[obermd]

So today my wife's Clarity PHEV decided to idle the ICE for about 15 minutes. Full battery and I watched the car's power flow display showing the ICE providing a little power. The car showed it was in EV mode even though I could hear and "see" the ICE running.

Bottom line, Honda implemented an Engine Maintenance Mode to ensure the ICE runs periodically to lubricate seals and check for pressure leaks.