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Keyless Entry Systems For Your Truck In the 1980s, car thefts utilizing hot-wiring became more common. To combat this, General Motors introduced transponder keys or "chip keys". These new types of keys for cars have an electronic chip within the head of the key that sends a code to your car. If the code matches your car's engine will start. Transponder Keys A transponder key has an embedded microchip that sends an indication when the key is put into the ignition. The car's onboard computer then exam