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6.6L (LML/L5P) & 6.0L (L96/LC8) Tech

Technical discussion for the 2015-2016 Duramax 6.6L Turbo-Diesel V-8 (LML),  2017-2019 Duramax 6.6L Turbo-Diesel V-8 (L5P) and Vortec 6.0L V-8 (L96 / LC8) in the 2015-2019 Silverado HD and Sierra HD applications. Also includes, drivetrain, transmission, axles, differentials, and exhaust systems.

194 topics in this forum

  1. Necessary minimum tire pressure

    By Ben Dover,   
    • 12 replies
    • 753 views

  3. Code P21DD (Reductant Tank Heater)

    By TinkeringFox,   
    • 3 replies
    • 57,932 views

  4. Low Oil in Diesel Engine 6.6L 1 2

    By AK_ Maverick-X3,
    • 18 replies
    • 776 views

  5. 2018 L5P codes. P129F & P228C

    By Danny R,
    • 6 replies
    • 647 views

  6. Fuel 1 2

    By Waaazooo,
    • 20 replies
    • 4,086 views

  7. 2015 6.0 Burned Spark Plugs

    By WiscoZ71,
    • 14 replies
    • 1,565 views

  8. 2018 L5P reduced power and cutting out

    By Danny R,   
    • 0 replies
    • 304 views

  9. 2018 L5P sudden loss of power and shut off

    By 480Ruger,   
    • 9 replies
    • 14,168 views

  10. Buying 2018 2500 Denali w 25K Miles - Question Re Z71

    By sgnden,
    • 1 reply
    • 309 views

  11. CP4 Fail, how many out there?

    By COHauler,   
    • 2 replies
    • 407 views

  12. 2016 GMC Sierra 2500HD Service Trailer Brake System/Check Trailer Connection

    By GMCNuneZ71,
    • 8 replies
    • 1,726 views

  13. 2019 2500 6.6 Duramax High Idle

    By Brad Carruthers,
    • 4 replies
    • 904 views

  14. Tech link article on regen

    By calgator73,
    • 0 replies
    • 400 views

  15. Diesel Particulate Filter Regeneration Frequency

    By tripleb,
    • 9 replies
    • 7,280 views

  16. WHat size is the Diesel fuel tank?

    By flyingfool,
    • 10 replies
    • 733 views

  17. 4l80e transmission swap to 2016 2500 Silverado

    By angel ullom,
    • 5 replies
    • 698 views

  18. Looking at a 2016 6.0, What to Worry About or Check? 1 2

    By edgexcsp,
    • 19 replies
    • 2,685 views

  19. L5p Fuel Tank hissing/air leak sound

    By DmaxBranman,
    • 0 replies
    • 445 views

  20. door lock problem

    By glenn hofer,
    • 0 replies
    • 262 views

  21. Monitoring system for the L5P

    By 1BATES,
    • 1 reply
    • 633 views

  22. 6.0 pulling timing at 3000 RPM 1 2

    By Abarth500.,   
    • 17 replies
    • 3,369 views

  23. Short tube and long tube

    By Texas45,   
    • 5 replies
    • 1,386 views

  24. 6.0 tune needed after exhaust mods ?

    By Jec8563,
    • 4 replies
    • 741 views

  25. 2017 Duramax L5P base idle 1 2

    By jaws3,
    • 15 replies
    • 1,735 views

  26. 2018 6.6 duramax

    By Miles Brooks,
    • 3 replies
    • 867 views


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