Chevrolet Volt 2016 Owner's Manual page 211

210 Driving and Operating
Charging Status
Indicator
Short Flashing Green
(Flash rate increases
from one to four as the
battery charges)
Long Flashing Green
Solid Green
Yellow (Upon Plug-in)
Yellow (For Extended
Time Period after
Plug-in)
Short Flashing Green
(From one to four
flashes depending on
charge level)
Sound
One audible beep
Two audible beeps
None
None
None
Two audible beeps
Action/Reason
Charging has begun.
Charging is delayed by Programmable
Charging or, if the vehicle is equipped
accordingly, by a total utility interruption via
OnStar. Charging will begin later. See Utility
Interruption of Charging 0 219.
Charging is complete.
Charge cord is OK and the vehicle is not
yet charging.
Charge cord is OK, but the vehicle is not
charging. This may be due to a total utility
interruption via Onstar and charging will
begin later. See Utility Interruption of
Charging 0 219 or Malfunction Indicator
Lamp (Check Engine Light) 0 109.
Vehicle is charging but will pause/delay at
least once before the charge is complete.