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Hi all Had an interesting experience last evening. About mid-day, after completing a charge on the Charge-point at work, I pulled the car and parked it nearby before going back to work. At 5:30, I started the car to head home and was confronted by a series of faults, beginning with AdvanceTrac and ending with the check-engine light coming on. I stopped the car, re-started to no avail. The car was running ok, although cruise control wouldn't engage, among other thing. I drove home without incident and parked te car, figuring I'd call the dealer in the morning. When I restarted the car this morning, all the adults had cleared but the check-engine light. Around 10am, I called a dealer near work and set up an appointment for next Tuesday. Later, I restarted the car, after having driven for awhile, and the check-engine fault had cleared as well. At this point I called Rob, the Energi expert at Grappone Ford, in Concord NH, the guy who trained me to operate te systems, and learned what happened. He believes that I must have left the drivers door ajar most of the day yesterday (or left an interior light on) or otherwise caused the 12 volt system to drop blow the critical voltage threshold required by the computer and according to Ford, lost the system, causing the faults. The adults cleared once I drove the car and re-charged te 12 volt battery. So, FAIR WARNING..... It is critical that the 12volt system stay at spec. If it falls too far, the car won't even start until the 12 volt system is re-charged no matter how well charged the hybrid battery is. On a side note, I spoke with Ford customer service and two service managers at other dealers and none understood the problem and what to do to fix it, other than to schedule a service visit next week. Fortunately, Rob went through the same exercise last week with a C-Max that they left a NH Speedway in Laconia for a few days during race week. Constantly engaging the system by opening the driver-side door caused the 12volt system to discharge to the point where it threw so any faults, nothing worked. If you live in NH and know someone who's interested in the car, have team call Rob.... He's amazing. And Grappone sold 8 more Energis since I bought mine 6 weeks ago.