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  1. S

    LM2 Valve Clatter

    I will be contacting GM to request additional warranty on my engine due to their mistake.
  2. S

    LM2 Valve Clatter

    I also had what sounded like valve noise during light acceleration. It seemed to get worse the closer to a regen it got. I had to bring the truck in to the dealer for a bad battery, and had them do an oil change( first one) while there. On my way home after picking it up, I noticed on my...
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