Question about 2006 Chevrolet Cobalt

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I have a 2005 cobalt and it has a humming noise in the rear of the car. can't pin point where its coming from?

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  • nenerican10 Jul 25, 2009

    No it doesnt make a noise when it sitting, actullay only starts when you hit about25 MPH. I was told it was the struts but no one can help me figure it out.

  • nenerican10 Jul 25, 2009

    No metal to metal contact at all, its have 68000 miles, and no work has been done to it since ive had it, and its been 2 years. The noise sounds like it has like an in take but a low sound and like something is loose, you can define it as a rattling noise. Please help, thanks for your time!!

  • nenerican10 Jul 25, 2009

    I have ramps, ill try moving the exauste a lil. No we haven't drving in snow or floodlike conditions. I hope that this is the solution though, Ive had this problem for over a year and now its getting louder and everyone I take it say they can't find whats wrong with it. They think Im crazy, but I know my car. Thanks again

  • nenerican10 Jul 25, 2009

    would it be possible that the struts, cv joints, could be causing a sound like that? I was just curious

  • nenerican10 Jul 25, 2009

    We've had the car for 2 years and no major brake work has been done. and the noise only happens when the car goes past bout 20 MPH. then the noise begins.

  • nenerican10 Jul 25, 2009

    Starts and continues... it has gotten louder over time though

  • nenerican10 Jul 25, 2009

    I'll try it when my girlfriend gets home. thanks for time and patience. We greatly appreciate it.

  • nenerican10 Jul 27, 2009

    Hello, well I did exactly what you said to do, and found the noise. its coming from the left rear rotor area. I'm thinking its a bearing? Im not exactly sure but I spun the rotor and heard the noise inside of it. Do you think that is what the cause? Also that rotor is bent inward, could that become a bigger problem if not taken care of right away?

  • nenerican10 Jul 27, 2009

    Thanks again so much, You have saved us money and time. I believe the actually part I need is a rear hub assembly, Is that correct? Just making sure so when I take it to the shop I can at least act like I know what Im talking about, lol!!

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Does it hum sitting as well as driving?Your fuel pump could be the problem some will make a noise before going bad.It sounds like something turn on,and shouldn't be!

Posted on Jul 25, 2009

  • 7 more comments 
  • Leonard Williams Jul 25, 2009

    Is there a different discription of the noise other than humming?It's not a metal to metal noise is it?and how many miles do you have?also did you ever have any work done on the rear of your car?

  • Leonard Williams Jul 25, 2009

    can you take your car to like a neighborhood muffler shop? or can you like put your car on ramps, or drive your car up on to the curb on one side so you can safely get under your car and grab your exhaust syatem to see it if came loose,do you remember going through a lot of snow or rain flooding since you had your car?

  • Leonard Williams Jul 25, 2009

    lets keep going until we get okay!

  • Leonard Williams Jul 25, 2009

    from the description of your compliant this noise occurs when your car is moving and not when it sits still right.If this is true it has to be a moving action noise,it is very possible that one of your rear axle bearings is defective,im going by you saying the noise sounds like it is coming from the rear,I dont think your CV joints are bad it's too soon with your mileage.but any thing is possible. how long have you had this? and did you have any work done on your rear brakes?

  • Leonard Williams Jul 25, 2009

    does the noise stop while you drive?or at a certain speed,or does it start about 20 mph and continues?

  • Leonard Williams Jul 25, 2009

    jack the car and see if you can spinn the tire on each side and try to duplicate the noise.I know you have to do this by hand but try.

  • Leonard Williams Jul 25, 2009

    okay good luck it's been fun.I help you more if needed.

  • Leonard Williams Jul 27, 2009

    congrats!!!! have a good mufler/brake shop look at your car,they usually dont charge,then you can decide if you want to fix it or let them. I knew you could do it.

  • Leonard Williams Jul 27, 2009

    yes.

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2 Answers

I have a 2005 chevy cobalt that is making a humming noise after 20 mph. I can also feel a vibration in the gas petal. "noise" increases with speed. Higher milage and just had struts replaced about 150


squeakey69 is right it sounds like you have a wheel bearing problem cobalts are notorious for wheel bearings going bad i would go ahead and change both front bearings because if one is going bad the other usually isnt far behind hope this helps.

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TSB 05-23-3 11/28/05 REAR AXLE NOISE REPAIR FORD: 1997-2005 Expedition, F-150 2002-2005 Explorer LINCOLN: 1998-2005 Navigator 2003-2005 Aviator MERCURY: 2002-2005 Mountaineer
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Rear diff noise


We have to be sure where the noise is coming from, a advise you or ask someone to do the following tests:
  1. jack your both your rear tires and make sure its stable. turn your tires either manually or by shifting gear into reverse and try listening to any humming or whiny sound or vibration not only from your rear differentials but also your transmisssion and independent transfer case.
  2. Be sure it secured and will not move and will not squish you under.
  3. also check on your rear propellers, differentials for excessive play
  4. If you determined where it is coming from, check on your gear oils.
My own assesment from what you have just told us, is I would also check on your clutch system, because whiney noise only exist when you are backing up the car. I hope you would pin point which part is causing the whiney noise to save you all the headache of having it repaired.
Comment after you determine where it is coming from.
Thanks for dropping by fixya

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