I am just now dealing with this SAME issue with my 1.8L 2012 Cruze. Thank God I work at a trucking company where I had our mechanics run the code for me and we figured out it was the plastic linkage between the Intake manifold tuning valve and the solenoid BUT we cannot find the part anywhere and I'm sick to my stomach to have to spend $600-$900 for a $ 30.00 fix. That being said I have contacted my Dealership since I am still currently paying for the car and I am only at 60,000km and I bought the 7 year warranty to see if it will be covered by them BEFORE I bring it in. It is utter BS that GM doesn't have those parts separately. Or at least none that I could find.