HELP!drivetrain malfunction f30 intermittently

[bal3is]

I still haven't resolved the issue with the intermittent drivetrain malfunction. However I've unlocked the dashboard diagnostic menu and went to system voltage to see the voltage is dropping to 13.2V most of the time and when I allow the battery to charge to Over 14v while driving, I put it in neutral and turn it off and on and the wastegate moves into active position. It must be bad battery then?