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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.

222 topics in this forum

  1. MAP Sensor cage.

    By BNSF,
    • 1 reply
    • 1.5k views

  3. Worth buying high mileage trucks?

    By Katkinson1112,
    • 12 replies
    • 8.5k views

  4. Shifting issues

    By jacob keese,
    • 0 replies
    • 621 views

  5. L5P back to shop

    By Jackie Emery Andrus,   
    • 0 replies
    • 663 views

  6. Manual shifting not working

    By Ryan Fischer,
    • 0 replies
    • 850 views

  7. Turns over but won't start without ether

    By kbm0084,   
    • 9 replies
    • 14.6k views

  8. wont start without ether please help

    By TRAVOSE20,
    • 0 replies
    • 951 views

  9. coils and wires

    By dynoray,
    • 0 replies
    • 1.2k views

  10. 6.0 pulling timing at 3000 RPM 1 2

    By Abarth500.,   
    • 18 replies
    • 12.2k views

  11. Buyer beware, CNG

    By CNGTruck,
    • 4 replies
    • 2.2k views

  12. Fuel gauge sticking.

    By Mike Hamm,
    • 0 replies
    • 1.6k views

  13. 2015 GMC Sierra 3500HD SRW rear caliper torque spec

    By Matt Ziprick,
    • 4 replies
    • 3.3k views

  14. 2017 Duramax Recommends Using Only GM DEF to Avoid Problems 1 2

    By jimstringer,   
    • 22 replies
    • 66.4k views

  15. Glow plug that is haunted lol

    By topdj,
    • 0 replies
    • 1.9k views

  16. 2018 L5P codes. P129F & P228C

    By Danny R,
    • 10 replies
    • 21.5k views

  17. DEF heater failure and engine light 1 2

    By Jnich17,   
    • 28 replies
    • 77.6k views

  18. start engine to view application

    By LabOne,
    • 0 replies
    • 1.9k views

  19. '17 2500hd 6.0L Long Tube Headers? 1 2

    By Biggerdogg01,
    • 23 replies
    • 16.2k views

  20. Cam Swap 2015 6.0 1 2

    By JesseJames94,
    • 21 replies
    • 30.8k views

  21. Service theft deterrent system

    By Trevo-all,
    • 0 replies
    • 3.5k views

  22. The great debate…. L5P oil

    By MichDirtyMax19,
    • 6 replies
    • 3.3k views

  23. 2018 GMC Sierra Duramax 6.6

    By rvillaverde,
    • 0 replies
    • 5.6k views

  24. Necessary minimum tire pressure

    By Ben Dover,   
    • 14 replies
    • 9.6k views

  25. Block Heater Short Recall

    By 2017HD,
    • 2 replies
    • 4.6k views

  26. Shell Rotella T6 15-40

    By gmacecsko,
    • 2 replies
    • 3.1k views

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