Chevrolet Volt 2016 Owner's Manual page 210

If the vehicle is plugged in and the
CSI is off, a total utility interruption
using OnStar or a charging fault has
been detected. See Utility
Interruption of Charging 0 219 or
Charge Cord Status Indicators in
Charge Cord 0 213.
If equipped, the charge port bezel
light acts as an additional CSI when
the vehicle is plugged in and
charging. It will flash along with the
CSI on the instrument panel. When
the charge port door is open and the
vehicle is not plugged in, the bezel
light stays on solid to light the
charging receptacle.
A message displays if the vehicle is
not able to charge.
Following is the vehicle feedback
when the charge cord is plugged in.
Driving and Operating 209