CVT transmission

Proton Exora Bold Turbo with CVT Transmission. The owner told me that while he was driving, suddenly his car move slowly and stopped and the engine shut off by it self. Short stories. I try to turn the keys off and turn it on again and try to start but nothing happens. I've notice at the dash meter that the gear shift indicator didn't show up. But it only show this symbol [-].I have change for a second hand gearbox and the Transmission Control Unit. But the problem still unsolved. And a scan tool also were used to connect with the TCU but it failed to response even I have change it.