The invention relates to a control device for an automatically and manually shiftable gearbox in a motor vehicle. The inventive control device comprises a selector lever (2) for adjusting at least the forward position (D), neutral (N), reverse (R), parking position (P) and a position (M) for manual shifting. A first and a second tip switch (3a, 3c) can be actuated in the position (M) for manual shifting. Signals for manually shifting up or down with regard to the gear ratio are supplied to a control device (7) for controlling the gearbox by means of position sensors (5) and control lines (6). Failure of the position sensors (5) and/or the control lines (6) that are allocated to said sensors can be detected. The control device is improved by configuring said control device (1), with regard to shifting, in such a way that all the position sensors can be checked and the failure of a position sensor and/or a control line can be detected at least in the parking position or reverse position of the selector lever. |