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Types of Truck Keys Finding a replacement key is much easier if you know what type of key it is. Here's a look at the various kinds of keys and the features. The key is similar to any other key, however it has an electronic chip to prevent car theft. The chip communicates with vehicle to start it. Transponder Keys A transponder key that is normal in appearance like a regular metal key, but it has a an aluminum top that houses the transponder. GM's Circle Plus and PK3 keys are examples of this type of key.