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Sound from rear of car

2549 Views 17 Replies 8 Participants Last post by  Dara
I 've had my 2011 for nearly 3 years and I know this sound is normal, but never really cared what it was until now. Usually within the first few minutes of my morning drive, there is a sound, sometimes two or three times which sounds as if you ran over a piece of rubber and it hits the wheel well. I always figured it may be something to do with the gas tank pressurization. Kind of like a low pitched thump or thud type noise. Pretty distinct noise, I'm sure any gen 1 owner will know the sound.
Anyway, what is it for sure???
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The spoiler expanse sound is a "pop" sound like an acorn hit the back of the car. The gas tank pressurization system (in the right rear) is a more rhythmic sound, like a small buzzing/banging sound.
I have had my 2014 for about 5 months. I have heard the "acorn" a couple of times. That is exactly what it sounds like.

2014 Volt Premium - Safety pkg 1 and 2, Navigation
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