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Guest Message by DevFuse

Get you C-MAX Energi Registered in the official Ford Authorized Registry. More here.

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How does 12V battery get charged?

charging 12v battery

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20 replies to this topic

#21 OFFLINE   Telemachus


    New Member

  • C-MAX Energi Member
  • Pip
  • 52 posts
  • Region:Decline
  • LocationRiverside, CA
  • My C-MAX:2013
  • Current Vehicle:Energi

Posted 13 April 2019 - 08:32 PM

Just started getting some battery issues today on my 2013 energi. First this morning the car went into "sleep mode". My son did some Googling and figured out where to put the key and how to get it out of sleep mode.

Charged it this afternoon, and tonight after dinner, it gave me a check engine light with a little wrench. Similar to the picture above.

Then the oddest thing, the car began to accelerate on its own even without my foot on the pedal. I would push the gas, and it wouldn't move any faster... just moderate acceleration. Luckily the brake worked.

I pulled over and shut it down. Sat for a while and started it back up. My Ford Mobile app warned that the 12V battery is low.

I'm hoping it's just and old, dead battery and not a problem with the new modem Inkust got replaced.

The acceleration thing was just weird though.  I guess all kinds of things can go haywire when the 12V goes out.


I stopped in Autozone and the battery tests at 8.8V...  obviously bad.


It's a Ford Motorcraft battery but I cannot see the date code.   I'll try to figure out how to replace the thing on Monday

Edited by Telemachus, 13 April 2019 - 10:22 PM.

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