6.6L Duramax Diesel (L5P)

205 topics in this forum

1. sultastic spring shackles

   By anthonybehnken, December 6, 2020   

   • Rear spring shackles
   • 8 replies
   • 4.4k views
   • 
   • asilverblazer
   • January 9, 2023

2. DEF Tank - Frozen

   By ArrowsmithPML, December 20, 2022
   • 14 replies
   • 13.3k views
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   • ArrowsmithPML
   • December 22, 2022

3. Aux heater

   By gemarsh, December 22, 2022
   • 3 replies
   • 2.8k views
   • 
   • CamGTP
   • December 22, 2022

4. Chrome Wheels for 2020 Sierra HD

   By TFrankl, November 30, 2022
   • 1 reply
   • 1.5k views
   • 
   • Core-Lokt
   • December 2, 2022

5. 2020 2500HD AT4 - 17K miles - Allison leaked and -REBUILD- 1500m from home 1 2

   By Kaamacat, October 7, 2021
   • 16 replies
   • 5.5k views
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   • 64BAwagon
   • November 7, 2022

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

   By Richard Helm, August 26, 2022
   • 3 replies
   • 3.8k views
   • 
   • Richard Helm
   • November 3, 2022

7. 2020 GMC AT4 Garbage Brakes! 1 2

   By SVAT4, September 28, 2020
   • 16 replies
   • 20.5k views
   • 
   • Will Fair
   • October 11, 2022

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

   By Rob505, August 19, 2022
   • 7 replies
   • 1.7k views
   • 
   • GMCustomerService
   • September 2, 2022

9. 2020 3500 6.6 Duramax Fan stays on

   By jfatboy54, July 19, 2022
   • 2 replies
   • 8.7k views
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   • redwngr
   • August 17, 2022

10. 2021 Transmission Shudder

    By Jacksfr, August 5, 2022
    • 2 replies
    • 6.3k views
    • 
    • GMCustomerService
    • August 5, 2022

11. 2022 Wheel Stud Replacement

    By Shovelca, July 22, 2022
    • 0 replies
    • 1.6k views
    • 
    • Shovelca
    • July 22, 2022

12. Trailer brake

    By Johnny Giesbrecht, January 28, 2020
    • 8 replies
    • 10.1k views
    • 
    • GMCustomerService
    • July 22, 2022

13. 2023 2500HD,505 horsepower and 1,080 lb-ft of torque.

    By RBen, June 21, 2022
    • 0 replies
    • 5.2k views
    • 
    • RBen
    • June 21, 2022

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

    By pokismoki, March 18, 2022
    • 9 replies
    • 3.2k views
    • 
    • Diver6
    • June 17, 2022

15. Exhaust Fumes in Cab

    By Skilpot, February 25, 2020
    • 14 replies
    • 17k views
    • 
    • trkpro
    • May 17, 2022

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

    By swaptrex14, October 30, 2020
    • 29 replies
    • 136.4k views
    • 
    • CHARLI
    • April 29, 2022

17. 3500 SRW vs DRW

    By jeffd, April 19, 2022
    • 3 replies
    • 10.1k views
    • 
    • MTU Alum
    • April 21, 2022

18. 2021 Duramax

    By Harold Desautel, January 26, 2022
    • 1 reply
    • 2.6k views
    • 
    • kmonto
    • April 18, 2022

19. Duramax exhaust pipe

    By Walkerman, February 21, 2022
    • 1 reply
    • 2.5k views
    • 
    • newdude
    • February 21, 2022

20. Dmax Plant Expansion

    By C/K Man, January 1, 2022
    • 1 reply
    • 2.1k views
    • 
    • Z45
    • January 1, 2022

21. 2020 6.6 D-max towing MPG 1 2 3

    By Lfod1836, December 4, 2019
    • 33 replies
    • 30.3k views
    • 
    • nutdriver
    • December 31, 2021

22. Dealer oil change

    By shadow gray 2020 hd, December 16, 2021
    • 12 replies
    • 10.4k views
    • 
    • Grumpy Bear
    • December 21, 2021

23. 10 speed Allison Transmission 1 2 3

    By Double Dkar, September 1, 2019
    • 41 replies
    • 61.9k views
    • 
    • newdude
    • December 7, 2021

24. High RPMs downhill

    By JHarris32, July 22, 2020
    • 7 replies
    • 9.3k views
    • 
    • aliveguy5
    • December 7, 2021

25. Transmission Fluid Change

    By mark_in_co, November 27, 2021
    • 3 replies
    • 18k views
    • 
    • Black02Silverado
    • November 27, 2021