6.6L Duramax Diesel (L5P)

205 topics in this forum

1. Need Deleted L5P Advice 1 2 3

   By Brozat4, January 30, 2021
   • 36 replies
   • 91.2k views
   • 
   • PBNB
   • Wednesday at 07:30 PM

2. Exhaust heat while towing!

   By PBNB, June 20
   • 1 reply
   • 299 views
   • 
   • GMCustomerService
   • July 9

3. is Boost tube loose?

   By MG386, March 30
   • 1 reply
   • 408 views
   • 
   • PBNB
   • May 13

4. L5P Android Auto Gauge app

   By mkirkland, March 26
   • 6 replies
   • 828 views
   • 
   • mkirkland
   • April 25

5. What is this light called?

   By Bob 5th Wheel, April 2
   • 3 replies
   • 709 views
   • 
   • carkhz316
   • April 5

6. Towing a 5th Wheel

   By DBeau, March 30   

   • towing
   • 5th wheel
   • (and 1 more)

     Tagged with:

     • towing
     • 5th wheel
     • lifted truck
   • 4 replies
   • 846 views
   • 
   • tonto340
   • April 1

7. Fuel filter change with push-button start

   By Penndel Zeke, December 19, 2020
   • 8 replies
   • 84.4k views
   • 
   • JJJR
   • March 22

8. Momentary rear wheel lockup recall

   By XY74, November 11, 2024
   • 10 replies
   • 9k views
   • 
   • Zane
   • March 6

9. Frame repair

   By MHP275, February 2
   • 4 replies
   • 624 views
   • 
   • newdude
   • March 3

10. Transmission Control Valve Recall

    By Whip, December 27, 2024
    • 9 replies
    • 13.1k views
    • 
    • Courtney Johnson
    • February 22

11. 2025 GMC Sierra 2500 6.6L Duramax Transmission Leak 1 2

    By Jrod.Milton, October 22, 2024
    • 24 replies
    • 24.2k views
    • 
    • vscott
    • February 20

12. Recent Recall

    By RCTaylor, January 16, 2025
    • 5 replies
    • 3.6k views
    • 
    • RCTaylor
    • February 4

13. Engine temp

    By Ultlukasz, December 15, 2025
    • 1 reply
    • 260 views
    • 
    • MG386
    • February 3

14. diesel fuel additives 1 2

    By tc64, September 16, 2020
    • 27 replies
    • 20.9k views
    • 
    • Rick_
    • November 2, 2025

15. 11 quarts to fill my truck after oil change 1 2

    By 64BAwagon, May 20, 2025
    • 23 replies
    • 21k views
    • 
    • Z45
    • October 28, 2025

16. Banks Derringer on 2024? 1 2 3 4 5

    By bass mechanic, May 22, 2023
    • 74 replies
    • 46.8k views
    • 
    • mcredi
    • September 4, 2025

17. 2025 8.3L Duramax 1 2

    By C/K Man, January 31, 2024
    • 19 replies
    • 7.7k views
    • 
    • bruceb58
    • August 23, 2025

18. P20B9 DEF Heater Failure, workaround for limp mode?

    By Michael Butts, April 13, 2025
    • 7 replies
    • 4.2k views
    • 
    • mjm-1957
    • July 19, 2025

19. Loud humming noise when idling in cold temps

    By Taylor_S, March 21, 2025
    • 8 replies
    • 2.1k views
    • 
    • Sonny R
    • June 25, 2025

20. Aftermarket DEF filter?

    By RNAV, May 29, 2025
    • 2 replies
    • 1.5k views
    • 
    • redwngr
    • June 8, 2025

21. DEF fuse

    By Outdoorsmen22, March 13, 2025
    • 2 replies
    • 3.3k views
    • 
    • Outdoorsmen22
    • March 13, 2025

22. 2022 LP5 Loud Air Noise on Throttle and Bad Fuel Economy

    By aleeuw, January 3, 2023
    • 12 replies
    • 11.3k views
    • 
    • GMCustomerService
    • March 10, 2025

23. 3500 Duramax engine brake not working & throttle sticking

    By owner, March 4, 2025
    • 3 replies
    • 3k views
    • 
    • GMCustomerService
    • March 10, 2025

24. problems with recall???

    By buelldude, February 24, 2025
    • 2 replies
    • 2.3k views
    • 
    • Chevyfan3
    • February 25, 2025

25. Another valve body bites the dust. Anyone know how long the wait is now?

    By fishnitro, February 3, 2025
    • 7 replies
    • 6.4k views
    • 
    • fishnitro
    • February 20, 2025