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Keyless Entry Systems For Your Truck In the 1980s, car thefts using hot-wiring were becoming more common. General Motors introduced "chip keys" or transponder keys to combat this. The new car keys include an electronic chip in the head that transmits a unique number to your vehicle. If the code is found to match, the engine will start. Transponder Keys A transponder key has the microchip that transmits a signal when the key is put into the ignition. The car's onboard computer examines the code and allows the engine to start in the event that