For the investigation of the controllability of one superposition steering system the driver and vehicle reaction in the event of a failure were examined in the past. With an increasing spreading of active steering systems in further vehicles it is to be known necessarily the influence of the changed vehicle parameters and actuator concepts on the controllability. This knowledge allows to transfer the results of the fail safe behavior on to other combinations of vehicles and actuator. For a broader investigation therefore four different vehicles were equipped with two different principles of superposition steering systems. The investigation was operated with the Interdisziplinären Zentrum für Verkehrswissenschaften (IZVW) of Universität Würzburg and by the order of several vehicle manufacturers examined. In the context of this article the analysis of the vehicle reaction in the event of a failure is reported. The investigation shows that reversible steering failures are less critical than irreversible steering failures. The maximum steering angle in the case of a reversible error with latency time of 50 ms is limited to approximately 1 deg. Reversible errors with latency of 200 ms hardly differ from the irreversible errors with respect to the maximum steering angle. The vehicle disturbance is in the case of reversible errors with latency of 200 ms smaller than those in the case of irreversible errors by maximum nominal steering angle. From this it is possibility to reduce the disturbance of the vehicle motion even if the exposure time to the steering error of up to 200 ms. Focusing maximum steering angle in consequence of an error a (velocity dependent) ratio between the maximum steering angle of the wheel and the nominal steering angle exist. The tested vehicles represent a broad range of vehicle characteristics. The expected spread on vehicle disturbance as a consequence of a steering error could not be observed when the testing velocity was less than the characteristic velocity for the test vehicle. These results are valid for the maximum yaw rate as well as the maximum lateral acceleration. Dependent on the superposition steering concept used, different supporting torqueses were measured. Systems which use a Harmonic-Drive gear the drive have to support a higher steering wheel torque compared to systems equipped with a planetary gearbox.