The invention relates to a steer-by-wire steering system (1) for a motor vehicle, comprising: - A steering handle (2) which can be actuated by a driver; - A vehicle wheel actuator (11), which is set up to set a wheel steering angle of at least one steerable wheel of the vehicle; - A reaction force actuator (5) connected to the steering handle (2), which is set up to generate a reaction force acting against a deflection of the steering handle (2); - A primary setting device (12) which is set up for setting the reaction force generated by the reaction force actuator (5), and - A fallback adjustment device (14), which is set up to adjust the reaction force generated by the reaction force actuator (5) in the event of a malfunction of the primary adjustment device (12); wherein the primary setting device (12) is also set up to output a manipulated variable (S) for setting the wheel steering angle, and the fallback setting device (14) is also set up to set a manipulated variable (S ') in the event of a malfunction of the primary setting device (12) Output wheel steering angle; and wherein the fallback adjustment device (14) and the primary adjustment device (12) are designed differently from one another. The invention further relates to a method for operating a steer-by-wire steering system (1) for a motor vehicle.
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