Not sure why the PiP doesn't like the Volt's EVSE, but the Volt is perfectly happy using the PiP's EVSE to charge. Go figure. Another quirk of the Volt (or it's EVSE) is that it doesn't like if there is any other EVSE on the same circuit as it is, including another Volt. At work we have to share a single 120V circuit amongst 3 or 4 cars. The Leaf & PiP EVSEs are perfectly happy sharing the circuit. But if there is a Volt EVSE already plugged in, and I plug in my PiP, the Volt will eventually stop charging and it's EVSE will start blinking it's trouble lights. Thankfully in the next month or two work will be replacing the old legacy EV chargers (used either an inductive paddle, or a funky AVCON connector) with new chargers that support the new J1772 connector, so we won't have to compete as much for charging purposes.