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On my 2017 Volt LT, Anyone know what that slight "tin" clunk sound is when accelerating in gas mode? Its most noticable in city driving and hard acceleration. Almost sounds like some sort of mechanical baffle engaging and disengaging.
 

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Did you ever update the software? There is a backfire problem that they fixed with a sw update. I believe it also causes clogged EGR. So update ASAP if you haven't done so.
 

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Is it a single knock that occurs as you first start to accelerate and/or decelerate?
 

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Sounds like you have the very common backfire issue. To me, it sounded like I had kicked up a small stone that had hit the muffler every time I switched from electric to gas. Have the dealer apply the TSB 1-NA-17 update.
 
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