Fault Diagnostic Feature request (12v/DC to DC)

low priority, I am sure its been written that you can get the voltage of the 12v and the voltage from the DC to DC circuit. be useful among other diagnostics to have logic which could actively tell you your 12v is potentially duff, or the DC to DC circuit is iffy (as has happened on at least 1 car) - ie car status is ready but the voltage from it is low/ non existent.