Transponder Key Programming in Kennett Square, PA

When your key turns but the engine will not start, the problem may be more than the cut of the metal.

A blinking security light or cranking without a start can point to a transponder problem, though either symptom can have other causes. In Kennett Square, we make and program transponder keys for vehicles that need them. A small chip inside the key sends a signal to the car's immobilizer, which must recognize it before the vehicle can start.

A copy cut to fit the ignition may turn it, yet still leave you unable to start the car if it has no chip or has not been paired with the vehicle. You may want a spare added to the car's memory, or you may need lost keys removed from that memory so they no longer authorize a start. We handle both kinds of programming in Kennett Square, using the options available for your vehicle. Removing a lost one from memory does not change the physical locks, so it may still turn them.

When you turn the key but the engine will not start, we first look at how the car responds.

We check whether the engine cranks, watch the security light, and check the key for damage and a compatible transponder chip. A copy may turn the ignition yet have no chip for the immobilizer to recognize. That is not the only possible cause of a starting problem, so we explain what our checks indicate and whether the trouble appears to be in the vehicle's security system or elsewhere.

Before programming, we explain your choices. You may want to add a working copy to the vehicle's memory or remove lost ones so they are no longer recognized. Removing lost copies can affect others too, and those may need to be paired again. We check the result with you by trying the available copies and watching the security light. If the engine still does not start, we explain what the check showed and whether another fault needs attention.

If the key casing cracks or gets wet, the chip inside may not work reliably.

Have a damaged shell replaced, and avoid attaching heavy objects that could strain it. Store a working spare somewhere secure, separate from the car. If one goes missing, we may be able to remove it from the car's memory, though its metal blade could still open a door.

Some cars flash the security light while parked as part of normal operation. If it keeps flashing while you try to start the engine, or the engine cranks but does not start, try your spare. A different result with the spare is useful information, but starting trouble can have other causes. Call us if the light keeps flashing during a start attempt or neither key works. We can check whether the car is recognizing them.