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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.

165 topics in this forum

  1. Seat belt Shoulder restraint removal top pillar bolt

    By Mud168,
    • 0 replies
    • 20 views

  3. CANADIAN SPEC 2015 2500HD LT 6L FLEXFUEL

    By David Ardin,
    • 3 replies
    • 137 views

  4. Make tow mirror parking lights blink with turn signal 1 2

    By Tx_operator87,
    • 22 replies
    • 1,599 views

  5. 2019 GMC L5P Tuners

    By rvkeller,
    • 3 replies
    • 138 views

  6. 6.0 pulling timing at 3000 RPM

    By Abarth500.,   
    • 7 replies
    • 1,324 views

  7. 2017 L5P runaway!!!!!engine gone.. scary..now what? 1 2

    By cowboy86,
    • 19 replies
    • 2,467 views

  8. U bolts rear axle

    By Jean-Marc L'Eplattenier,   
    • 1 reply
    • 181 views

  9. Leaking fuel

    By Joshua Jeremiah Day,
    • 5 replies
    • 162 views

  10. First oil change for Duramax

    By Butcher2,
    • 11 replies
    • 381 views

  11. LML Engine Noise Under Acceleration ~2000rpms

    By tko500,
    • 0 replies
    • 90 views

  12. Turbo spool noise

    By RACERX4772,
    • 3 replies
    • 426 views

  13. Drive Shaft Vibration 68-78 mph

    By whitlecj,
    • 6 replies
    • 1,203 views

  14. 2015 Silverado 2500hd fuel consumption

    By Udacha,
    • 9 replies
    • 701 views

  15. Which Engine Oil (conventional or synthetic) 1 2 3 4

    By WireBender,
    • 51 replies
    • 54,686 views

  16. 2018 Chevrolet 2500 HD rear tire spin 1 2

    By Hanover123,
    • 22 replies
    • 1,305 views

  17. Torque converter

    By FLORIDAMK,
    • 5 replies
    • 520 views

  18. Code P21DD (Reductant Tank Heater)

    By TinkeringFox,   
    • 2 replies
    • 36,569 views

  19. Diesel 1 2

    By cmysstailights,
    • 20 replies
    • 638 views

  20. Particulate filter not working

    By Jim Dunham,
    • 8 replies
    • 537 views

  21. DEF heater failure and engine light 1 2

    By Jnich17,   
    • 22 replies
    • 26,458 views

  22. 2015 Duramax: Cold Oil Pressure Bounces Off "0"

    By jasonvp,
    • 8 replies
    • 964 views

  23. Unusual DEF Behavior

    By TMac99,   
    • 4 replies
    • 5,444 views

  24. 2016 GMC Sierra 2500HD Service Trailer Brake System/Check Trailer Connection

    By GMCNuneZ71,
    • 4 replies
    • 437 views

  25. From 1/2 ton to 1 ton Duramax

    By Ron505,
    • 7 replies
    • 557 views

  26. 2015 brake job

    By ryanhardy,
    • 10 replies
    • 1,287 views


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