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Types of Truck Keys Knowing the type of key you have makes it easier to get an alternative. Here's a look at the various types of keys and their characteristics. This key looks like any other key, but it is equipped with an electronic chip to prevent car theft. The chip communicates with the vehicle to start the vehicle. Transponder Keys A transponder key that is normal in appearance like a regular metal key, however it has a plastic top which houses the transponder. GM's Circle Plus and PK3 keys are two examples of key. These are the