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Keyless Entry Systems For Your Truck Back in the 80's car theft with hot-wiring technology became more and more prevalent. To stop this, General Motors introduced transponder keys, also known as "chip keys". These new types of car keys have an electronic chip in the head of the key that sends a code to your car. If the code is found to match, the engine will begin. Transponder Keys Transponder keys have a microchip which transmits an electrical signal to the car's onboard computer once the key is put in the ig