How to Change the Battery in A Subaru Key Fob
How Do You Change the Battery in a Subaru Key Fob?
To change the battery in a Subaru key fob, open the fob carefully, remove the old coin battery, insert a new battery with the correct polarity, snap the fob closed, and test it. Most Subaru key fobs use a CR2032 or CR2025 battery, but you should confirm your exact battery type in your owner’s manual.
This guide walks you through the exact steps, common battery types, troubleshooting, and what to do if your key fob still does not work.
What Battery Does a Subaru Key Fob Use?
Most modern Subaru key fobs use:
• CR2032 battery
• CR2025 battery
The correct battery depends on your model year and whether you have a traditional key fob or push button start smart key.
To confirm:
• Check your owner’s manual
• Look at the battery inside your current fob
• Contact your local Subaru service department
How to Change the Battery in a Subaru Key Fob
Follow these steps carefully.
Step 1: Remove the Physical Key
If your Subaru has a push button start key fob:
• Press the small release button
• Slide out the emergency key
If you have a traditional remote key, you may not need this step.
Step 2: Open the Key Fob
Look for a small notch along the seam of the key fob.
• Insert a flathead screwdriver or plastic pry tool
• Gently twist to separate the two halves
Do not force it. Apply light pressure to avoid cracking the casing.
Step 3: Remove the Old Battery
Once opened:
• Locate the coin battery
• Use a small screwdriver or fingernail to lift it out
• Note the battery orientation before removing it
Pay attention to the positive and negative sides.
Step 4: Install the New Battery
Insert the new battery in the same direction as the old one.
• Match the polarity markings inside the fob
• Ensure it sits flat in the compartment
Incorrect placement will prevent the key fob from working.
Step 5: Snap the Key Fob Closed
Align the two halves of the casing.
• Press firmly until you hear it click into place
• Reinsert the emergency key if applicable
Step 6: Test the Key Fob
Stand near your vehicle and press:
• Lock
• Unlock
• Remote start if equipped
If the vehicle responds, the battery replacement was successful.
Do You Need to Reprogram a Subaru Key Fob After Battery Replacement?
In most cases, no.
Replacing the battery does not usually require reprogramming. However, if the fob does not respond:
• Sit inside the vehicle
• Press the start button with the key fob
• Try locking and unlocking multiple times
If it still does not work, professional programming may be required.
Why Is My Subaru Key Fob Not Working After Battery Replacement?
Common reasons include:
• Incorrect battery type
• Battery installed upside down
• Weak or expired replacement battery
• Damaged internal contacts
• Water exposure inside the fob
If the fob blinks but the vehicle does not respond, programming may be needed.
How Much Does a New Subaru Key Fob Cost?
If your key fob is lost or damaged beyond repair:
Estimated costs:
• Replacement key fob: $50 to $200
• Programming fee: $50 to $150
Costs vary depending on:
• Model year
• Push button start vs traditional key
• Remote start capability
Programming typically requires dealership equipment or a qualified automotive locksmith.
When Should You Replace the Subaru Key Fob Battery?
Common signs include:
• Reduced remote range
• Intermittent unlocking
• “Key not detected” message
• Complete failure to lock or unlock
Most key fob batteries last 2 to 4 years.
Subaru Key Fob Battery Replacement Checklist
Use this quick checklist:
• Confirm correct battery type
• Remove emergency key
• Pry open carefully
• Replace coin battery with correct polarity
• Snap closed
• Test all buttons
If it still does not work, schedule service.
Need Help With Your Subaru Key Fob?
If your Subaru key fob still does not function after replacing the battery, the service team at Walser Subaru St. Paul can:
• Diagnose key fob issues
• Replace damaged fobs
• Program new smart keys
• Order OEM Subaru key replacements
Key fob issues are usually quick to fix and can often be resolved the same day.
To change the battery in a Subaru key fob, open the fob, replace the coin battery with the correct type, snap it closed, and test it. Most Subaru key fobs use a CR2032 or CR2025 battery and do not require reprogramming after replacement.