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  1. gemarsh

    2021 Sierra Denali 3.0

    Have not heard of that problem yet. Have you tried changing the glass angle while it's whistling? Maybe try painters tape over the gaps on the body of the mirror and try to narrow it down. Any bug deflator on the hood? Window vent visors? What happens if you crack the window down an inch or...
  2. gemarsh

    2025 Tahoe / Suburban to get LZ0 Duramax 3.0

    Is this for the 2025?
  3. gemarsh

    DEF empty warning, but DEF tank is FULL.. Anyone have this issue?

    I thought I read somewhere that gm says a tank of def should last for an oil change. Don't think that is if a person is pulling the whole time.
  4. gemarsh

    DEF empty warning, but DEF tank is FULL.. Anyone have this issue?

    You have 8 year or 80k miles, whichever comes first for warranty.
  5. gemarsh

    DEF empty warning, but DEF tank is FULL.. Anyone have this issue?

    When was the flash done? GM just came out with this. Did you have this one done?...
  6. gemarsh

    Fuel gauge linearity.

    The obs fuel gauge was the same. A person could go for what seemed like forever on the top half. You get to the 1/4 mark, it dropped like a rock. The square body? That damn thing bounced around like peewee Herman.
  7. gemarsh

    New member, 1 st post. 2020 High Country Duramax.

    Welcome. After 14 years you were do an update.
  8. gemarsh

    2500 ZR2 Duramax

    None around here yet.
  9. gemarsh

    USB fuse

    Nope. Just the 12v accessory outlet.
  10. gemarsh

    Lucky 2024 Chevy 1550 LTZ owner

    Welcome
  11. gemarsh

    Thats Funny

  12. gemarsh

    LZO Regen tracking with Torque

    Yes, regen quits at an idle after so many seconds. Bumping the high idle "on" also won't allow it to continue.
  13. gemarsh

    Wiper Blades

    Believe it or not, that is one of the things I use from gm since the 90's. Used to be a Ammco fan boy. Don't seem to have delamination of the squeegee with the gm's. Just streaks from trying to clear ice too fast, but they all fail from that. Also, rock auto has them priced where they are...
  14. gemarsh

    P0016 Code

    Any drive ability issues? Or just that pesky cel?
  15. gemarsh

    Not feeling good about the PF66 filter

    2.5-10 microns.
  16. gemarsh

    Duramax passing power

    The 3.0 is no slouch, it's torque is at the bottom end of the band. So if your doing 70mph, yes, it doesn't have the pep of a V8 to pass someone, trying to get to 90mpg to get it done before a no pass zone. It's no corvette, but its also no chevette.
  17. gemarsh

    Power chips

    Don't believe there is much out there for chips.
  18. gemarsh

    Not feeling good about the PF66 filter

    Are you dumping the filtered oil back into the fill cap?
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