2013 Chevrolet Volt Owner Manual - Page 238

9-52 Driving and Operating Sound One horn chirp Two horn chirps Action/Reason Charging has begun. Charging is delayed by Programmable Charging or, if vehicle is equipped accordingly, by a total utility interruption via OnStar. Charging will begin later. See Utility Interruption of Charging on page 9‑55. Charging is complete. Charge cord is okay and vehicle is not yet charging. Charge cord is okay, but 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 on page 9‑55 or Malfunction Indicator Lamp on page 5‑18. Insufficient time to fully charge by departure time. Charge cord connection should be checked. Charging Status Indicator Solid Green Long Flashing Green Short Flashing Green Yellow (Upon Plug-in) Yellow (For Extended Time Period after Plug-in) None None None Solid Green or Long Flashing Green None (Upon Plug-in) Four horn chirps None