There is a TSB for it, but the fix is rather lame--they just use an anti-fungal spray on the filter. I had it done, but didn't notice any difference. My Gen 1 had it too. Basically it only happens when I turn the A/C off, which I now just avoid doing. That's my lame fix.
I smelled what I thought was gasoline fumes on the rare occasions when my ICE turned on. The problem was a broken oil filler cap that allowed oil to spray out and smoke when the ICE heated up. My dealer replaced the cap and all is well. This is the only thing that has ever broken on my Volt since I got it in Feb 2011.
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