Yep, very common.
Nope, it'll happen again. It's a flawed design and despite the revisions they've made to the design over the years, they still fail.
The newest manifold should have been the only one available through 2016 if my sources were correct.Did these parts make it into the resupply chain by 2016?
My own 12 had both the manifold and valve cover changed with what they claimed were the "latest" revisions of said parts last year. VC #3. 20k after I sold it, I saw that it had the valve cover changed again.
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Most likely the cam cover requires replacement.....the burst disc (non-serviceable) that is part of the cover has torn.My 2012 LT has kicked out code P0171. Engine is running rough as well. I have noticed oil drops on the garage floor recently. Dealer said it's the camshaft (timing) cover. Is there a seal that needs to be replaced 'cause reading through this post it doesn't sound like it. Also, could a somewhat mechanically-inclined person (me do this job without much trouble?