What to Do When Your Key Fob Battery Dies: Emergency Entry & Starting Your Car

1. Recognize a Dead Key Fob Battery

Common signs include:

• No response when pressing lock/unlock buttons
• Warning message on your dash (“Key Battery Low” or similar)
• Reduced range—you have to be inches from the door or start button

If your fob behaves this way, proceed immediately to the emergency-entry steps below.

2. Use the Hidden Mechanical Key

Nearly every modern fob houses a physical key blade:

1. Locate the release latch—often a small slider or button on the fob’s side.
2. Pull out the mechanical key and use it in the driver’s door lock (look for a concealed keyhole cover under the exterior handle).
3. Turn the key to unlock manually. If your vehicle has a hidden key slot under the door handle, consult your owner’s manual—many “keyless” cars still provide mechanical access .

3. Start the Engine with a Dead Fob

Depending on your vehicle:

• Push-Button Start Override: Some models let you hold the dead fob against the push-button start or a marked spot on the steering column. The car senses the chip by induction and allows ignition.
• Key Slot: Luxury brands (e.g., BMW, Mercedes) often include a discreet fob-only key slot, usually hidden in the center console or under the dash—again, check your manual.
• Backup Slot: Vehicles like Honda and Hyundai sometimes have a backup slot in the glove box or console where you insert the fob directly.

Consult your manufacturer’s instructions for the exact fob-override procedure.

4. Replace the Battery Immediately

Once you’re inside and the car is running, swap the fob battery as soon as possible to restore normal remote functionality:

1. Open the fob—use a small flat-head screwdriver or pry tool at the seam.
2. Note the orientation of the old coin-cell (CR2032, CR2025, etc.).
3. Install a fresh cell (available at drugstores or auto parts stores).
4. Reassemble and test lock/unlock and remote-start functions.

5. Emergency Workarounds & Backup Plans

• Keep a Spare Fob in a safe location (home, office, or with a trusted friend).
• Carry a Secondary Coin-Cell in your glove box so you can swap batteries roadside.
• Roadside Assistance—if you have an extended warranty from a Cuvrd partner and you’re locked out or unable to start, contact roadside assistance for emergency help.
• Reprogramming: If swapping the battery doesn’t restore function, the fob may need reprogramming—dealerships and locksmiths can handle this.

6. Tips to Prolong Fob Battery Life

• Replace proactively every 1–2 years, even before it dies.
• Avoid moisture & impacts—store the fob in a protected pocket or case.
• Limit accidental presses—keep the fob away from other buttons or items that can trigger unintended signals.

Conclusion

A dead key fob battery doesn’t have to leave you stranded. With the hidden mechanical key, push-button overrides, and a quick battery swap, you can regain entry and start your car in minutes. Keep a spare cell or fob handy, and consider roadside-assistance coverage for total peace of mind on every journey.