No, the Jeep Grand Cherokee does *not* use a traditional "security key" in the sense of a separate key fob needed *in addition* to a key to start the car. The key fob itself contains the transponder chip that communicates with the vehicle's immobilizer system. You need the key fob to start it; there isn't a separate, physical key to insert.
However, some older models may have a backup key option. But this is not the standard or primary starting method. The vast majority of modern Jeep Grand Cherokees rely solely on the key fob's transponder chip to authorize starting.
