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Keyless Entry Systems For Your Truck In the 80's, car theft using hot-wiring technology was becoming increasingly common. General Motors introduced "chip keys" or transponder keys to stop this. These new types of car keys feature an electronic chip inside the head of the key that sends the car with a specific code. If the code matches, your car's engine will start. Transponder Keys Transponder keys have a microchip which transmits an electronic signal to the car's onboard computer