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Keyless Entry Systems For Your Truck In the 1980s, car thefts utilizing hot-wiring were becoming more common. General Motors introduced "chip keys" or transponder keys in order to stop this. These new car keys contain an electronic chip in the head which transmits a unique code to your vehicle. If the code matches, your engine will begin. Transponder Keys Transponder keys are equipped with an embedded microchip that transmits an electrical signal to the car's onboard computer when the key is put i