Need help with diagnosing problem with high pitch noise sounds like dental drill intermittently comes through Bose speakers and increasing frequency when accelerator depressed. Sometimes activated when an electrical system is activated such as break light or turn signal or rear console thermostat or fan switches are activated. Comes and goes. Can't always reproduce noise when vehicle is brought to dealership. Any help or thoughts would be greatly appreciated. Warranty almost expired.

 

could be the alternator or a ground issue somewhere (would be real hard to find). but because it increases with engine RPM that narrows it down to the alternator I think

 

I too have the same problem with my 09 Tahoe Hybrid. It just started a two months ago and it is getting worse. Seems to be more on the right backseat area when the radio is on, but also is evident when I turn on blinkers or break. Increases and decreases, comes and goes... very irritating and even worse if you are in the backseat. Please let me know what you find out. My dealership couldn't hear it when I took it in last month, but they will on my next trip. I'm hoping to help them narrow their search as I can see this being multiple trips and troubleshooting.

 

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Please keep us posted on the results of your next dealer visit.

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

Louis
GM Customer Service

 

Having the exact same trouble. What did you end up doing to fix the problem?

 

Hi rickner,

I'm sorry to hear that you are also experiencing this noise in your vehicle. I understand that you are trying to find a resolution from the other forum members. If you would like, I can contact your dealership on your behalf and further discuss your concern. Please send us a private message with your full contact information, VIN, current mileage, and dealership name if interested. I will be happy to help with your concern!

Kristen A.
Chevrolet Customer Care