Just purchased a brand new Denali four days ago and as soon as I put the car in gear (forward or reverse) I hear a very high pitch electrical chirp from driver's side dash speaker. It seems to be primarily present when applying gas once driving. If I start the car and never put it into gear, none of this high pitch feedback is present once I shut it off. However, if I start the car and stay in place with the brakes applied, then shut the car off, there is a lot of this chirping. The chirping can be heard even with the stereo is very loud. Very frustrated having paid so much money and the chirp is very annoying. Thinking this may be a side effect of a malfunctioning Active Noise Cancellation system, but overall fearful it will be hard to diagnose. All cell phones have been shut off and noise is still present so it is not electrical interference with cell phones. Have an appointment with the local dealership in a week and a half. Appreciate any help!!
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