I do believe that after a long period if inactivity (3 or more days) the volt goes into a deep sleep to preserve the 12 V battery and not waste 12 V power conditioning the full battery.
Did you turn your car on? Was it at full charge?
Did you try to remote start it (burn some energy) and then plug it back in?
Did you turn your car on? Was it at full charge?
Did you try to remote start it (burn some energy) and then plug it back in?