GPS Repairs - Mercedes GL X164 - audio 50 APS NTG 2.5 read error

Read error Audio 50 APS NTG 2.5.

The navigation DVD is only rarely or not at all recognised. The DVD sticks in device during ejection. The device interrupts the navigation during the journey and restarts calculation of the route. The DVD is ejected after insertion or is not accepted at all. In the display appears the error message READ ERROR.