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Keyless Entry Systems For Your Truck In the 1980s, car thefts using hot-wiring became more common. To combat this, General Motors introduced transponder keys, also known as "chip keys". The new car keys have an electronic chip within the head of the key that transmits an electronic code to your car. If the code is found to match, the engine will start. Transponder Keys Transponder keys come with an electronic chip that sends a signal to the car's computer onboard when the key is inser