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High pitch whining when in electric

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2 replies to this topic

#1 OFFLINE   Thattamara


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  • Region:Decline
  • LocationAz
  • My Hybrid:C-MAX Hybrid
  • Current Vehicle:2013 Cmax hybrid

Posted 14 October 2017 - 06:21 AM

My 2013 cmax hybrid has recently started making a high pitch whining when it starts and every time it goes to electric. I used to hardly even know it was on but now I do. When stopped it actually slightly jumps when switching to gas. Why?

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Mr T

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  • Region:U.S.A.
  • LocationMount Dora, Fl
  • Current Vehicle:C-max

Posted 14 October 2017 - 08:33 AM

You could have a loose or worn belt!

#3 OFFLINE   pedroph


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  • Region:Canada
  • Locationontario
  • My Hybrid:C-MAX Energi
  • Current Vehicle:2017 C max energi

Posted 04 November 2017 - 06:23 AM

If the sound changes with speed/RPM it is a bearing in case of the engine could a pulley.

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