Car completely dead after a few hours

[Anthony23]

Okay so we bought our 2017 Fusion Energi in July with 30,000 ish miles. Shortly after we went to get in it and drive somewhere and the battery was dead. I thought no biggie and jumped it. The problem continued and became a everyday thing. We took it to Ford, they updated software and gave us a new battery and sent us on our way $450 later. Wouldn’t you know it, about a week later it started dying again. We dealt with it for a little longer because we couldn’t afford to spend anymore on it at the time. We took it back to the same Ford dealer and they replaced the battery again and the gear selector because the blue ring around it and little orange light were staying on after the car was off. It kept dying after that and they told us they didn’t know what was wrong and we gave up and needed a car back so we went and got it after another $800 and not having a car for almost a month. The gear selector lights are still on and the car is still dying after a few hours of not driving. I use a jump pack to jump it and it doesn’t take anything to get it to start. As soon as I touch the cables to the car it’ll start right up. Any help would be appreciated, thanks.

[Waldo]

There were numerous software issues back in the 2016-2017 time frame that were causing 12V battery drain issues on the Energi.  What "software update" did they do?  I see a service message for the Drivers Door Module, but I think there were also issues with the TCU and some of the audio components.

[VonoreTn]

Business-wise, I would not have paid the dealer for the second service.  You are allowed to tell them up front that if this particular problem isn't fixed, you will not pay them anything.  If they don't like that, take it somewhere else, there are auto repair shops who will accept that arrangement.

 

You have a 12 volt current drain.  I'm going to guess as much as 800 miliamps.  (0.8 ampere) if it is draining the 12  volt battery in one day.  Possibly a light or a small cooling fan for the high voltage battery , which will run when everything is off.  At least you know it is not internal leakage in the 12 volt battery.  It's measurable, after the car has been off for an hour, with everything off, put a 10 amp max. meter in series with either battery terminal, and see how much current is flowing.  Let a mechanic do it if you are not familiar with battery safety practices.  From that point you start disconnecting 12 volt system fuses until the drain stops and note what fuse stopped it. 

Edited January 5, 2021 by VonoreTn
clarification