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EV mode stops working

I went to lunch today (2-3 miles from work) and EV mode would not go on even at stoplights.  I even tried turning the car off and on but no luck.  The engine was on the whole time, although at lights it would go into a kind of hibernation where it was on but not doing anything according to the HEV display.  The battery was charged to the max.

The same thing happened on the way back from lunch.  Finally, just as I arrived back at work EV mode started working again.  I wonder if this is what Ford meant in the manual when they wrote on page 7:

Your hybrid high voltage battery may periodically re-condition itself to ensure maximum efficiency.  You may notice slight changes in drivability during this process, but it's an important part of your hybrid's high voltage battery opitmization features.

My great gas mileage of 44.5 for this tank is now 43 :-(

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    COme to my site dude. iam waiting for your response

Reader Comments (12)

I'll have to keep an eye out for that on my new FFH.

April 21, 2010 | Unregistered CommenterTraveller

Bill, what was your need for cabin heat that day? The behavior you explain here is common for me when I have the heat or defrost on, but when I turn them off then the ICE almost immediately shuts down.

April 22, 2010 | Unregistered CommenterKevin

@Kevin, I had no cabin heat or A/C on. It was a complete anomaly. Even when cabin heat is on, the engine will shut down until it gets too cold. During the trip to and from lunch, the engine didn't shut down once despite being warmed up.

April 24, 2010 | Registered CommenterBill Wood

I have never experienced what you describe then.

April 27, 2010 | Unregistered CommenterKevin

I had this happen to me today--it freaked me out a bit because while it was driving OK--the feel of the car was totally different. I even did the same thing as you--shut off the engine and turned it back on--but about 15 minutes later, it was back to normal. It also knocked my efficiency down about 1 mpg. Glad to hear that this is not likely a sign of a bigger problem--thanks for sharing your experience.

May 4, 2010 | Unregistered CommenterMike M

@Mike M yeah it hasn't happened to me since.

May 5, 2010 | Registered CommenterBill Wood

Thanks for sharing that. I have had mine for a year but have not noticed it. I will keep an eye for it.

June 20, 2010 | Unregistered CommenterJim

According to the manual, it sounds like it might do this to periodically tune the engine.

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July 24, 2010 | Unregistered Commenternfljerseyonline

I think it's on the temperature of the engine and hybrid components and the state of battery charge. Better watch over it.

December 19, 2011 | Unregistered CommenterPlumbing

I have a FFH as of Jan 2010. As you know, the FFH gets its best mileage when in EV mode mode or coasting. The computer will shut down the engine when its not needed. However, the engine needs to get to a warm state (as indicated by the temperature gauge) before it can be shut down. A warm engine may be restarted quickly and efficiently without burning excess fuel.

I have noticed many times on cold mornings with a fully charged battery, traveling under 45 on level ground, that EV mode will not engage. But, after the engine warms up, EV mode is re-enabled, so to speak. There is a line above the cold line on the temperature gauge which I believe is the "engine warm" indicator.

I live in Virginia. My long term mpg is 42.1 over 28k miles.

February 23, 2012 | Unregistered CommenterAndy

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