Trig modulation electrostatic discharge protection devices are presented. A first variable, which characterizes the mass flow of the gas conducted through the EGR channel, is ascertained from a set of state variables of the internal combustion engine, which apply for an operating state in which the engine is in overrun operation and the final control element is essentially closed. The deflector member is further adapted to extend distally from the first wall to the second wall relative to the vehicle frame, and away from a centerline of the vehicle frame. The method further comprises preventing the GFCI from tripping in response to out of phase conditions less than the maximum out of phase conditions. A resistance of the variable resistor is switchable.