A back-up system is in place should a fault occur in the control system.
If the gear is highlighted in the instrument cluster display, a system malfunction has occurred. In this case, the S tronic gearbox will switch to a backup programme. In certain cases, you may not be able to select reverse gear.
Caution!
If the gearbox switches to the back-up programme, drive to a qualified workshop without delay and have the fault rectified.