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Types of Truck Keys Knowing which kind of key you have makes it easier to find an alternative. Here are the different types of keys along with their functions. The type of key appears like a standard key but it has an electronic chip that can prevent car theft. This chip is used to initiate the vehicle. Transponder Keys Transponder keys are similar to keys made of metal, but they have a plastic cap that houses the transponder. This type of key is found on GM's Circle Plus keys and PK3s. These are the keys most people use in their automobiles.