The most common reason is a dead or dying key fob battery, but several other issues can prevent a Subaru remote from functioning. This article explains the likely causes, practical at-home fixes, and when to seek professional help.
Common causes of a non-functioning Subaru key fob
These are the issues most often responsible for a key fob that won’t unlock or start a Subaru vehicle.
- Dead or weak battery in the fob (usually a CR2032)
- Distance, interference, or obstruction between the fob and the car
- Weak or dead car battery or electrical system problem
- Fob that needs to be re-synced or reprogrammed after a battery change
- Water damage or physical damage to the fob
- Faulty receiver or antenna in the vehicle (less common)
If any of these apply, you’ll want to move from quick fixes to more formal solutions, especially if a battery replacement doesn’t restore function.
What you can try at home
Before contacting a dealer or locksmith, try these straightforward checks and fixes. They address the majority of everyday failures.
- Replace the key fob battery: Open the fob with a small flat tool or coin, replace the CR2032 battery with a fresh one, orient it correctly, and reseal the fob. Then test all buttons.
- Test the car battery and proximity: A weak car battery can prevent the vehicle from recognizing the fob. If the car won’t start or dashboard lights are dim, recharge or replace the car battery and re-check the fob.
- Use the spare fob: If the spare works but the primary fob does not, the issue is almost certainly with the original fob itself (battery, damage, or programming).
- Inspect for damage or moisture: Check for corrosion on the battery contacts inside the fob; if you see moisture or signs of water exposure, replace the fob and consider professional inspection.
- Re-sync or reprogram (model-dependent): Some models require a dealer or locksmith to re-pair the fob after battery replacement. If the owner’s manual doesn’t provide a DIY reprogramming method for your year, contact Subaru support or your dealer.
These steps cover the majority of at-home fixes. If the remote still fails after trying them, professional service is recommended to determine if a hardware fault or a dealer-only reprogramming is required.
When to contact Subaru or a locksmith
There are scenarios where professional help is the most reliable path to restore key fob functionality. A technician can confirm whether the issue is the fob, the car’s receiver, or the need for reprogramming. Consider reaching out if:
What a dealership or locksmith can do
Technicians can replace or reprogram the key fob, diagnose receiver issues, and verify synchronization between the fob and the vehicle. They can also cut and pair a new mechanical key if your model uses a physical backup key, and check for faults in the vehicle’s security system. Costs vary by model and year, but a new fob with programming can range from modest to several hundred dollars depending on coverage and warranty.
Preventive tips to avoid future key fob issues
Taking a few precautions can minimize disruptions from a malfunctioning Subaru key fob.
- Replace the fob battery proactively every 3–5 years, or as soon as you notice reduced range
- Use genuine or recommended batteries to avoid corrosion or poor contact
- Avoid exposing the fob to water, extreme heat, or heavy impacts
- Keep a spare fob in a safe place; test both fobs regularly
- If you recently replaced a battery, check if the fob needs re-synchronization with the car
Regular maintenance and cautious handling can extend the life of your Subaru key fob and reduce the likelihood of a sudden failure.
Summary
The most common cause of a Subaru key fob stopping work is a dead battery, but range, car electrical health, fob damage, and synchronization issues also play a role. Start with a battery replacement, test with a spare, and inspect for damage or moisture. If simple fixes don’t restore function, consult a Subaru dealer or qualified locksmith for reprogramming or replacement. With proper care and periodic checks, you can minimize disruption and keep your key fob reliable.
What to do when your Subaru key fob stops working?
Replace the old battery with a new CR2032 battery with the positive (+) side facing upward. Reattach the key fob casing by fitting the projections and recesses back together. Re-insert the emergency key. Test your Subaru key fob to ensure functionality.
How do I reset my Subaru key fob?
Open and close the door, then press lock or unlock on your key fob. Remove the key from the ignition, and the chime will sound once again. Open and close the door once more, then in approximately five seconds, the key fob should be working.
Can I drive my Subaru with a dead key fob?
Yes. If the fob battery is “dead” hold it really close to the start button. The little key is meant for getting in and as a valet key to lock your glove box. If the FOB is dead, use the physical key to unlock the door and use the dead FOB to push the start button.
What to do when your key fob stops working?
Troubleshooting a Key Fob Not Working
Replace it with a new one and test it again. If the key fob works intermittently or certain functions or buttons don't respond at all, it could be damaged inside. Check for worn-out buttons, loose internal connections, or corrosion inside.