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Quick answer
A dead key fob almost never means you are stuck. Most push-button cars have a backup start: press the brake and hold the fob right against the Start/Stop button (or a spot your manual shows), then press. To get in, use the metal key hidden inside the fob. Jeep's Wrangler manual, for example, says to put the nose of the fob, the end with the metal key, against the START/STOP button and push.
Get a spare cell for the glovebox: match the code on your old battery.
Duracell CR2032 Panasonic CR2025 Energizer CR2450Step by step
- Pull out the metal key. Most fobs have a small release button or slide. Press it and pull the key out.
- Unlock the driver's door. Use the keyhole on the handle. If you don't see one, it is often under a small cap on the handle. Your manual shows how to pop it off. Some cars sound the alarm when unlocked this way; it should stop once the car starts.
- Press the brake (or the clutch in a manual car) and make sure the car is in Park.
- Hold the fob against the Start button and press. Use the end or face your manual describes. Some cars use a marked spot on the console or steering column instead of the button.
- Replace the battery soon. The backup start is for getting home, not daily use. See which battery your fob takes.
If it still won't start
Move phones and other electronics away from the fob, since Jeep's manual notes these can block the fob's signal. Try your spare fob. If the dash shows no message at all and the lights are dim, the problem may be the car's own 12-volt battery rather than the fob.
How we work: the backup start steps come from carmakers' owner's manuals. The exact spot to hold the fob differs between models, so check yours. Sources are listed below.
Questions people ask
Can you start a push-button car if the key fob battery is dead?
In most cars, yes. Owner's manuals describe a backup method: press the brake and hold the fob right against the Start/Stop button (or a marked spot) and press. Jeep's Wrangler manual, for example, says to put the nose of the fob against the START/STOP button and push.
How do I unlock the door when the fob buttons don't work?
Most fobs hide a metal key. Press or slide the release on the fob and pull it out, then use it in the driver's door lock. If you don't see a keyhole, it is often under a small cap on the door handle; your owner's manual shows how to remove it.
Why did the alarm go off when I opened the door with the metal key?
On some cars, unlocking with the metal key sets off the alarm until the car recognizes the fob. Get in, press the brake, and start the car with the backup method. The alarm should stop once the car starts. Your owner's manual explains how your model behaves.
Sources
Last checked Oct 23, 2026. WARNING: Lithium coin batteries are a severe ingestion hazard for children. Keep new and used cells locked away and check your vehicle owner's manual for exact fob specs.
