Symptoms
- Have to be within a foot or two of the car for it to respond
- Worked fine from farther away before
- Sometimes takes several presses
- Range seems worse in cold weather
Likely causes
- CommonWeakening coin-cell batteryAs batteries age their voltage drops, cutting transmission range before they die completely.
- CommonCold temperaturesBattery chemistry is less efficient in the cold, temporarily shortening range.
- PossibleInterference from other electronicsPhones, other fobs, or nearby wireless devices on the same key ring can interfere with the signal.
- Less commonFob antenna or car receiver issuePhysical damage to the fob or a fault in the car's receiver can reduce range even with a good battery.
What to do
- Replace the fob battery even if it isn't fully dead; range loss is usually the first sign of a weak one.
- Remove other fobs, cards, or electronics from the same key ring since they can interfere with the signal.
- Test range again in a warmer spot if it's cold out, to see if temperature is the main factor.
- Check that the fob's battery contacts inside look clean and aren't bent or corroded.
- If range is still poor with a fresh battery, try a spare fob if you have one to compare performance.
- If all fobs show short range, the issue is likely the car's receiver rather than the fobs.
Tools and parts
- Small screwdriver
- Replacement coin-cell battery
Key fob batterySearch: “key fob replacement battery for your car model”
When to call a pro
If new batteries in all fobs don't restore range, have a dealer or locksmith check the car's receiver antenna and module.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.