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    Loud hissing sound

    Oh I put Power Service in it before all this happened. Still had gel.
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    Loud hissing sound

    It peaked at -10. The dealer changed the fuel filter and let it warm up overnight in their shop and that seemed to do the trick. I asked if there was anything more that I could do to prevent it from happening again and the response was park it in a garage, which my truck won't fit into.
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    Loud hissing sound

    Now she won't shift out of third gear without the engine shutting completely off and I am getting the reduced engine power service ESC message. Limped it to the dealership and the guy at service told me the fuel was probably gelled which I though was interesting considering I have been using...
  4. D

    Loud hissing sound

    My 2020 gmc started making this loud hissing noise the other day and it seems to be getting worse. Not sure if it is the cold weather or some other issue. Anybody else experiencing this?
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    Just a few mods.

    Thanks! Did you have to make any modifications to add it or did it bolt right on?
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    Just a few mods.

    Thanks for the info. Great looking truck!
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    Just a few mods.

    I've been searching for skid plates for my 2020 Sierra. Did you have to order yours from the dealer?
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    Accessories and Add Ons?

    I have been having a tough time finding accessories for my 2020 Sierra. It seems a lot of the websites I have checked specifically say the accessories won't fit the diesel models, or they don't sell accessories that fit them at all. Has anyone else run into this? I am looking for skid plates and...
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