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What Causes Car Keys to Stop Working?

The usual reasons a car key or fob quits, and how each one gets sorted.

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A car key stops working for a handful of common reasons: a worn key blade, a dead fob battery, a chip or fob that has lost its pairing, a worn ignition, or a key that has cracked inside. The fix depends on which one it is, and our car locksmith team can tell them apart at your vehicle.

Worn metal keys round off over years of use until they no longer line up the pins. A fresh cut, or a code-cut key, brings it back. For chipped keys, the electronics can drop their pairing, which calls for transponder programming. For remotes and push-button fobs, a dead battery or lost pairing is common, handled through fob service or a new fob.

When it is the car, not the key

If a known-good key will not turn or start the car, the ignition cylinder may be the cause. A key that snapped off needs broken key extraction before anything else. Once you have a key that works, a backup through car key copying keeps a single failure from stranding you.

We help drivers across Raleigh and the Triangle. Contact us with your make and model.

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Frequently Asked Questions

Why did my car key suddenly stop working?
Common causes are a worn key, a dead fob battery, lost chip pairing, a worn ignition, or a cracked key.
Can a worn car key be fixed?
Yes. A fresh cut or a code-cut key restores the correct shape so it lines up the pins.
My fob died. Is that the battery?
Often, yes, but it can also be lost pairing. We handle both.
What if a good key will not turn?
That points to the ignition cylinder, which we inspect and service.

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The Short Version

If you only take one thing from this, take this: handling a lock problem on purpose, before it becomes a crisis, is almost always cheaper and calmer than handling it in a panic at the worst possible moment. A little planning, a spare key, a rekey after a move, goes a long way.