I have a 2010 Enclave with the above mentioned codes along with the misfire codes. I am also getting the service stabilitrak error, the engine power reduced, and traction control error messages. This seems to be happening in cold weather only. I didn’t have this issue over the summer but I had it pop up once last winter and now again this winter. I am also noticing the engine is consuming oil between oil changes. Does anyone have experience with this or ideas what to check?