One problem related to steering has been reported for the 2013 GMC Sierra. The most recently reported issues are listed below.
The steering on the pickup truck sticks, locks up for a moment then frees itself. I have been having on and off issues since but the dealership is already trying to get out of any responsibility already stating this is out of warranty at this date. Salt lake valley GMC has been aware of the issue since day one. This has become a saftey issue, the vehicle in question is not safe to drive at this time and I am left holding the bag for a mystery they cannot solve (or gm is covering up yet another problem) note this truck is the duramax 2500.