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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.

210 topics in this forum

  1. Service theft deterrent system

    By Trevo-all,
    • 0 replies
    • 441 views

  3. The great debate…. L5P oil

    By MichDirtyMax19,
    • 6 replies
    • 610 views

  4. 2018 GMC Sierra Duramax 6.6

    By rvillaverde,
    • 0 replies
    • 597 views

  5. Necessary minimum tire pressure

    By Ben Dover,   
    • 14 replies
    • 3.5k views

  6. Block Heater Short Recall

    By 2017HD,
    • 2 replies
    • 1.4k views

  7. Shell Rotella T6 15-40

    By gmacecsko,
    • 2 replies
    • 661 views

  8. DEF heater failure and engine light 1 2

    By Jnich17,   
    • 27 replies
    • 58.4k views

  9. Crank but no start

    By Btreadway2003,
    • 0 replies
    • 466 views

  10. 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
    • 642 views

  11. No power to driver side lowbeam

    By Scott77,
    • 1 reply
    • 457 views

  12. No power to driver side lowbeam

    By Scott77,
    • 0 replies
    • 362 views

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

    By sgnden,
    • 2 replies
    • 1.9k views

  14. 2018 L5P codes. P129F & P228C

    By Danny R,
    • 9 replies
    • 7.2k views

  15. DEF question

    By Sumrtime,
    • 12 replies
    • 943 views

  16. Reverse lights in towing mirror 1 2 3

    By Lon Bossom,
    • 39 replies
    • 41.2k views

  17. 6.0 tune needed after exhaust mods ?

    By Jec8563,
    • 8 replies
    • 2.7k views

  18. 2015 6.0 Burned Spark Plugs 1 2

    By WiscoZ71,
    • 15 replies
    • 5.5k views

  19. 2017 Duramax L5P base idle 1 2

    By jaws3,
    • 16 replies
    • 5.8k views

  20. L5p buying guide

    By Lspoo19,
    • 0 replies
    • 1.2k views

  21. Factory Torque Specifications 2017 Silverado LTZ 3500 HD 6.6

    By JJS-2017-3500-DURAMAX,
    • 0 replies
    • 1.1k views

  22. 2015 6.6 Duramax Chevy 3500 HD

    By JerryM72,   
    • 0 replies
    • 1k views

  23. Fuel leak causing engine shutdown

    By Dernie,
    • 1 reply
    • 1.6k views

  24. 2015 6.0 Catalytic Converter

    By Viceroy267,
    • 1 reply
    • 1.4k views

  25. PCV reroute

    By Diver6,
    • 0 replies
    • 1.3k views

  26. Code P21DD (Reductant Tank Heater)

    By TinkeringFox,   
    • 3 replies
    • 74.5k views


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