Dealing with a dying Subaru Impreza key fob battery is one of those small automotive issues that causes immediate stress. You are standing near your car, pressing the button, and watching the doors refuse to budge while the key fob’s interior light feels dimmer than usual. This scenario is incredibly common for owners of models ranging from the late-90s GD chassis to the latest generations, and it is almost always the battery signaling for replacement.
Identifying a Failing Key Fob Battery
The signs of a weak battery are often subtle at first, making it easy to ignore until you are stranded. You might notice that the remote unlock range has shrunk significantly, requiring you to press the button right against the door handle. Alternatively, the dashboard lights on the key fob itself might appear dim or flicker, and you may have to physically press the button multiple times before the system responds.
Common Symptoms to Watch For
Complete failure of the remote to lock or unlock the doors.
Inconsistent operation where the fob works only when close to the car.
A visibly swollen or bloated key fob casing, indicating severe battery leakage.
Unusual beeping sounds from the fob when buttons are pressed.
Choosing the Correct Replacement Battery
Not all key fob batteries are created equal, and using the wrong type can lead to poor performance or damage to the sensitive electronics inside the fob. For the majority of Subaru Impreza models produced in the last two decades, the standard is the CR2032 3V lithium coin cell. This specific size provides the stable voltage required for the rolling code encryption that secures your vehicle.
Battery Specifications by Model Year
Model Year Range | Key Fob Style | Battery Type
1992–2001 | Thin, rectangular remote | CR2025 or CR2032
2002–2011 | Thicker remote with panic button | CR2032
2012–Present (GD/GE) | Modern design with immobilizer chip | CR2032 (sometimes CR2025)
The Step-by-Step Replacement Process
Replacing the key fob battery is a straightforward task that requires minimal tools and technical knowledge. The primary challenge usually involves prying the two halves of the fob apart without breaking the delicate plastic clips. With a little patience and the right technique, you can have a fresh battery installed in under five minutes.
Tools You Will Need
New CR2032 battery (recommended brand: Duracell or Energizer).
A small, thin flathead screwdriver or a coin.
A soft cloth to protect the fob from scratches during the process.
Step-by-Step Guide
Locate the small notch on the back seam of the key fob.
Insert the screwdriver or coin into the notch and apply firm pressure to pop the casing open.
Carefully lift the old battery out of its slot, noting the positive (+) side orientation.
Insert the new battery with the positive side facing up, ensuring it sits flush in the tray.
Align the two halves of the fob and press firmly until you hear all the clips snap into place.
