Our 2013 S85 has a high pitch whine at low speeds whenever the accelerator is depressed. The sound fades as the speed increases, but it annoyingly announces my arrival every day at work and later when I arrive home. So much for Tesla's silence. Several months ago the Scottsdale Service Center took the car for a test drive and acknowledged the sound as a "known issue" and indicated that "engineers are working on a fix that has not yet been released." The service rep indicated that the car was safe and the sound was not an indicator of a potential problem with the drivetrain. I was told that I would be contacted when a solution become available. I returned to the service center last week to report that the sound was getting worse and was advised again that no solution was yet available and the service rep didn't know when one might become available. When I again asked if this was a potential indicator of a developing problem with the drivetrain, this time there was no reassurance that the sound was non-problematic in terms of the potential for a breakdown. I wonder how many of us have this problem and if other service centers have been authorized to fix the annoying noise.