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Keyless Entry Systems For Your Truck In the 1980s, car thefts using hot-wiring became more frequent. To combat this, General Motors introduced transponder keys or "chip keys". These new car keys contain an electronic chip in the head that transmits a unique code to your vehicle. If the code matches, your engine will begin. Transponder Keys Transponder keys come with an embedded microchip that transmits a signal to the car's onboard computer once the key is placed in the ignition. The onboard computer of the c