2008 Suburban LTZ
Every now and then I get a very high pitch buzz from under the driver side dash. When I accelerate the noise gets louder and higher pitched. If I smack the lower center dash (the part that has the change holder and cup holder) the noise stops. It's really frustrating. It's not a dvd or anything. Sounds electrical. Any help would be appreciated.

 

Does it do it all the time with radio off, on?

 

It doesn't do it all the time, but it has happened with radio on and off.

 

Ok so it's not coming from a speaker. Increase in pitch with acceleration means it (whatever it is) is tracking the ignition. My "guess" is either a loose ground wire to cab, or if the ignition wireing is shielded, a ground issue on the shield.

 

Nope, not a speaker. Best guess is that it is something under the center console a foot below the radio. At least that's where I hit and it stops (until I start the car again, when it's happening). That's the other weird thing...it only happens once per car ride.

 

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I agree with "kevinkpk", sounds like a ground wire issue. I encourage to you consult with a certified technician for an official diagnosis.

If you have any additional questions, please feel free to contact me privately.

Please keep us posted.

Louis
GM Customer Service

 

Thank you!!!