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Keyless Entry Systems For Your Truck In the 1980s, car thefts utilizing hot-wiring were becoming more common. To stop this, General Motors introduced transponder keys or "chip keys". These new car keys contain an electronic chip in the head which transmits a unique code to your vehicle. If the code is matched, your car will start. Transponder Keys Transponder keys have an embedded microchip that transmits an electronic signal to the car's onboard computer when the key is put in the ignition. The onboard computer of the car verifies the code, and permits the engin