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Humming sound

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2 replies to this topic

#1 OFFLINE   Komet


    New Member

  • C-MAX Energi Member
  • Pip
  • 6 posts
  • Region:U.S. Pacific Coast
  • LocationCovina, CA
  • My C-MAX:2015
  • Current Vehicle:2015 Cmax Energi, with panoramic roof

Posted 24 November 2018 - 07:57 AM

What is that humming sound that cycles on and off? Seems to be in the front of the car. I am guessing some electrical component. I have no error codes. Can anyone explain what that is?

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#2 OFFLINE   rbort


    Energi Member

  • C-MAX Energi Member
  • PipPip
  • 4,287 posts
  • Region:U.S. Northeast
  • LocationFranklin, MA
  • My C-MAX:2017
  • Current Vehicle:Cmax Energi Titanium with Moonroof

Posted 24 November 2018 - 08:25 AM

Could be the electric Brake booster.



#3 OFFLINE   cr08


    New Member

  • C-MAX Energi Member
  • Pip
  • 249 posts
  • Region:U.S. Great Lakes
  • LocationColumbus, Ohio
  • My C-MAX:2013
  • Current Vehicle:2013 Ice Storm C-Max Energi

Posted 24 November 2018 - 10:56 AM

If it is pretty audible and happens reliably after startup in addition to other times, it is very likely the vacuum pump for the brake system and is normal. It just tends to be a bit louder than other vehicles.

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