Well, there are two possible solutions that you can take.
As mentioned previously, there are two types of GPS tracking devices. There are one that is battery powered and other GPS tracking devices that do require to be hardwired.
So, if you find a hidden tracker, and it is in the first category, that is to say, a battery-powered GPS, then the removing process will be easy.
These devices are most commonly held on by tape or magnets. Thereupon, once you detect one, then all you should do is to pull it loose.
On the other hand, if you find a hidden tracker in your vehicle, and it is hardwired, then you should make sure that you are careful when removing it. Most commonly I would recommend you to call a mechanic.
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Other Common Places Where You Can Find a Hidden GPS Tracker
In the light of discovering other places where you can find a hidden GPS tracker, I must as well mention a crucial fact.