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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.

162 topics in this forum

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

    By cowboy86,
    • 19 replies
    • 2,099 views

  3. U bolts rear axle

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

  4. Leaking fuel

    By Joshua Jeremiah Day,
    • 5 replies
    • 102 views

  5. First oil change for Duramax

    By Butcher2,
    • 11 replies
    • 277 views

  6. LML Engine Noise Under Acceleration ~2000rpms

    By tko500,
    • 0 replies
    • 52 views

  7. Turbo spool noise

    By RACERX4772,
    • 3 replies
    • 342 views

  8. Drive Shaft Vibration 68-78 mph

    By whitlecj,
    • 6 replies
    • 1,100 views

  9. 2015 Silverado 2500hd fuel consumption

    By Udacha,
    • 9 replies
    • 606 views

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

    By WireBender,
    • 51 replies
    • 52,754 views

  11. 2018 Chevrolet 2500 HD rear tire spin 1 2

    By Hanover123,
    • 22 replies
    • 1,178 views

  12. Torque converter

    By FLORIDAMK,
    • 5 replies
    • 469 views

  13. Code P21DD (Reductant Tank Heater)

    By TinkeringFox,   
    • 2 replies
    • 31,905 views

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

    By Tx_operator87,
    • 18 replies
    • 1,240 views

  15. Diesel 1 2

    By cmysstailights,
    • 20 replies
    • 546 views

  16. Particulate filter not working

    By Jim Dunham,
    • 8 replies
    • 501 views

  17. DEF heater failure and engine light 1 2

    By Jnich17,   
    • 22 replies
    • 24,073 views

  18. 2015 Duramax: Cold Oil Pressure Bounces Off "0"

    By jasonvp,
    • 8 replies
    • 880 views

  19. Unusual DEF Behavior

    By TMac99,   
    • 4 replies
    • 5,270 views

  20. 2016 GMC Sierra 2500HD Service Trailer Brake System/Check Trailer Connection

    By GMCNuneZ71,
    • 4 replies
    • 390 views

  21. From 1/2 ton to 1 ton Duramax

    By Ron505,
    • 7 replies
    • 468 views

  22. 2015 brake job

    By ryanhardy,
    • 10 replies
    • 1,229 views

  23. Reverse lights in towing mirror 1 2 3

    By Lon Bossom,
    • 37 replies
    • 17,956 views

  24. Emissions problem and the dealership

    By Petrolhead,
    • 0 replies
    • 224 views

  25. New to me 2015 Denali hd diesel

    By cperk,
    • 5 replies
    • 559 views

  26. Fuel Mileage L5P 1 2

    By Peterd,
    • 22 replies
    • 18,404 views


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