I have a 2011 2LT. It's been sitting for 2 weeks due to ice, took it for a drive and I have a shaking in the steering both while driving and while parked. Checked the PS fluid, added some to bring it up to proper level, bled the system. I can turn the wheel just fine, but what gets me is while parked the steering wheel will shake, almost like the wheel bearings are bad.

Any ideas? I am thinking about flushing the PS system at the return line to see if that helps.

 

what is the tire pressure set at? Could it be low(ish) and dragging the tire through the arc?

 

Think I figured it out. Ended up flushing and refilling the power steering fluid using a method on YouTube that worked really well. 3/8" ID clear vinyl tubing is a must. No issue since finishing.