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Keyless Entry Systems For Your Truck In the 1980s, car thefts using hot-wiring became more frequent. General Motors introduced "chip keys" or transponder keys to combat this. The new keys for cars have an electronic chip in the head of the key, which transmits a code to your car. If the code matches your car's engine, it will start. Transponder Keys A transponder key is equipped with an embedded microchip that sends