Symptoms
- Buttons on fob don't unlock or lock doors
- Fob light (if equipped) doesn't blink when pressed
- Key blade still opens the door manually
- Problem is worse in cold weather
Likely causes
- CommonDead or weak fob batteryThis is by far the most common reason remote lock/unlock stops working.
- PossibleFob out of range or blockedStanding too far away or having the signal blocked by your body or a bag reduces range.
- PossibleDoor lock actuator failureA failed actuator in one door can prevent that door from responding even though the fob signal is fine.
- Less commonCar's receiver module issueA fault in the car's receiver can affect all doors at once.
What to do
- Replace the fob battery first since this resolves most cases.
- Get closer to the car and press the button again, aiming the fob at the vehicle.
- Test if only one door fails to unlock (suggesting an actuator) versus all doors (suggesting the fob or receiver).
- Manually unlock with the key blade if available and see if the door locks/unlocks normally by hand.
- Listen for a clicking or grinding sound at a door when pressing the fob button; a bad actuator often makes noise.
- If all doors fail with a known-good fob and fresh battery, have the receiver module checked.
Tools and parts
- Small screwdriver
- Replacement coin-cell battery
Key fob batterySearch: “key fob battery for your car model”
Door lock actuatorSearch: “door lock actuator for your car make, model, and year”
When to call a pro
If one door's actuator has failed, a mechanic can replace it; if all doors are affected with good batteries, have the receiver module diagnosed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.