Aftermarket Key Fob | CR2032 or equivalent 3V battery | Variable | Varies by build quality; check manufacturer specs |
Identify Your Subaru Key Fob Model
Before replacing the battery, confirm which key fob you have, because design differences affect how you open the casing and handle the internal components.
Standard Remote with Mechanical Key
This key fob has a small push button on the side to release a hidden metal key. The body is usually slim, and the battery compartment is accessible from the back after sliding or prying the front cover away.
Push-Button Start Fob
Common on newer Subaru models, this fob houses the remote inside a larger, often rubberized shell. It typically features a button to extend the key blade and may include panic or trunk release buttons on the shell.
Gather Tools and Replacement Battery
Having the right tools on hand makes the process faster and reduces the risk of damaging the key shell or accidentally scratching interior surfaces.
- New CR2032 3V coin cell battery
- Small flathead screwdriver or spudger
- Soft microfiber cloth
- Tape for securing the key fob after battery replacement
- Clean, well-lit workspace
You can purchase a CR2032 battery at most pharmacies, hardware stores, or online retailers, often sold in multipacks for future use.
Open the Key Fob Casing Safely
Apply gentle, even pressure to avoid cracking the plastic shell, especially on older key fobs where clips may be brittle.
Standard Key Fob with Metal Key
Locate the seam on the side opposite the key blade. Insert the flathead screwdriver or spudger, and carefully twist to separate the two halves of the fob. Slide out the metal key if it obstructs access to the battery tray.
Push-Button Start Key Fob
Use the screwdriver to gently pry along the edges of the rubber or plastic shell. Work slowly around the entire perimeter until the halves pop apart. If the shell feels tight, press the release button on the side to help disengage internal clips.
Replace the Battery and Reassemble
Handling the battery with clean hands reduces the chance of transferring oils that could affect performance.
Remove the Old Battery
Lift the battery from its tray using your fingernail or the screwdriver edge. Note the orientation of the positive and negative sides so you can match it when installing the new battery.
Install the New Battery
Place the new CR2032 battery into the tray with the correct polarity facing up. Press firmly until the battery sits flush in the tray without gaps.
Reassemble the Key Fob
Align the two halves of the key fob and press them together until all clips engage. For push-button start models, ensure the rubber shell is seated evenly to avoid gaps. Reinsert the mechanical key and verify that the remote buttons respond to your vehicle.
Test Remote Functions and Troubleshoot
After reassembly, confirm that your remote entry, panic, and trunk release buttons work as expected before heading out.
Check Remote Entry and Panic Features
Stand close to the vehicle and press the lock, unlock, and panic buttons. Watch the lights and listen for the chime to confirm each function is operating. If nothing happens, re-open the key fob and verify battery orientation and seating.
Verify Key Fob Detection by Vehicle
Start the engine with the key fob inside the vehicle to ensure the immobilizer recognizes the key. If the vehicle fails to recognize the fob, move closer to the steering column and retry, as weak signal strength can prevent recognition.
Maintain Your Subaru Key Fob for Long-Term Reliability
- Replace the battery at the first sign of reduced remote range or inconsistent button response
- Inspect the rubber seal and shell for cracks that could allow moisture inside
- Keep spare batteries on hand, especially during cold seasons when battery performance drops
- Avoid dropping the key fob or exposing it to harsh chemicals
- Test the remote functions after battery replacement to confirm full operation
FAQ
Reader questions
Why does my Subaru key fob stop working after a short time?
Intermittent failure is often caused by a weak battery, corroded contacts, or internal damage from water exposure. Replacing the CR2032 battery usually restores reliable operation.
Can I use any brand of CR2032 battery in my Subaru key fob?
Yes, most major brands of CR2032 batteries work safely in Subaru key fobs, but avoid ultra-cheap no-name batteries that may leak or lose charge quickly.
Will a dead key fob battery affect driving or starting the car?
You can still start and drive the vehicle by using the mechanical key or placing the fob near the start button, depending on your model, but keeping the fob battery healthy ensures remote convenience.
Is it safe to dispose of the old CR2032 battery in regular trash?
While local regulations vary, many areas encourage recycling lithium coin cells at designated battery drop-off points to reduce environmental impact.