Why does a key fob stop working, and when does it need replacing?
A key fob is a small radio transmitter. On newer cars it is also what tells the vehicle you are allowed to drive it. Most fobs fail for ordinary reasons: a worn-out battery, buttons rubbed smooth, a cracked case after too many drops, water damage, or the fob simply going missing. The cause matters, so we start by working out which one you are dealing with.
If the fob has only been getting sluggish, change the battery first. It is the lighter-cost thing to rule out. If a fresh battery changes nothing, or the dash keeps saying the key is not detected, the fob has probably failed or fallen out of sync with the car. That is when replacement and programming come in.
Many push-button cars have some backup way to start with a dead fob, such as a spot to hold it near the start button. Where that spot is varies by vehicle, so your owner's manual is the first place to look.
- Lock and unlock only work when you stand right next to the car, or only some of the time
- The dash warns that the key is not detected even though it is in your pocket
- The case is cracked, the buttons are worn through, or the fob has been through water
- The car will not start with the button even with a fresh fob battery
- You have lost a fob, or you are down to one working key
Which kinds of key fobs and smart keys do you replace?
People use the word fob for at least four different things, and the right replacement depends on which one you are holding.
We handle remote car key replacement and push to start key replacement for many makes and models. The word many is deliberate. Some vehicles need equipment or access that only the dealer has, and some model years sit in a gray area where the information conflicts. We do not guess. We confirm by VIN and, where needed, in person at the vehicle. If yours is dealer-only, we say so plainly rather than start a job we cannot finish.
If your key is a chip-type key with no buttons at all, that is closer to transponder key programming, which has its own page. If the fob is fine but the key will not turn in the ignition, that is an ignition repair question, not a fob one.
- Remote head keys and flip keys: a metal blade joined to a remote, either in one piece or folding
- Separate remotes: a stand-alone remote for lock, unlock, trunk and panic, used alongside a regular key
- Proximity keys: the smart car key replacement most people ask about, which lets you unlock at the handle and start with a button while the fob stays in your pocket
- The emergency blade: many smart keys hide a small mechanical key for a dead fob, and it can be cut separately
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How does key fob programming work, step by step?
Here is how a typical mobile key fob programming job runs for a Santa Clarita driver. The details shift by vehicle, but the order does not.
- Call (213) 577-1366. A person answers around the clock. Tell us the year, make and model, what kind of key you have, how many working keys remain, and where the car is parked.
- We identify the fob. Using your VIN, we work out which fob your car takes and which programming route applies. If it is a dealer-only situation, you hear that first.
- We confirm you own the vehicle. Expect to show ID and registration or title that matches the car. It protects you, and a locksmith who skips it will program a fob for anyone.
- We come to the vehicle. The van brings the equipment to your driveway, parking structure or curb, so in most cases you avoid a tow.
- We prepare the fob. That means supplying the new fob, cutting the emergency blade if your key has one, and readying it to pair.
- We program and test. After pairing, we test every button, the door unlock, the trunk, and starting the engine. On smart keys we also check that the car detects the fob.
- We talk about spares. With the equipment already out, it is the sensible moment to add a spare, and we explain what that involves for your vehicle.
Can you make a new fob if I have lost every key?
Often, yes, but it is a bigger job than copying from a working key, and we will not pretend otherwise. With one working fob in hand, the car can usually be taught a new one from there. With every key gone, the vehicle's security has to be handled from scratch, and how depends on the make, model and year. Some cars can be done at your curb and some are dealer-only. We confirm by VIN before anything is ordered or cut.
Our lost car key replacement page covers that situation in more depth, and car key replacement covers keys of every type. This page stays on fobs: remotes and smart keys.
If a lost fob could end up in someone's hands, ask us whether it can be removed from the car's memory. That varies by vehicle, and we will check yours.
What affects the cost of key fob replacement in Santa Clarita?
We do not put numbers on a web page, because an honest fob quote depends on facts we cannot see until you describe the car. These are the things that move the total:
The dealer route and the mobile route are not always the same shape. When your car can be done by a locksmith, a mobile visit is usually the more economical route, partly because there is no tow and no trip to a service department. When it cannot, we tell you early so you are not paying for a visit that leads nowhere. Whoever you call, ask what the quote covers before work starts.
- The vehicle: make, model and year decide which fob fits and how involved the pairing is
- The type of fob: a basic remote is a different job from a proximity smart key
- Whether you still have a working key: adding a fob with one in hand is generally simpler than starting from zero
- Whether a key blade needs cutting
- Whether the vehicle is a dealer-only case
- How many fobs you want programmed in one visit
- Where the car is and when you need us
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Why call Wilshire Lock & Key for a key fob?
Key fobs are one part of our wider automotive locksmith work. When you call (213) 577-1366, you reach us, not a call center that hands your job to whichever contractor picks it up.
- In business since 1987, long enough to have watched car keys go from brass blades to radio signals
- A real storefront at 10740 Wilshire Blvd in Westwood, plus mobile vans that do the work at your vehicle
- One company with no dispatch middlemen between your call and the technician
- David, our owner and lead technician, oversees the work
- Phone answered 24 hours a day, 7 days a week, year-round, as part of our 24-hour locksmith service
Key fob help across Santa Clarita: Valencia, Saugus, Canyon Country and Newhall
Santa Clarita is about 34 miles from our Westwood storefront, which is why the work happens where your car is. Our mobile locksmith vans cover Valencia, Saugus, Canyon Country, Newhall and Old Town Newhall, and every Santa Clarita ZIP code: 91321, 91350, 91351, 91354, 91355, 91387 and 91390.
Take the Valencia Town Center parking structures, where car lockouts are a familiar scenario. A fob that dies, cracks or goes missing in a multi-level garage is a stressful moment. If the fob is also locked inside, the job may be a car lockout first and a fob replacement second. We sort the door out, then the key.
In the tract neighborhoods of Saugus and Canyon Country, a fob job usually happens in a driveway or at the curb, which suits a van fine. HOA-managed communities are the norm across the city, so if your community has its own parking rules, mention them when you call and we will plan around them. On the larger ranch and equestrian properties in Sand Canyon and Placerita Canyon, the car may be a long way up a drive, so give us directions and tell us about any gate.
Summers here regularly pass 95°F, with wide swings between day and night. Heat is not kind to batteries or plastic cases, so a fob that has started acting flaky after a hot stretch is often worth a battery change before anything else.
Should I get a spare key fob before I lose the only one?
Yes, if you can. A spare key fob is a smaller job when a working key is still in your hand, and it usually costs less in money and hassle than replacing after every key is gone. Many drivers wait until they are down to one fob and then lose it.
Keep the spare at home, not in the car. If you are already booking a replacement, ask us about adding a spare in the same visit, since the equipment is already out.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How do I check a locksmith before they program my car?
California requires locksmith companies to hold a Locksmith Company (LCO) license from the Bureau of Security and Investigative Services (BSIS). Ask any locksmith for that license number before work begins and verify it with the state. This matters for fobs in particular, because the person you hire is setting up access to your vehicle.
Some near me listings forward to a dispatcher instead of a local shop, so ask who will actually come. Be cautious if the company will not give its name, the quote changes at the door, or nobody asks for proof that the car is yours.
Frequently asked questions
How much does key fob replacement cost in Santa Clarita?
It depends on the vehicle, the type of fob, whether you still have a working key, whether a blade must be cut, and whether the car is a dealer-only case. Call (213) 577-1366 with your year, make and model, and ask what the quote covers before work starts.
Do you come to me in Santa Clarita?
Yes. Our mobile vans bring the equipment to your car, whether it is in a driveway, a parking structure or on a ranch property. Our phone is answered 24 hours a day, 7 days a week. Our storefront is at 10740 Wilshire Blvd in Westwood if you would rather bring the car.
Can you replace a push-button start key?
For many vehicles, yes. We confirm by VIN which smart key your car takes and whether a locksmith can program it. Some are dealer-only, and we tell you that plainly instead of starting a job we cannot complete.
Is a locksmith or the dealer the more economical route for a fob?
When your vehicle can be handled by a locksmith, a mobile visit is usually the more economical route, since there is no tow and no trip to a service department. When it cannot, we tell you early. Get a clear quote from whoever you call.
My fob still works, but the buttons are worn. Replace it or fix it?
Start with a new battery, and look at whether the case is cracked or the buttons are rubbed through. If the electronics still work, a worn shell may be the only problem. If the fob fails intermittently after a fresh battery, replacement is usually the sounder choice.
Will my old fob still work after you program a new one?
It depends on the vehicle, so we confirm by VIN. Many drivers keep their existing fobs in use alongside the new one. If the old fob is lost, ask us whether it can be removed from the car's memory.
What should I have ready when I call?
Your vehicle's year, make and model, the VIN if you can read it from the dash or door jamb, how many working keys you have, and where the car is parked. You will also need ID and registration or title matching the vehicle.
Do I need a spare fob?
We recommend one. Adding a spare while you still have a working key is generally simpler than replacing after losing every key. Keep it at home, and ask us to add one during any replacement visit.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.