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2010 Sierra Hybrid strange sound

This topic contains 0 replies, has 1 voice, and was last updated by  frophotos 1 year, 7 months ago.

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    frophotos
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    2010 GMC Sierra Hybrid makes a strange sound when the gas engine shuts off. Seems like it is coming from the top of the engine. Rattles the engine a lot and kind of a grinding clicking pumping noise. Wish I could describe it better. I took video but not sure I can attach it.

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