High pitch buzz when revving or accelerating - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 06-26-2017, 01:39 PM Thread Starter
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High pitch buzz when revving or accelerating

I'm getting a buzz when the car is revved or is accelerating that sounds like it's right below the fuse box. I originally thought it was the flex pipe and the manifold since both were leaking so both have been replaced, and I'm still getting the buzz. I've also checked the vaccum line to the brake booster and the manifold for leaks with no results. Any ideas?
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post #2 of 4 (permalink) Old 06-26-2017, 01:41 PM Thread Starter
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I should also add that it's 2007 cobalt lt sedan automatic.
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post #3 of 4 (permalink) Old 06-27-2017, 07:21 AM
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Same issue here with my Automatic 06. From what I've read is a pump in the transmission may be the cause of the buzzing. I hear it when I accelerate under load, but when I put it into neutral, it isn't there. I'm checking the fluid level this weekend as low fluid can cause the noise. These are just a thought...


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post #4 of 4 (permalink) Old 06-27-2017, 03:14 PM Thread Starter
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Mine will do it in every gear. I'm going to check the line going to the evap can tomorrow to see if it's that but I have my doubts that that's it.
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