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The check engine light on my 2009 G6 has been coming on intermittently. I thought it was a gas cap issue as it had come on months ago, then shut off on it's own, but now it has come on again, but does go back off intermittently. We did recently have a cold snap here (temps. of -16 with -40 windchills), though it has thawed out now, and when I took it to a mechanic, he said that may have caused the light to come on, reset the light, but pulled the code which is p0010, however the light has been coming back on has usually been going back off. Any advice?