Transponder Key Programming
Chip key cutting & programming for all major makes — a Seatown specialty since 2007. Save hundreds vs. the dealership.
WHICH KIND OF KEY DO YOU HAVE?
A lot of calls start with someone describing their key wrong, which sends the whole conversation sideways. Here is how to identify yours before you pick up the phone.
| Era |
What it looks like |
What is inside |
What it means for you |
| Before ~1995 |
Plain metal blade, thin or no plastic head |
Nothing — purely mechanical |
Any locksmith can copy it in minutes. The cheapest key we cut. |
| ~1995–2005 |
Thick black plastic head, no buttons |
Fixed-code transponder chip |
Has to be programmed to your car. A hardware-store copy will turn the lock and crank the engine, then stall. |
| GM, ~1986–2005 |
Blade with a small black pellet set into it |
A resistor (VATS), not a chip |
The car reads a resistance value, not a code. Different technology, different fix — and routinely mistaken for a chip key. |
| ~2000–2015 |
Plastic head with lock/unlock buttons |
Rolling-code transponder plus a remote |
Cutting and programming are two separate jobs. Both have to work or you are still stuck. |
| ~2005–today |
Fob in your pocket, push-button start |
Proximity key, encrypted rolling code |
Usually no blade to cut — it is nearly all programming. The most expensive to replace, and still well under dealer pricing. |
Everything from roughly 1995 on talks to an immobilizer: a module that will not let the engine run unless it hears the right coded answer from the key. That is why a key that fits perfectly can still leave you sitting in a parking lot. The lock is mechanical. The permission is electronic.
HOW WE PROGRAM A KEY — AND WHERE THAT STOPS
Nearly all modern key programming happens through the OBD-II port under your dash — the same connector a mechanic uses to pull engine codes. We plug in, authenticate with the vehicle, add the new key to the immobilizer’s list of accepted keys, and the car accepts it. On a cooperative vehicle that takes minutes.
That covers the overwhelming majority of what is on the road here: domestic makes, mainstream imports, remote head keys, and most push-to-start systems.
What it does not cover is any vehicle that requires manufacturer software to authorise a new key. Some makes will not let anyone but the dealer add a key once all of them are lost, because the security data sits behind a login we do not have. We do not pull and bench-read immobilizer modules. Some shops do. We do not, and we would rather say so on a web page than discover it in your driveway.
On price: programming runs $80–$250 depending on the vehicle and the key type. That figure is the programming portion only — the key or fob itself is priced separately, because a basic transponder blade and a proximity fob are nowhere near the same part. We quote the whole thing, parts and programming together, before we come out.
LOST ALL KEYS: WHAT ACTUALLY HAPPENS
No spare to copy changes the job completely. Here is the sequence, so none of it is a surprise:
- We confirm the car is yours. Photo ID matching the registration or title, plus the VIN. This is firm, and you should be suspicious of anyone who skips it.
- We originate the key. With nothing to duplicate, the cuts come from the VIN or from reading the lock cylinder itself.
- We cut it. On a proximity key there is often nothing to cut, and the whole job is the next step.
- We program it to the immobilizer through the OBD port.
- Some cars impose a security wait — typically 10 to 30 minutes where the vehicle refuses to accept a new key at all. That is the manufacturer’s timer, not ours, and nobody can shortcut it.
- We test everything before we leave — ignition, every door, the trunk, and the remote functions.
Have ready when you call: year, make, model and trim; the VIN; your registration or title; and photo ID. That is the difference between a quote on the phone and a guess.
WHAT WE TURN AWAY — AND WHY WE TELL YOU FIRST
We would rather tell you no on the phone than bill you for a truck roll that ends in an apology. Two categories we send elsewhere:
- Mechanical faults that look like key problems. The most common is a key that will not come out of the ignition. That is usually not the key at all — frequently it is a faulty neutral safety switch or a shifter interlock telling the ignition it is not allowed to release. Cutting you a new key fixes nothing. That is a mechanic’s job and we will say so.
- Most Mercedes and BMW models that require dealer software. On those vehicles the key authorisation lives behind manufacturer software we do not currently have. Call us anyway with the year and model — but expect us to tell you it is a dealer job, and to tell you before you have paid anybody a service call.
Everything else, call with your year, make and model and we will tell you straight which category you are in before anyone gets in a van.
