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Keyless Entry Systems For Your Truck In the 1980s, car burglaries using hot-wiring were becoming more common. General Motors introduced "chip keys" or transponder keys in order to stop this. The new car keys have an electronic chip in the head that transmits a unique number to your vehicle. If the code matches, your car's engine will start. Transponder Keys Transponder keys have a microchip which transmits a signal to the car's computer onboard when the key is placed in the ignition. The computer on board of the vehicle checks the code, and