What is a transponder key, and why won't a plain copy start the car?
A transponder key looks like an ordinary car key, but the plastic head holds a small chip. When you turn the key or press the start button, the car's immobilizer sends a low-power signal to that chip and waits for the right answer. If the chip answers correctly, the engine is allowed to run. If it doesn't, the car may crank and then die, or it may not crank at all.
That is why a key cut at a hardware counter often opens the door and still won't start the car. The metal blade matches the lock, but nothing inside the head has been introduced to your vehicle's computer. Programming is the step that makes the car recognize the key as one of its own.
Most vehicles built from the late 1990s onward use some form of this system. The details differ by make, model and year, and we don't guess at them. We confirm what your specific vehicle needs by VIN or in person before we promise anything. This page explains how the work goes, so you know what to expect when you call.
What happens when a chip key goes missing in Irwindale?
Irwindale is a small city with a lot of through traffic. People come in for work at the plants and warehouses, to park at the Irwindale A Line station and ride out, or to spend a day at the Santa Fe Dam Recreation Area. A key that falls out of a pocket, gets left on a picnic table or goes missing between shifts is a common way to end up stranded here. The car is fine and the door may even be open, but the vehicle won't start without a recognized chip.
Most people who call us are in one of two situations. The first is that they have lost their only key. That is the harder case, because the car has no working key to learn from, and the process usually takes more equipment and care. The second is that they still have one working key and want a spare before the problem gets worse. That is the easier, calmer job, and usually the more economical route.
If you're locked out and the key is inside, that's a different problem. Start with car lockout service in Irwindale and we'll get you in first, then talk about whether a spare makes sense.
How do we program a transponder key, step by step?
The exact tools vary by vehicle, but the sequence is consistent. Here is what you can expect when we come out to you in a van.
- You call (213) 577-1366 and tell us the make, model and year, and whether you have a working key. We'll ask for the VIN if you can read it from the dash or door jamb. That lets us confirm what your vehicle needs before we drive out.
- We tell you plainly whether your vehicle can be handled by a mobile locksmith or whether it falls into a dealer-only situation. If it's dealer-only, we say so on the phone rather than after you've waited.
- On arrival, we confirm you're the owner or authorized driver. We'll ask for ID and something that ties you to the vehicle, such as registration. This protects you as much as it protects us.
- We cut the key blade to fit the locks and ignition. If you still have a key, we can often work from it. If you've lost every key, we cut by code or by other methods suited to that vehicle.
- We connect our programming equipment to the vehicle and add the new key to the immobilizer. On some vehicles, that is a quick procedure. On others, it takes security access steps and more time.
- We test everything before we leave. The key has to turn the ignition or start the vehicle, open the doors, and work any remote functions on the head if it has them. If you have a key you want to retire, ask us about removing a lost key from the system so it can't start the car.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Duplicate transponder key or full replacement: which one do you need?
These two jobs use the same technology but are different situations, and it helps to know which one you're in.
A duplicate transponder key is made while you still have a working key. The car already trusts one key, so adding another is generally the simpler procedure. If you've been carrying one key and have been meaning to get a spare, this is the time. Waiting until the last key is lost turns a routine job into a harder one.
Transponder key replacement is what you need when the key has been lost, stolen or broken beyond use. Chip key replacement with no working key to copy from usually takes more preparation and more steps. It can also depend more heavily on the vehicle itself.
A few quick ways to sort yourself out:
- You have one working key and want another: that's a duplicate.
- You have a key that opens the doors but won't start the car: the chip may have failed or was never programmed, which is a replacement or reprogramming job.
- You have no keys at all: that's an all-keys-lost replacement. See our page on lost car key replacement for the full picture of that situation.
- Your key has remote buttons that no longer work: that may be a remote or battery problem rather than a chip problem. Our key fob replacement page covers that.
What affects the cost of car key programming?
We don't quote numbers on a web page, because honest pricing depends on facts we don't have until we know your vehicle. Here is what moves the cost up or down, so there are no surprises when you call.
The biggest factor is the vehicle itself. Make, model and year decide what kind of key and chip it uses, how it is cut, and what equipment is needed to program it. Some are straightforward. Others require more steps or specialized access.
The second factor is whether you have a working key. Adding a key to a car that already recognizes one is usually the lighter-cost option compared with starting from nothing.
Other factors include the type of key itself. A basic chip key, a key with built-in remote buttons, and a push-button-start smart key are not the same product, and they don't cost the same to supply and program. Location and time of day matter too, since a van has to reach you. Irwindale is about 32 miles from our Westwood base, and we count that in our planning, not as a surprise add-on.
Whatever the job, we tell you the full cost before we start work. If you're comparing quotes, ask each company whether the number covers the key, the cutting, the programming and the trip, so you're comparing the same thing.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366When is a dealer the honest answer?
We would rather tell you the truth than take a job we can't finish. Some vehicles are dealer-only for key programming, or are dealer-only for certain situations such as all-keys-lost. Sometimes the manufacturer restricts access to the programming data. Sometimes the equipment or security access just isn't available outside the dealer.
We don't have a master list that we'd trust enough to recite on a web page, since this changes by model and year and the information is not always consistent. So we confirm by VIN or in person. If your vehicle turns out to be dealer-only, we'll tell you directly and explain what the dealer will likely need from you. You may be able to have the vehicle towed there or have us help in other ways, such as cutting or making a spare once the system is working.
That honesty costs us a job now and then. It also means that when we do say we can handle your car, you can rely on it.
Why call Wilshire Lock & Key for transponder keys?
There are plenty of ways to get a chip key made. Here is what we offer, and nothing more than that.
- We've been in business since 1987. Vehicle security has changed a great deal in that time, and we have worked through all of it.
- We have a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans. The shop handles bench work, and the vans bring the equipment to you.
- You deal with one company. There's no call center passing your job to an unknown subcontractor. The person who answers the phone is part of the team that does the work.
- David, the owner and lead technician, oversees the work. If a vehicle is unusual, he is the one who decides how we proceed.
- We answer the phone 24 hours a day, 7 days a week, all year at (213) 577-1366.
- We serve 140 cities across Los Angeles and Ventura counties, so Irwindale is part of our regular service area. See all of them on our locations page.
Where do Irwindale drivers run into transponder key problems?
Irwindale doesn't look like most cities our size. Fewer than 2,000 people live here, in a few small enclaves of modest single-family homes, mostly early-to-mid 20th century, clustered near the Civic Center along Arrow Highway. The rest of the land is gravel quarries, warehouses and manufacturing plants. That affects where key calls come from, and a few places stand out.
The Irwindale A Line park-and-ride is one. People leave a car there all day and take the train. If you come back to find the key gone from your pocket or bag, you are stuck at the station with a vehicle that won't start without a recognized chip. Car key replacement at the park-and-ride is something we plan for, and a van can come to you in the lot. ZIP 91706 covers much of that area, and we serve 91702 as well.
The Arrow Highway corridor and the Irwindale Avenue corridor carry the daily commute for people who work at the plants and warehouses nearby, so a lost key during a shift is a realistic problem. The Live Oak Avenue industrial district is similar. If a work vehicle belongs to a company, we'll want to confirm who is authorized to have a key made, which is a simple check, and we can add a spare so the next lost key isn't a stopped truck.
Around the Santa Fe Dam area, cars sit in parking lots while their owners are out walking or at the recreation area. Keys get misplaced there. If your key is gone and the car is locked, we'll start with the lockout and then handle the key.
For the homes near the Civic Center, a spare chip key kept in the house, not in the car, is a cheap bit of planning that avoids a bad day. If you are also thinking about your door locks, see our Irwindale residential locksmith page.
Hot inland-valley summers are hard on anything left in a parked car, and a spare key stashed in the vehicle is the first thing you lose when the car is the problem. Keep the spare somewhere separate.
For broader coverage of the city, see our Irwindale locksmith overview and our automotive locksmith services.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What should you ask any locksmith before they program a key?
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), known as an LCO license. You should ask any locksmith for their license number before work begins, whether it's us or someone else. A legitimate company will give it to you without hesitation.
A few more questions are worth asking. Will they confirm your vehicle by VIN before they come out? Will they give you the full cost up front? Do they ask you to prove ownership? A company that skips that last one is a company that would make a key for anyone.
If you're stranded and uncertain, call us on (213) 577-1366 and ask questions. We'd rather answer before you commit. If you'd rather reach us another way, our contact page has the details.
Frequently asked questions
Can you program a transponder key if I've lost all my keys?
In many cases, yes, but it depends on the vehicle. All-keys-lost jobs take more steps than adding a spare, and some vehicles are dealer-only in that situation. We confirm by VIN or in person and tell you honestly which way yours goes before any work starts.
Do you come to me in Irwindale, or do I have to bring the car in?
We come to you. Our mobile vans carry the cutting and programming equipment, so we can work at your home, workplace, the A Line park-and-ride or another lot. If a vehicle needs bench work or the dealer, we'll say so on the call.
What's the difference between a duplicate transponder key and a replacement?
A duplicate is made while you still have a working key, so the car already recognizes one key and we add another. A replacement is for when every key is lost or the existing key no longer works. Duplicates are usually simpler and more economical.
Will a key cut at a hardware store start my car?
Usually not if the car has an immobilizer. A plain cut key may turn in the lock, but the chip in the head must be programmed to your vehicle for the engine to run. A cut-only key can open the door and still not start the car.
How much does transponder key programming cost?
It depends on your vehicle, the type of key, whether you have a working key to copy, and where we're coming to. We don't post numbers because they'd be guesses. Call (213) 577-1366 with your make, model and year, and we'll explain the cost before we start.
Do I need to prove the car is mine?
Yes. We ask for ID and something that connects you to the vehicle, such as registration. This is standard practice for a legitimate locksmith, and it protects you from someone else making a key to your car.
Can you fix a key that opens the doors but won't start the car?
Often it's a chip that was never programmed, has failed, or has lost its pairing. We can check which it is and tell you whether reprogramming or a new key makes sense. If the problem is the ignition itself, our ignition repair page covers that.
Is the locksmith you send licensed?
California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith for it before work starts. Ask us as well. Our license number is being added to this site, and you're entitled to ask for it when you call.
What if my vehicle is dealer-only for key programming?
We'll tell you on the phone, not after you've waited. Some vehicles or situations can only be handled by the dealer. If yours is one of them, we explain what the dealer will need and where we can still help, such as with a lockout or a spare once the system is working.
More locksmith help in Irwindale
Transponder Key Programming near Irwindale
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.
