I was driving my car yesterday on a spirited effort to clear a P0315 code when I turned a sharp corner and heard what I would describe as a power steering pump failure. It made this noise for about a minute or two and my steering wheel felt like a force feedback wheel on a Xbox 360; the further I turned the wheel the worse the feeling and the sound got. Well, in the spirit of learning, and the hope of replication, I turned the same corner again, but harder, and sure as heck it happened again except this time I could not steer the car at all for a few seconds..... Scary!!! I took it to the dealer and they said after some research that "this is a known issue on 2011 Mustangs built before X date 2010". They informed me that my Rack needed to be flashed and all would be good with the world. What I understand happened is that the electric motors that control assist fell out of calibration essentially fighting each other over left or right assist. I will add that my steering has always felt quirky since the day I got the car but after they flashed it I feel like I am driving a much better car. If you have a 2011 GT 500, and have experienced something similar to this, I would reccomend you get to the dealer and have your rack flashed.
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