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Hey guys I'm new to the forums this will be my first post but as i was reading some of these threads the other day before i was accepted I noticed this one and thought this info would be useful. I am a GM technician and have seen this issue on one other 6th gen personally but not mine. What I found after having an intermittent stabilitrac light and a pull to the left or right randomly was that the power steering rack fasteners have completely loosened. The design is a through bolt going vertically with a nut on top. In this particular situation the nut was missing on the left side and the right side was just loose. This may not be your fix but i would recommend checking to make sure. With the design of the subframe, the through bolts can't fully come out but it will cause the rack to shift during turning and cause a pull/steering wheel off center. Like I said may not fix your problem but something to look for.
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