The invention relates to an electrohydraulic and/or electromechanical motor vehicle control device (I), in particular for a motor vehicle brake system, including an electronic control unit (4), which is connected to a hydraulic unit (3) or at least to one electrically conductive housing part. The electronic control unit includes at least one first circuit board (5) for accommodating electrical or electronic components and includes at least one connecting plug (8), which electronic control unit is further characterized in that at least one electrically conductive connecting contact (6) is provided, which is connected to at least one electrically conductive fastening means (8) in such a way that there is an electrically conductive connection between the electrically conductive main body of the hydraulic unit (3) and/or the housing part and the reference potential of the circuit board (5) of the electronic control unit (4).