A vehicle (1) security system and method that comprises at least one controlled magnetic field sensor (10) connected to at least one antenna (11); where this antenna (11) is configured like a single electrode, in such a way that the controlled field sensor (10) measures the disturbances of the electrostatic field around the antenna (11); and where the controlled electrostatic fields (10) is configured to detect a disturbance in the electrostatic field (3), created by its own antenna (11); and where at least one antenna (11) is in a position between an area external to the vehicle (1); an area internal to the vehicle (1); and a parking area and where each sensor (10) is connected to a control device (100).