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6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)

Technical powertrain discussion specifically for the 2020+ L5P Duramax Diesel Engine and 10-Speed Allison Transmission combination on the 2020 through 2024+ Chevrolet Silverado 2500 / 3500 or 2020 GMC Sierra 2500 / 3500

145 topics in this forum

  1. Winter guard

    By gemarsh,
    • 7 replies
    • 908 views

  3. 2022 LP5 Loud Air Noise on Throttle and Bad Fuel Economy

    By aleeuw,
    • 9 replies
    • 461 views

  4. sultastic spring shackles

    By anthonybehnken,   
    • 8 replies
    • 2.3k views

  5. I try not to look at this section...

    By Jettech1,
    • 11 replies
    • 555 views

  6. 2020 and up, dpf system recall 1 2 3

    By shadow gray 2020 hd,
    • 42 replies
    • 13k views

  7. Need Deleted L5P Advice 1 2

    By Brozat4,
    • 29 replies
    • 31.4k views

  8. DEF Tank - Frozen

    By ArrowsmithPML,
    • 14 replies
    • 926 views

  9. Transmission fluid and filter change, temperature to check fluid level??

    By XY74,
    • 2 replies
    • 289 views

  10. Aux heater

    By gemarsh,
    • 3 replies
    • 345 views

  11. Fuel filter change with push-button start

    By Penndel Zeke,
    • 6 replies
    • 16.7k views

  12. 2022 Silverado 2500HD Duramax Transmission Temp High with Normal Driving, Not Towing 1 2 3

    By D Fowers,
    • 34 replies
    • 4.3k views

  13. Chrome Wheels for 2020 Sierra HD

    By TFrankl,
    • 1 reply
    • 454 views

  14. 2020 2500HD AT4 - 17K miles - Allison leaked and -REBUILD- 1500m from home 1 2

    By Kaamacat,
    • 16 replies
    • 3.4k views

  15. Allison 10 speed failure on a 2020 GMC 3500 with 13,500 miles

    By Richard Helm,
    • 3 replies
    • 1.3k views

  16. 2020 GMC AT4 Garbage Brakes! 1 2

    By SVAT4,
    • 16 replies
    • 12.4k views

  17. No key fob detected, no audio, column steering lock

    By Rob505,
    • 7 replies
    • 654 views

  18. 2020 3500 6.6 Duramax Fan stays on

    By jfatboy54,
    • 2 replies
    • 1.1k views

  19. 2021 Transmission Shudder

    By Jacksfr,
    • 2 replies
    • 1.1k views

  20. 2022 Wheel Stud Replacement

    By Shovelca,
    • 0 replies
    • 639 views

  21. Trailer brake

    By Johnny Giesbrecht,
    • 8 replies
    • 5.7k views

  22. 2023 2500HD,505 horsepower and 1,080 lb-ft of torque.

    By RBen,
    • 0 replies
    • 2k views

  23. Russia sanctions effect DEF URea manufactuering????

    By pokismoki,
    • 9 replies
    • 2k views

  24. Exhaust Fumes in Cab

    By Skilpot,
    • 14 replies
    • 6.9k views

  25. 220 Amp Alternator Question - 2021 Silverado 2500HD Duramax

    By tortiseshell,
    • 14 replies
    • 3.2k views

  26. Service DEF System - XX miles until 65 mph 1 2

    By swaptrex14,
    • 29 replies
    • 50.4k views


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