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

138 topics in this forum

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

   By D Fowers, July 20
   • 22 replies
   • 1.5k views
   • 
   • leon dwinga
   • Monday at 06:16 PM

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

   By shadow gray 2020 hd, May 25
   • 34 replies
   • 7.6k views
   • 
   • Libertized
   • September 17

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

   By Rob505, August 19
   • 7 replies
   • 354 views
   • 
   • GMCustomerService
   • September 2

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

   By Kaamacat, October 7, 2021
   • 14 replies
   • 2.3k views
   • 
   • KARNUT
   • August 29

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

   By Richard Helm, August 26
   • 1 reply
   • 374 views
   • 
   • GMCustomerService
   • August 26

7. 2020 3500 6.6 Duramax Fan stays on

   By jfatboy54, July 19
   • 2 replies
   • 473 views
   • 
   • redwngr
   • August 17

8. 2021 Transmission Shudder

   By Jacksfr, August 5
   • 2 replies
   • 482 views
   • 
   • GMCustomerService
   • August 5

9. 2022 Wheel Stud Replacement

   By Shovelca, July 22
   • 0 replies
   • 326 views
   • 
   • Shovelca
   • July 22

10. Trailer brake

    By Johnny Giesbrecht, January 28, 2020
    • 8 replies
    • 5.1k views
    • 
    • GMCustomerService
    • July 22

11. 2020 GMC AT4 Garbage Brakes! 1 2

    By SVAT4, September 28, 2020
    • 15 replies
    • 10.6k views
    • 
    • RossEGCA
    • June 24

12. 2023 2500HD,505 horsepower and 1,080 lb-ft of torque.

    By RBen, June 21
    • 0 replies
    • 1.1k views
    • 
    • RBen
    • June 21

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

    By pokismoki, March 18
    • 9 replies
    • 1.6k views
    • 
    • Diver6
    • June 17

14. Need Deleted L5P Advice 1 2

    By Brozat4, January 30, 2021
    • 26 replies
    • 25.8k views
    • 
    • Litle88
    • May 22

15. Exhaust Fumes in Cab

    By Skilpot, February 25, 2020
    • 14 replies
    • 5.3k views
    • 
    • trkpro
    • May 17

16. 220 Amp Alternator Question - 2021 Silverado 2500HD Duramax

    By tortiseshell, April 1
    • 14 replies
    • 1.9k views
    • 
    • tortiseshell
    • April 30

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

    By swaptrex14, October 30, 2020
    • 29 replies
    • 40.6k views
    • 
    • CHARLI
    • April 29

18. 3500 SRW vs DRW

    By jeffd, April 19
    • 3 replies
    • 1.6k views
    • 
    • MTU Alum
    • April 21

19. 2021 Duramax

    By Harold Desautel, January 26
    • 1 reply
    • 1.5k views
    • 
    • kmonto
    • April 18

20. sultastic spring shackles

    By anthonybehnken, December 6, 2020   

    • Rear spring shackles
    • 3 replies
    • 1.7k views
    • 
    • MTU Alum
    • March 6

21. Duramax exhaust pipe

    By Walkerman, February 21
    • 1 reply
    • 1.2k views
    • 
    • newdude
    • February 21

22. Airlift options for DRW?

    By John FX, January 19
    • 3 replies
    • 833 views
    • 
    • John FX
    • January 26

23. Dmax Plant Expansion

    By C/K Man, January 1
    • 1 reply
    • 1.2k views
    • 
    • elcamino
    • January 1

24. 2020 6.6 D-max towing MPG 1 2 3

    By Lfod1836, December 4, 2019
    • 33 replies
    • 21.2k views
    • 
    • nutdriver
    • December 31, 2021

25. Dealer oil change

    By shadow gray 2020 hd, December 16, 2021
    • 12 replies
    • 2.4k views
    • 
    • Grumpy Bear
    • December 21, 2021

26. 10 speed Allison Transmission 1 2 3

    By Double Dkar, September 1, 2019
    • 41 replies
    • 41.3k views
    • 
    • newdude
    • December 7, 2021