I have a 2013 Volt. Yesterday, the check engine light came on. OnStar told me it was "High Voltage Charging System not performing as expected." The car is charging fine. They told me the light should go away. It has been through the 5 to 7 drive cycles and the light has not gone off. I talked to OnStar today and there were now two codes. According to the dealer I went today, they need to replace the charging connector on the car side and do a software update. Yet the charging connector is on national backorder. Very frustrated that a critical part like this is on backorder with no ETA. Anyone know if it actually is or is the dealer trying to not have to do the work? My car is CPO by the way.