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

151 topics in this forum

1. Banks Derringer on 2024?

   By bass mechanic, May 22
   • 0 replies
   • 232 views
   • 
   • bass mechanic
   • May 22

3. 220 Amp Alternator Question - 2021 Silverado 2500HD Duramax 1 2

   By tortiseshell, April 1, 2022
   • 16 replies
   • 5k views
   • 
   • Terry OBrien
   • May 20

4. I try not to look at this section... 1 2

   By Jettech1, January 1
   • 17 replies
   • 2.3k views
   • 
   • kevin74
   • May 11

5. Duramax Newbie

   By waltman, May 11
   • 0 replies
   • 293 views
   • 
   • waltman
   • May 11

6. Ticking sound at idle

   By Bones454, July 4, 2020
   • 8 replies
   • 6k views
   • 
   • Hunter_s
   • May 9

7. Something locked up causing me to skit to a halt.

   By Steve Macedo, April 15
   • 7 replies
   • 853 views
   • 
   • 4x4Hank
   • April 30

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

   By XY74, December 22, 2022
   • 5 replies
   • 1.5k views
   • 
   • XY74
   • April 18

9. Lower Shutter removed

   By OldasDirt, April 16
   • 0 replies
   • 378 views
   • 
   • OldasDirt
   • April 16

10. Fuel filter change with push-button start

    By Penndel Zeke, December 19, 2020
    • 7 replies
    • 20.7k views
    • 
    • redwngr
    • April 15

11. Humming noise when cold started??

    By 2023 problem, March 16
    • 6 replies
    • 1.2k views
    • 
    • redwngr
    • April 13

12. 2020 and up, dpf system recall 1 2 3 4

    By shadow gray 2020 hd, May 25, 2022
    • 46 replies
    • 18k views
    • 
    • XY74
    • March 31

13. Anyone buy the GMC "Prepaid Mainenance" plan?

    By blamkin86, February 21
    • 3 replies
    • 1k views
    • 
    • gemarsh
    • February 23

14. Airlift options for DRW?

    By John FX, January 19, 2022
    • 4 replies
    • 1.6k views
    • 
    • Aojaguar
    • February 18

15. Winter guard

    By gemarsh, December 12, 2022
    • 7 replies
    • 1.7k views
    • 
    • TripDad
    • January 11

16. 2022 LP5 Loud Air Noise on Throttle and Bad Fuel Economy

    By aleeuw, January 3
    • 9 replies
    • 1.2k views
    • 
    • GMCustomerService
    • January 9

17. sultastic spring shackles

    By anthonybehnken, December 6, 2020   

    • Rear spring shackles
    • 8 replies
    • 2.9k views
    • 
    • asilverblazer
    • January 9

18. Need Deleted L5P Advice 1 2

    By Brozat4, January 30, 2021
    • 29 replies
    • 36.5k views
    • 
    • 2500W/T
    • January 2

19. DEF Tank - Frozen

    By ArrowsmithPML, December 20, 2022
    • 14 replies
    • 2.2k views
    • 
    • ArrowsmithPML
    • December 22, 2022

20. Aux heater

    By gemarsh, December 22, 2022
    • 3 replies
    • 931 views
    • 
    • CamGTP
    • December 22, 2022

21. 2022 Silverado 2500HD Duramax Transmission Temp High with Normal Driving, Not Towing 1 2 3

    By D Fowers, July 20, 2022
    • 34 replies
    • 6.1k views
    • 
    • Jim 2022
    • December 13, 2022

22. Chrome Wheels for 2020 Sierra HD

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

23. 2020 2500HD AT4 - 17K miles - Allison leaked and -REBUILD- 1500m from home 1 2

    By Kaamacat, October 7, 2021
    • 16 replies
    • 4k views
    • 
    • 64BAwagon
    • November 7, 2022

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

    By Richard Helm, August 26, 2022
    • 3 replies
    • 2k views
    • 
    • Richard Helm
    • November 3, 2022

25. 2020 GMC AT4 Garbage Brakes! 1 2

    By SVAT4, September 28, 2020
    • 16 replies
    • 13.7k views
    • 
    • Will Fair
    • October 11, 2022

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

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