New Key Starts the Car but the Buttons Don't Work: Arlington TX
Why a new key starts the car but the buttons don't work
As of October 2026, a new key that starts the engine but will not lock or unlock comes down to one of seven causes, and in Arlington the fix usually costs $80 to $220 if the key is the right part. The reason is simple once you see it: starting the engine and working the locks are two separate registrations. The chip is entered in the immobiliser. The buttons are entered in a different module. A key can be accepted by the first and never be introduced to the second. Call or text (817) 646-7134 with the make, model and year and we will tell you which cause it sounds like.
This is one of the most common calls we get after a key was made somewhere else, and it is nearly always fixable without buying another key.
One key, two separate systems
A modern key does two unrelated jobs.
It proves it is allowed to start the engine. A transponder chip in the key is read at very short range, a few centimetres, by an antenna around the ignition or behind the start button. The chip needs no battery. The immobiliser checks it against a list of keys it trusts.
It sends radio commands for the locks. A battery-powered transmitter behind the buttons sends lock, unlock and trunk commands over a much longer distance. A separate receiver in the car listens for them and checks them against its own list of remotes.
Two lists, two modules, two procedures. That is why the fault you are seeing is possible at all, and it is why the reverse fault exists too, a fob that locks the doors and will not start the car.
| What you see | What it tells you | Most likely cause |
|---|---|---|
| Starts, buttons dead, old fob still works | The car is healthy | Remote not paired, or wrong part |
| Starts, buttons dead, no light on the fob | No power at the transmitter | Battery dead, missing or tab left in |
| Starts, buttons dead, light on the fob works | Fob transmits, car is not listening | Wrong frequency, or remote not paired |
| Starts, key has no buttons that click | No remote board in the key | Chip-only key or empty shell |
| Push-button car starts only with fob held to the button | Backup start path in use | Fob battery or transmitter side failed |
| Starts, buttons dead on every fob you own | The car side has a fault | Receiver, fuse or module |
| Lock works, trunk or remote start does not | Remote is paired | Button not supported on your trim |
The seven causes, in the order to check them
1. The battery, or the plastic tab
New fobs often ship with a clear plastic tab under the coin cell so the battery does not drain in storage. If nobody pulled it, the transmitter has no power. The engine still starts, because the chip needs no battery.
Press a button and watch for the small light on the fob. No light means no power. Open the case, check for a tab, check the cell is the right way up and is the size printed inside the housing. If your dash is also showing a warning, our guide to a key fob battery low warning that will not go away covers the battery side in detail.
2. The remote was never paired
This is the most common cause when the key came from a hardware store kiosk, an online seller or a shop that does keys as a sideline.
The chip was programmed, the car started, the job looked finished, and the key was handed over. The second procedure, pairing the remote with the receiver, was skipped or was not something that shop could do. Nothing is broken. The remote side simply has not been done.
The clue is that your original fob still works perfectly and the new one does everything except the buttons.
3. The fob is the wrong frequency
Manufacturers build the same fob shell with different transmitters for different markets, model years and trims. Two fobs can look identical and carry the same chip, and transmit on different frequencies.
Program the wrong one and the engine starts, because the chip is right. The buttons never work, because the car is not listening where the fob is talking. No amount of reprogramming changes that.
The frequency and part number are printed inside the case or on the back. They have to match the original, not just the shape. Our online key fob programming cost guide shows how to check a part before buying it.
4. The key has no remote in it
Some keys are sold as a blade and a chip in a shell with buttons moulded into the plastic and nothing behind them. They are cheap, they start the car, and they are honestly described in the small print as transponder keys.
If the buttons on your new key do not click, or the head feels hollow and lighter than the original, there may be no remote board inside. That key will never lock the doors. It is still a perfectly good emergency spare. The transponder versus smart key guide explains the difference between a chip key and a remote key.
5. The fob was used on another car
A used fob still carries the identity of the vehicle it came from. On some makes the remote side can be paired to a new car without trouble. On others the fob locks to its first vehicle and will not pair again until it is reset with specialist equipment, and some cannot be reset at all.
A used fob that starts your car has had its chip side handled. Whether its remote side can ever be paired depends on the make. Tell us the part number and where it came from, and we can usually say before a visit.
6. The vehicle's remote memory is full or was cleared
Vehicles store a limited number of remotes. When the list is full, a new one is not accepted until the list is cleared.
The related trap runs the other way. On many vehicles, entering remote learning mode erases every stored remote, and each one has to be paired again in the same session. If one fob was programmed and the others were not in the car at the time, the others stop working. If your original fob stopped at the same moment the new key arrived, this is what happened, and our guide to one key fob that stopped working while the other still works covers the pattern.
7. The car is not hearing any remote
If no fob works, old or new, the fault is in the car. A blown fuse, a failed receiver, a damaged antenna, or a module that has lost its settings.
Two things cause this more often than hardware failure. A recent 12-volt battery change, covered in our guide to a key fob not working after a car battery replacement. And an aftermarket alarm or remote start that sits between the remote receiver and the locks, covered in our guide to an aftermarket alarm blocking key programming.
Note: Before any remote is paired, gather every key and fob you own. On many vehicles the pairing session clears the stored remotes and rebuilds the list from whatever is in the car at that moment. A fob left in a kitchen drawer can stop working the same afternoon.
The push-button version of this problem
On a proximity car the symptom looks slightly different, and it confuses people.
The fob will not unlock the doors by touch, the buttons do nothing, and the dash says no key detected. But hold the fob against the start button, or drop it in the backup slot in the console, and the engine starts.
That is the backup path. It reads the fob at very short range without using the fob's own radio, in the same way a transponder key is read. So the car can start with a fob whose transmitter side is completely dead.
If your new proximity fob only works that way, the fob's battery is flat, its transmitter has failed, or it is the wrong part for the vehicle. The backup path is meant to get you home, not to be how you start the car every morning. Our guide to starting a car with a dead key fob battery explains where the backup position is on common makes, and the smart key not working diagnostic guide covers the wider fault.
Checks to run before calling
- Press a button and look for the light. No light is a battery or tab problem.
- Try your original fob. If it works, the car is fine and the fault is in the new key.
- Compare the two fobs. Same button count, same part number, same frequency marking inside the case.
- Feel the buttons. A real remote has buttons that click. A hollow shell does not.
- Check the owner's manual. Some older vehicles have a remote pairing procedure the owner can run. If the manual describes one, try it once, with every fob present.
- Recall what changed. A battery swap, an alarm fitted, a key made last week. The timing usually names the cause.
What the fix costs in Arlington
These are the service bands this site publishes for 2026. All of it is done at your vehicle.
| Situation | Fix | Cost in Arlington | Typical time |
|---|---|---|---|
| Battery or shipping tab | New coin cell, tab removed | Cost of a cell | Minutes |
| Right key, remote never paired | Remote paired to the vehicle | $80 - $220 | 20 - 40 min |
| Wrong frequency or part number | Correct remote head key, cut and programmed | $140 - $280 | 30 - 45 min |
| Wrong or failed proximity fob | Correct smart key supplied and programmed | $220 - $550 | 45 - 90 min |
| Chip-only key, remote wanted | Remote head key or separate remote added | $140 - $280 | 30 - 45 min |
The first two rows are the key fob programming band, the middle rows are the transponder key programming band, and the proximity row is the smart key programming band. Fobs for European makes sit in their own higher band, which the European car key cost guide covers.
The honest summary is this. If the key is the right part, you are paying for a short programming visit, not for another key. If it is the wrong part, no visit can fix it, and the cheapest route is a correct key made once.
How to avoid this when ordering a key
Ask what "programmed" includes. A complete job is cut, chip, remote, and a test of all three. If a quote covers only the chip, you are buying a key that starts the car and nothing more.
Match the part number, not the picture. Online listings are sorted by photo. Vehicles are not.
Be wary of a fob that is far cheaper than the rest. The usual reasons are a missing remote board, a used fob, or the wrong frequency. The FTC guidance on auto repair makes the general point well: get the scope of work in writing before you pay.
Use someone accountable. A key that starts a vehicle is a security credential. The NASTF Vehicle Security Professional programme is the industry framework for access to vehicle security data, and in Texas the locksmith doing this work operates under the Texas DPS Private Security Program.
What happens on an Arlington visit
- Quote. Tell us the make, model and year, whether the original fob still works, and where the new key came from.
- Verify. Photo ID matched to the registration or title before any key work.
- Identify the key. We read the chip and check the remote's frequency and part number. That tells you in the first few minutes whether the key in your hand can be made to work.
- Pair or replace. If it is the right part, the remote is paired, along with every other fob you own. If it is not, we show you why and quote the correct key.
- Test. Start, lock, unlock, trunk, and each fob in turn.
We cover North Arlington, South Arlington, the Entertainment District, and Dalworthington Gardens and Pantego.
Frequently Asked Questions
Why does my new key start the car but the buttons don't work?
Because starting the engine and working the locks are two separate registrations. The chip in the key is registered with the immobiliser, and the remote buttons are registered with a different module. A key can pass the first and never be entered in the second. The other common causes are a key with no remote board, the wrong remote frequency, and a dead or protected battery.
Does programming a key also program the remote buttons?
Not always. On many vehicles they are two different procedures, sometimes done with different steps on the same equipment. A complete job does both and tests both. If only the engine-start side was done, the car will run and the buttons will do nothing until the remote is paired as well.
Can a key fob be the wrong frequency and still start the car?
Yes. The chip that starts the engine works at very short range and is separate from the radio transmitter behind the buttons. Two fobs can look identical, carry the same chip, and transmit on different frequencies. The wrong one will start the engine when programmed and will never lock or unlock the doors, because the car is not listening on that frequency.
My push-button car starts when I hold the fob to the button but nothing else works. Why?
That is the backup start path. A proximity fob held against the start button or placed in its backup slot is read at close range without using the fob's own radio. If the car starts that way but the buttons and touch-to-unlock are dead, the fob's battery or its transmitter side has failed, or the fob is the wrong part for the vehicle.
How much does it cost to program the remote buttons on a key in Arlington TX?
As of October 2026, programming a key or fob you already own runs $80 to $220 in Arlington, and pairing the remote side is usually at the low end of that band. If the key turns out to be the wrong part, a correct remote head key cut and programmed runs $140 to $280, and a proximity fob runs $220 to $550.
Can I program the remote buttons myself?
On some older vehicles, yes. The owner's manual may describe a sequence of ignition turns or door-lock presses that puts the car into remote learning mode. On most newer vehicles that route was removed, and the remote has to be paired with equipment. If your manual has no such procedure, the car does not support it.
The old fob still works but the new one doesn't. What does that mean?
It means the car is healthy. The receiver, the door locks and the module are all doing their job, so the fault is in the new key or in how it was programmed. That narrows it to four causes, the remote was never paired, the fob is the wrong frequency or part number, the fob has no remote board, or its battery is dead.
Will pairing a new remote erase my other fobs?
On many vehicles, yes. Putting the car into remote learning mode clears the stored remotes, and every fob you want to keep has to be paired again in the same session. Bring every key and fob you own to the appointment. A remote left at home can stop working when it was fine the day before.
New key starts the car but won't lock it? Here is how to reach us
Tell us the make, model and year, whether your original fob still works, and where the new key came from, then call or text (817) 646-7134. If the key in your hand can be made to work, we will say so before quoting a new one. Car keys only, mobile, no dealer appointment.
Related pages
Need a car key in Arlington right now?
VIN-based flat-rate quote before we dispatch. NASTF VSP registered.
Call · (817) 646-7134