I've had my 1500 AT4 lil' Duramax for just over a year now. Currently it's in shop for DEF/emissions issue. Have any of you all had power steering error message during startup? Steering wheel goes stiff, can't drive. Only to go back an hour or so later and it starts up and drives just fine? Dealer stated they didn't see the error code and could not recreate the scenario to diagnose. Thoughts?
