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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.

224 topics in this forum

  1. Block Heater Short Recall

    By 2017HD,
    • 2 replies
    • 4.9k views

  3. Shell Rotella T6 15-40

    By gmacecsko,
    • 2 replies
    • 3.4k views

  4. Crank but no start

    By Btreadway2003,
    • 0 replies
    • 3.1k views

  5. 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
    • 4.9k views

  6. No power to driver side lowbeam

    By Scott77,
    • 1 reply
    • 1.5k views

  7. No power to driver side lowbeam

    By Scott77,
    • 0 replies
    • 1.3k views

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

    By sgnden,
    • 2 replies
    • 3.2k views

  9. DEF question

    By Sumrtime,
    • 12 replies
    • 2.4k views

  10. Reverse lights in towing mirror 1 2 3

    By Lon Bossom,
    • 39 replies
    • 55.4k views

  11. 6.0 tune needed after exhaust mods ?

    By Jec8563,
    • 8 replies
    • 5.8k views

  12. 2015 6.0 Burned Spark Plugs 1 2

    By WiscoZ71,
    • 15 replies
    • 13.2k views

  13. 2017 Duramax L5P base idle 1 2

    By jaws3,
    • 16 replies
    • 13k views

  14. L5p buying guide

    By Lspoo19,
    • 0 replies
    • 2.2k views

  15. Factory Torque Specifications 2017 Silverado LTZ 3500 HD 6.6

    By JJS-2017-3500-DURAMAX,
    • 0 replies
    • 2.2k views

  16. 2015 6.6 Duramax Chevy 3500 HD

    By JerryM72,   
    • 0 replies
    • 1.5k views

  17. Fuel leak causing engine shutdown

    By Dernie,
    • 1 reply
    • 6.1k views

  18. 2015 6.0 Catalytic Converter

    By Viceroy267,
    • 1 reply
    • 2k views

  19. PCV reroute

    By Diver6,
    • 0 replies
    • 2.5k views

  20. Code P21DD (Reductant Tank Heater)

    By TinkeringFox,   
    • 3 replies
    • 85.9k views

  21. Low Oil in Diesel Engine 6.6L 1 2

    By AK_ Maverick-X3,
    • 18 replies
    • 14.4k views

  22. 2018 L5P reduced power and cutting out

    By Danny R,   
    • 0 replies
    • 5k views

  23. 2018 L5P sudden loss of power and shut off

    By 480Ruger,   
    • 9 replies
    • 38.8k views

  24. CP4 Fail, how many out there?

    By COHauler,   
    • 2 replies
    • 2.5k views

  25. 2016 GMC Sierra 2500HD Service Trailer Brake System/Check Trailer Connection

    By GMCNuneZ71,
    • 8 replies
    • 13.2k views

  26. 2019 2500 6.6 Duramax High Idle

    By Brad Carruthers,
    • 4 replies
    • 14k views


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