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  1. What is this noise when I turn my truck off?

    07.5-10 LMM Duramax Powertrain
    This might be a dumb question and hopefully this is normal. When I turn my truck off and get out, I can hear a noise thats wierd. It does it 3 or 4 times and it sounds like a spring when you flick it? Kind of like a vibrating or "eehhhhhh" (buzzing sound)? Is this normal and what is it?
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