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Dead battery 11th time

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5 replies to this topic

#1 OFFLINE   zone1090


    New Member

  • C-MAX Hybrid Member
  • 14 posts
  • Region:U.S. Northeast
  • LocationSalisbury
  • Current Vehicle:2013 C Max SE

Posted 16 November 2017 - 06:06 PM

Had car towed in to shop with dead car. I have installed a new battery about a month ago. Old battery tested good though.
After reading page after page of people with this problem I have never seen what anyone did to fix it.

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#2 OFFLINE   Plus 3 Golfer

Plus 3 Golfer

    C-Max Hybrid Member

  • C-MAX Hybrid Member
  • 2,022 posts
  • Region:Decline
  • Location"Valley of the Sun" - AZ
  • My C-MAX's Year:2013
  • Current Vehicle:2013

Posted 18 November 2017 - 09:44 AM

The Ford "fixes" were several CSPs /TSBs that you've likely had done.  I don't recall all of them but after the last Ford CSP 15b04, the reports of dead batteries / no start declined significantly.  I note that 15b04 expired in May 2016.


My guess is you have an intermittent, abnormal low or high resistance in wiring / connectors / modules / sensors that prevent certain modules from going to "sleep" when the car is off.  After so many hours, the "awake" modules drain the 12V battery to a SOC insufficent for the modules to operate (voltage is too low) when trying to start the car. 


Some of those with the "dead battery" issue had specific modules replaced and one had the module that attaches to the battery post replaced (can't recall the name, but it has a fuse and metering sensors for the 12V battery monitoring algorithm).  My guess in these "rare" instances where the dealer found a specific cause, the conditon was a "hard" failure which a good tech could isolate.  But, intermittent issues are very difficult to isolate as there are likely no DTCs stored and are virtually impossible to troubleshoot when the modules are active and the abnormal condition doesn't exist.  


I assume the "lemon law" in your state is no longer applicable to your car.  

#3 OFFLINE   obob


    C-Max Hybrid Member

  • C-MAX Hybrid Member
  • 709 posts
  • Region:Decline
  • LocationUS
  • My C-MAX's Year:2013
  • Current Vehicle:C-MAX SE

Posted 18 November 2017 - 11:48 AM

When I was having that problem before the "fix" I bought something like this which gave me confidence I was not going to be stuck somewhere.  With 4 dead batteries episodes I have a flavor of your experience.  


https://www.amazon.c... jumper starter


It might even be cheaper on black friday and there are lots of companies selling them.  (The one I linked is an "Amazon's choice" )

#4 OFFLINE   zone1090


    New Member

  • C-MAX Hybrid Member
  • 14 posts
  • Region:U.S. Northeast
  • LocationSalisbury
  • Current Vehicle:2013 C Max SE

Posted 20 November 2017 - 05:27 PM

After the first time (6months old) I bought and taught everyone how to use jump pack. Good thing because it has broke down with everyone.
Dealer tried to blame new battery until they found out I am in the battery business over 30 years. Last time they said battery was bad so I checked it myself and it still tested good on Midtronics tester. I changed it anyway.
Dealer managed to repower car and can't find any drains. So looks like we will bevdealing with
another session

#5 OFFLINE   maxine


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  • C-MAX Hybrid Member
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  • Region:U.S. Northeast
  • LocationVirginia
  • My C-MAX's Year:2015
  • Current Vehicle:C-Max Hybrid

Posted 25 May 2018 - 09:38 PM

I have a (used) 2013 SE and experience the dead battery issued.  However, I discovered that each time I forgot to turn off completely the climate control on the car at night, I would find the battery dead the next morning.  So for me, there must be some drain on the battery when leaving the climate control on.


I mentioned this on another post in the maxhybrid forum (not sure where I posted it) and one person replied that they doubted my "fix" was really a "fix," I stand by what I wrote back then because since I made my original post I have had the dead battery problem twice and both times as a result of my not turning off the climate control the previous night.


Hope this helps.    

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#6 OFFLINE   laup


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  • Region:U.S. Pacific Coast
  • LocationCA
  • My C-MAX's Year:2013
  • Current Vehicle:Ford Cmax

Posted 07 November 2018 - 01:49 PM

My radio stopped working and the corresponding entertainment panel would not work.  A day later, the car wouldn't start (dead battery) without a jump start.  The battery itself then charged quickly land seemed fine, including the radio.


The same thing happened two weeks later. 


I took it to the dealer.  After an electrical checkup, he concluded that I needed to replace the battery, which apparently was also draining the battery.  It took a few days to get the part and the installation, but all now SEEMS well.


Conclusion: I suppose that any of several components could cause battery drainage (others have mentioned being careful to turn off climate control at night).  But in my case, it was apparently the radio and its connections to the electrical system. 

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