Symptoms
- 'Key fob battery low' message on the dash
- Remote locking/unlocking range seems shorter than usual
- Push-button start may become inconsistent as the battery gets weaker
Likely causes
- CommonKey fob battery naturally depleting with ageThese small batteries typically last 1–3 years depending on use.
- PossibleFob exposed to extreme heat or cold, shortening battery lifeLeaving a fob in a hot car can accelerate battery wear.
- PossibleMultiple fobs and only one is actually lowWorth confirming which fob triggered the message if you have more than one.
What to do
- Identify which key fob is being used when the message appears, if you have more than one.
- Look up the correct replacement battery type and size for your specific fob (often listed in the manual).
- Open the fob following the manufacturer's method, usually a small tab or screw.
- Replace the battery, noting the correct polarity (which side faces up).
- Reassemble the fob and test locking/unlocking and starting the car.
- If replacing the battery doesn't fix inconsistent operation, the fob itself may need replacement or reprogramming.
Tools and parts
- Small screwdriver (flathead or Torx, depending on fob)
Key fob batterySearch: “correct battery size (e.g. CR2032) for your key fob”
When to call a pro
No professional needed for a simple battery swap; see a dealer if the fob still won't work reliably after a fresh battery.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.