Why car keys are more complicated than they look
A generation ago, a car key was a cut piece of metal, and a copy could be made at a hardware counter. Today most vehicles use some form of electronic key. A small chip inside the key head talks to the car's immobilizer, and the engine will not start unless the chip is recognized. Others use a fob that sends a signal, or a smart key that stays in a pocket while the driver pushes a button to start the engine.
This is good for theft protection, and it changes the practical meaning of a lost key. Cutting the metal is only part of the job. The new key often has to be programmed to the vehicle, which needs the right equipment, the right software for that make and model and, in some cases, specific information about the vehicle. That is why a lost key with no spare is a more involved problem than it used to be.
This page answers the questions drivers most often ask. It stays at the level of general information and does not describe how to defeat any vehicle's security system. It also reminds you that a locksmith will confirm who you are and that the vehicle is yours before doing key work, since a key is the most direct way to take a car.
The related pages on transponder key programming, lost car keys with all keys lost and smart key and push button start problems go into more depth on specific situations.
What documents a locksmith needs for car key work
This is the question that surprises people most. Before a locksmith cuts or programs a key, they will want to confirm that you are the owner or an authorized user of the vehicle. Expect to be asked for photo identification and for a document connecting you to the car.
The usual documents are the vehicle registration, the title or an insurance card in your name. The vehicle identification number, found on the dashboard near the windshield and on the door jamb, may be checked against them. If the name on the registration differs from yours, perhaps because the car belongs to a family member, a company or a leasing firm, additional proof of authority may be needed.
Documents locked in the car are a common problem. A photo of the registration on your phone, a digital insurance card or an email from a family member with a copy may help, though the technician decides what they can accept. The pages on vehicle ownership proof and locksmith authorization for vehicles explain the usual combinations.
The check may feel like an obstacle when you are stranded, but it is the reason a car key from a professional is trustworthy. A locksmith who made keys for any car on a spoken claim would be an enormous help to thieves. The FAQ on why ID comes before the work explains the thinking in more detail.
I lost my only key. What are my options?
A vehicle with no working key is called an all keys lost situation, and it is a common call. The usual options are a mobile locksmith who comes to the car, or having the vehicle towed to a dealer or a shop. Which of these makes sense depends on the vehicle, where it is and what the key needs.
A mobile locksmith may be able to cut and program a replacement at the location, which avoids a tow. This is not possible for every make and model, and some vehicles need specific information or equipment. The technician can tell you what is realistic once they know the year, make, model and the type of key. Quotes are given only by phone, and complicated jobs may need an on-site look before the full scope is known.
A dealer is another route for many vehicles, though it may involve towing, an appointment and waiting for a part. Which is more convenient depends on your situation. It can be useful to ask both about the process and the documents needed, since both will want proof of ownership.
Before calling, gather your vehicle's year, make and model, the vehicle identification number if you can get it, your identification and your registration or title. The page on lost car keys with all keys lost describes what typically happens. If your car is in an unsafe place, such as a roadside or a dark lot, put your safety first, and call 911 if you are in danger.
Key fobs, batteries and when a fob has really failed
Many fob problems are not what they seem. A fob that has stopped working is often a dead battery, and replacing it is a small job. Signs include a shorter range, a delayed response or a dashboard message about a low key battery. A car with a smart key often has an emergency way to start the engine even with a dead fob, described in the owner's manual.
If a new battery does not help, the fob may have lost its pairing, been damaged by water or a drop, or failed electronically. Salt air and humidity in coastal South Florida and trips to the beach or the pool can shorten the life of a fob. A damaged fob may need to be replaced and programmed, which is a job for a professional. The pages on key fob battery and replacement and a lost car key fob explain the steps.
A lost fob raises a security question, since someone else might use it. Depending on the vehicle, a locksmith or dealer may be able to remove the lost fob from the car's memory so it no longer works, though this is not possible on every model. Ask about it when you arrange a replacement.
Do not try to open a fob with force or buy unknown replacements from an unverified source online. A fob that is cloned, counterfeit or wrongly programmed can cause problems that are costly to untangle. If in doubt, ask a professional before spending money.
Transponder keys, programming and spares
A transponder key is a key with a chip in the head. The chip carries a code that the car checks before it will start. A copy that has the right shape but no programmed chip may open the door and turn in the ignition, but the engine will not run. This is what often surprises drivers who have a plain copy cut at a counter and find that it does not start the car.
Programming links the chip in the new key to the vehicle. The method varies by make and model. Some vehicles allow a limited form of programming when a working key is already available, while others need specialized equipment. This is why making a spare while you still have a working key is generally simpler than replacing a lost key later, and the page on spare car key making discusses it.
Older vehicles may use simpler keys, and the difference matters. The page on car key replacement for older vehicles describes the simpler cases, and car key replacement for newer vehicles describes the more involved ones.
If you have only one key, think about a spare now. A spare is typically less trouble than a replacement after a loss, and you avoid the stress of a stranded car. Keep the spare somewhere safe and not in the vehicle.
Broken keys, stuck keys and ignition problems
Not every key problem is a lost key. A key can break off in a door or in the ignition, a key can refuse to turn, and an ignition cylinder can wear until the car will not start reliably. These are mechanical problems and are different from the electronic ones, though they can overlap.
A key that breaks in the ignition or a door lock should not be dug at with improvised tools. Doing so can push the piece deeper or damage the cylinder. A professional can often remove a broken piece and make a new key from the code or from the remaining part. The pages on a broken car key and a key stuck in the ignition describe what is typically involved.
A steering wheel that locks and a key that will not turn is a feature of the steering lock, not a failure. Gentle movement of the wheel while turning the key often resolves it, as the page on a steering wheel that is locked and a key that will not turn explains. If that does not work, do not force it.
A worn ignition cylinder is common on older vehicles, and the page on worn or damaged ignition cylinders describes the symptoms. If your key has started to feel loose or sticky, address it before it fails completely.
Locked out of the car: safety first
A vehicle lockout is a different kind of urgency, and in South Florida the heat makes it more serious. If a child or a pet is inside a locked car, call 911 immediately. Heat inside a closed vehicle rises quickly, and emergency responders can enter without delay. Do not wait for a locksmith, and do not leave anyone in a closed car while you search for a solution. The guide on a child or pet locked in a car sets out the sequence.
For an ordinary lockout, where no one is in danger, a locksmith can usually help once identification and proof of vehicle ownership are shown. The location matters. A beach lot, a parking garage or an airport may have its own access rules, tickets or clearance heights, and the pages on car lockouts at the beach, in a parking garage and at the airport explain how these affect a call.
Never try to open the door with a coat hanger, a wedge or other improvised tools. Doing so can damage weatherstripping, the window, the wiring in the door or the airbag system, and it can trigger an alarm. This site never gives instructions for bypassing a vehicle lock, and the safest advice is to wait for a professional.
While you wait, stay somewhere safe, shaded and visible. Keep your phone charged and be ready to show your identification and registration or a digital copy of it.
Rental, company and leased vehicles
Not every vehicle belongs to the person driving it. A rental car belongs to the rental company, a company car belongs to the business and a leased vehicle belongs to the leasing firm. In these cases the driver may not have the authority to approve key work, and the technician will want to involve the owner.
For a rental, the first call is usually to the rental company's roadside number, which may arrange a replacement or send help. The page on rental car lockouts explains how this often goes. For company and fleet vehicles, the page on company car or fleet lockouts describes the authorization that a business typically provides.
Borrowed vehicles raise a similar question. A friend's car may be driven with permission, but the driver may not be able to show ownership. Say so on the phone, and ask what would be needed. Sometimes the owner can confirm by phone and provide a photo of the registration.
In every case, honesty about your situation helps the call. A dispatcher who knows the vehicle is a rental, a company car or a loan can tell you what to prepare rather than sending a technician who then has to leave without doing the work.
How the call goes and what to have ready
When you call about a vehicle key, expect to be asked for the year, make and model, the type of key, where the vehicle is and what has happened. You will also be asked who you are in relation to the vehicle. The dispatcher explains how quotes work and how the service call charge is handled before anyone is dispatched.
Quotes are given only by phone, and complicated key work may need an on-site look before the full scope is known. No arrival window is promised, because travel and workload vary, as explained in the FAQ on timing and arrival.
Have your identification, your registration or title and your insurance information ready, along with the vehicle identification number if you can reach it. If you have a spare key, say so. If the key is lost, say where and when, since a lost key may be a security question as well as a convenience.
If you are ready to talk it through, call and describe the vehicle and what has happened. The more clearly you describe it, the more clearly the dispatcher can tell you what the technician will need.
- Photo identification.
- Registration, title or insurance card showing your name.
- Year, make and model of the vehicle.
- Vehicle identification number if it is visible from outside.
- Whether you have any working key or fob.
- Exact location of the vehicle and any access rules there.
Questions people ask
Can a locksmith make a car key without the original?
Often yes, for many vehicles, once ownership is confirmed. Cutting and programming a key when none is available is called an all keys lost situation. Whether it can be done at your location depends on the make, model and key type. Quotes are given by phone, and complicated jobs may need an on-site look first.
What documents do I need to get a car key made?
Expect to show photo identification and a document that connects you to the vehicle, such as a registration, title or insurance card in your name. The vehicle identification number may be checked against it. If the car belongs to someone else or a company, additional proof of authority may be needed.
My key fob stopped working. Is it the battery?
Often yes. A short range or delayed response suggests a weak battery, which is a small fix. If a new battery does not help, the fob may have lost its pairing or been damaged by water or a drop. Your owner's manual may describe an emergency way to start the car.
Why won't a copied key start my car?
Many keys contain a chip that the car must recognize. A copy that fits the lock and turns the ignition but has no programmed chip will not start the engine. Programming links the chip to the vehicle. Making a spare while you still have a working key is usually simpler.
Should I try to open my locked car with a tool?
No. Improvised tools can damage the weatherstripping, window, door wiring and airbag components, and can trigger an alarm. If a child or pet is inside, call 911 immediately instead. Otherwise wait for a professional and stay somewhere safe and shaded.
What if the car is a rental or belongs to my employer?
Then the owner may need to be involved, since you may not have authority to approve key work. For a rental, start with the rental company's roadside number. For a company car, expect to show authorization from the business. Tell the dispatcher at the start so you know what to prepare.
Describe the situation by phone and we will tell you what the job involves. Quotes are given by phone. Jobs that cannot be quoted without seeing them need a technician on site, and the service call charge is explained on the phone before anyone is dispatched.