Update...
So I took my 2009 in to the dealer today and had them read the code and see what is causing it. I got a call late in the day and the tech said good news/bad news.. Bad news is that we can't figure out what's causing the code. Good news is your car is running great.
Here are the notes from what they did:
Could not find any current issue with car at this time. Could possibly be related to Timing Exhaust Retarders (what the hell is that?) but no issue was found with them. Pulled a code P0300. No drivability problem, monitor data with C111, timing ok, A/F sensor switching normal, mass air flow normal, reset ecm, test drove vehicle 3 miles.
The tech said to come back if it comes on again.. I mean, I took it to the dealer because I figured if anyone could figure this out, they should be able to... Needless to say, they didn't.
At least they were pretty good - didn't charge me the normal $98 diagnostic fee...
Just thought I would post this for thought. If it comes back and I ever get it figured out, I'll post again..
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