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Guest Message by DevFuse

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Register your Fusion Hybrid at the official Ford authorized registry here.

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TCU/Modem Stopped Working

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1 reply to this topic

#1 OFFLINE   SteveBoston


    New Member

  • Fusion Hybrid Member
  • 7 posts
  • Region:U.S. Northeast
  • Location:Massachusetts
  • Current Vehicle:Fusion Energi
  • My Hybrid's Year:2017

Posted 06 June 2017 - 10:38 AM

My car suddenly stopped sending data to MyFordMobile.   It started happening after going to NH and parking where there was no cell phone service.  I also noticed that the ESN serial number was blank on the car display screen.


I suspected that it might be a software problem that hadn't been noticed during testing where the software either, shuts down or goes into a loop, if no cell phone service was available.


My son looked up recent service bulletins and found the problem.  It requires that fuse #10 be removed for five minutes and replaced.  Also,

a software update is needed.  As soon as he replaced the fuse the ESN number appeared.  Now I just have to go in for a software update.


This affects cars with build dates through 3/16/2017.


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#2 OFFLINE   luckyleo


    New Member

  • Fusion Hybrid Member
  • 4 posts
  • Region:U.S. Southern Atlantic
  • Location:Florida
  • Current Vehicle:Ford Fusion Energi
  • My Hybrid's Year:2017

Posted 27 December 2017 - 07:58 PM

 I also hit this issue.  Ford gave me SSM (Special Service Message) 46661 and said to get the dealer to perform the update.

The dealer warned it could take up to 5 hours for the update.   Luckily it was completed within 1 hour. 

On the receipt from dealer I see the OBD-II gave a DTC of U0178 (loss of communication).

Glad it was easy to fix and still under warranty.  Not sure what a software update would cost.

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