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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.

216 topics in this forum

  1. 6.0 pulling timing at 3000 RPM 1 2

    By Abarth500.,   
    • 18 replies
    • 8.8k views

  3. Buyer beware, CNG

    By CNGTruck,
    • 4 replies
    • 808 views

  4. Fuel gauge sticking.

    By Mike Hamm,
    • 0 replies
    • 383 views

  5. 2015 GMC Sierra 3500HD SRW rear caliper torque spec

    By Matt Ziprick,
    • 4 replies
    • 615 views

  6. 2017 Duramax Recommends Using Only GM DEF to Avoid Problems 1 2

    By jimstringer,   
    • 22 replies
    • 60.9k views

  7. Worth buying high mileage trucks?

    By Katkinson1112,
    • 11 replies
    • 3.2k views

  8. Glow plug that is haunted lol

    By topdj,
    • 0 replies
    • 764 views

  9. 2018 L5P codes. P129F & P228C

    By Danny R,
    • 10 replies
    • 14.4k views

  10. DEF heater failure and engine light 1 2

    By Jnich17,   
    • 28 replies
    • 69.9k views

  11. start engine to view application

    By LabOne,
    • 0 replies
    • 840 views

  12. '17 2500hd 6.0L Long Tube Headers? 1 2

    By Biggerdogg01,
    • 23 replies
    • 12k views

  13. Cam Swap 2015 6.0 1 2

    By JesseJames94,
    • 21 replies
    • 26k views

  14. Service theft deterrent system

    By Trevo-all,
    • 0 replies
    • 1.8k views

  15. The great debate…. L5P oil

    By MichDirtyMax19,
    • 6 replies
    • 1.4k views

  16. 2018 GMC Sierra Duramax 6.6

    By rvillaverde,
    • 0 replies
    • 3k views

  17. Necessary minimum tire pressure

    By Ben Dover,   
    • 14 replies
    • 6k views

  18. Block Heater Short Recall

    By 2017HD,
    • 2 replies
    • 3k views

  19. Shell Rotella T6 15-40

    By gmacecsko,
    • 2 replies
    • 1.8k views

  20. Crank but no start

    By Btreadway2003,
    • 0 replies
    • 1.6k views

  21. Code P2297 oxygen sensor (O2) has out of range sensor performance when the vehicle is decelerating for bank 1 sensor 1

    By Robert Hahn,
    • 0 replies
    • 1.9k views

  22. No power to driver side lowbeam

    By Scott77,
    • 1 reply
    • 962 views

  23. No power to driver side lowbeam

    By Scott77,
    • 0 replies
    • 879 views

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

    By sgnden,
    • 2 replies
    • 2.7k views

  25. DEF question

    By Sumrtime,
    • 12 replies
    • 1.8k views

  26. Reverse lights in towing mirror 1 2 3

    By Lon Bossom,
    • 39 replies
    • 48.6k views


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