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4 comments
Mike Alfieri
Mike Alfieri

That happened in our envoy. I think it has something to do with the noise cancelling thing. But, I disconnected the rear entertainment system in the envoy and hadn't had problems since.

Adrian Motta
Adrian Motta

So funny I had the same high pitched noise in my 05 Sierra that started a week after I bought it. I figured it was the rear passenger door speaker so I disconnected it and haven't had a problem since!

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