Symptoms
- Pressing the fob buttons does nothing
- No chirp, flash of lights, or click from the car
- May work only when very close to the car, or not at all
- Other functions like remote start (if equipped) also fail
Likely causes
- CommonDead or weak fob batteryThese small batteries typically last one to several years and are the most common cause.
- PossibleFob needs reprogramming/resyncingA dropped fob, a dead 12V battery event, or electrical work can sometimes desync a fob.
- PossibleFailing door lock receiver module in the carThe car's receiver for the fob signal can fail independent of the fob itself.
- Less commonRadio interferenceStrong nearby radio signals can occasionally interfere with a fob's signal.
What to do
- Try the fob very close to the door (within a foot or two) to rule out a battery that's just weak rather than fully dead.
- Replace the fob's battery with the correct type, available at most hardware and battery stores.
- Try a spare fob if you have one, to see if the problem is fob-specific or car-specific.
- Check that keyless entry hasn't been disabled in a vehicle settings menu, if your car has one.
- If a fresh battery doesn't help, look up your vehicle's fob reprogramming or resync procedure, which is sometimes simple enough to do yourself.
- Have a dealer or locksmith reprogram or diagnose the fob and receiver if the above doesn't resolve it.
Tools and parts
- Small screwdriver (to open the fob)
- Replacement fob battery
Key fob batterySearch: “key fob battery for [year make model] remote”
When to call a pro
A dealer or automotive locksmith can reprogram a fob or diagnose the car's receiver if a new battery doesn't solve it.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.