Older car keys were plain pieces of cut metal. Modern vehicles add an electronic layer: a small transponder chip in the key head that the car must recognise before the engine will run. It is a big step forward in theft prevention, but it means replacing a key takes more than cutting.
What is a transponder chip key?
The chip has no battery. When you turn the key, a coil around the ignition powers the chip, which answers with a code. If the car's immobiliser recognises the code, the engine starts. If not, the car may crank but won't run.
Signs your chip key is failing
- The engine cranks but doesn't start
- A key or security light flashes on the dashboard
- The car starts with your spare but not your main key
- The key has been dropped, soaked or cracked
What to do if the chip isn't working
- Try your spare key. If it works, the problem is likely the main key.
- Check the key head for cracks; the chip may be loose or missing.
- Don't keep cranking the engine repeatedly.
- Call an automotive locksmith with your year, make and model.
How a replacement is made
The locksmith cuts the blade to match your locks, then uses programming equipment to pair the new chip with your car. For some vehicles we will need proof of ownership and your VIN. Many replacements can be done where the car is parked.
Need a chip key?
Our automotive locksmiths cut and program transponder keys across Alhambra. Call 626-537-3964 to check whether we can do yours.
