6.6L (LML/L5P) & 6.0L (L96/LC8) Tech

225 topics in this forum

1. 2019 2500HD trans issue ( wheels spinning while trying to stop!)

   By 2019 Red, September 24
   • 0 replies
   • 190 views
   • 
   • 2019 Red
   • September 24

3. Trailer disconnected connected on dash 1 2

   By cmysstailights, July 18, 2018
   • 15 replies
   • 22.3k views
   • 
   • hellswrath7
   • August 9

4. 2018 L5P codes. P129F & P228C

   By Danny R, November 27, 2020
   • 11 replies
   • 28.9k views
   • 
   • Bdock1981
   • May 19

5. No power all the sudden .parked went inside came out and nothing no dash no crank nothing dead completely 9

   By Delaney Kerr, January 16
   • 0 replies
   • 1k views
   • 
   • Delaney Kerr
   • January 16

6. two chimes vs one chime when I turn on ignition

   By Reggie Belanger, January 3   

   • 2019 Sierra 2500HD Duramax
   • 0 replies
   • 653 views
   • 
   • Reggie Belanger
   • January 3

7. MAP Sensor cage.

   By BNSF, April 1, 2023
   • 1 reply
   • 2.6k views
   • 
   • foamy
   • September 7, 2023

8. Worth buying high mileage trucks?

   By Katkinson1112, May 1, 2022
   • 12 replies
   • 12.7k views
   • 
   • white bread
   • August 15, 2023

9. Shifting issues

   By jacob keese, June 29, 2023
   • 0 replies
   • 1.3k views
   • 
   • jacob keese
   • June 29, 2023

10. No lights L5P back to shop

    By Jackie Emery Andrus, June 19, 2023   

    • Warranty
    • l5p
    • (and 2 more)

      Tagged with:

      • Warranty
      • l5p
      • mirrors
      • Emission System Error Code
    • 0 replies
    • 1.4k views
    • 
    • Jackie Emery Andrus
    • June 19, 2023

11. Manual shifting not working

    By Ryan Fischer, May 29, 2023
    • 0 replies
    • 1.6k views
    • 
    • Ryan Fischer
    • May 29, 2023

12. Turns over but won't start without ether

    By kbm0084, November 6, 2017   

    • issues
    • wont start
    • (and 3 more)

      Tagged with:

      • issues
      • wont start
      • ether
      • 3500
      • gmc
    • 9 replies
    • 17.1k views
    • 
    • GMCustomerService
    • April 13, 2023

13. wont start without ether please help

    By TRAVOSE20, April 11, 2023
    • 0 replies
    • 1.6k views
    • 
    • TRAVOSE20
    • April 11, 2023

14. coils and wires

    By dynoray, March 16, 2023
    • 0 replies
    • 2k views
    • 
    • dynoray
    • March 16, 2023

15. 6.0 pulling timing at 3000 RPM 1 2

    By Abarth500., June 3, 2018   

    • 6.0
    • vortec
    • (and 4 more)

      Tagged with:

      • 6.0
      • vortec
      • knock retard
      • pulling timing
      • 3000
      • rpm
    • 18 replies
    • 16.3k views
    • 
    • Zackdarden5
    • September 26, 2022

16. Buyer beware, CNG

    By CNGTruck, July 21, 2022
    • 4 replies
    • 3k views
    • 
    • newdude
    • September 14, 2022

17. Fuel gauge sticking.

    By Mike Hamm, September 1, 2022
    • 0 replies
    • 2.2k views
    • 
    • Mike Hamm
    • September 1, 2022

18. 2015 GMC Sierra 3500HD SRW rear caliper torque spec

    By Matt Ziprick, August 15, 2022
    • 4 replies
    • 6.6k views
    • 
    • Tyler Gibbs
    • August 17, 2022

19. 2017 Duramax Recommends Using Only GM DEF to Avoid Problems 1 2

    By jimstringer, August 11, 2017   

    • def quality problem
    • 22 replies
    • 70.9k views
    • 
    • John Gillette
    • August 13, 2022

20. Glow plug that is haunted lol

    By topdj, April 2, 2022
    • 0 replies
    • 2.6k views
    • 
    • topdj
    • April 2, 2022

21. DEF heater failure and engine light 1 2

    By Jnich17, November 10, 2017   

    • 2015 duramax
    • 28 replies
    • 82.3k views
    • 
    • JLP01
    • March 16, 2022

22. start engine to view application

    By LabOne, March 5, 2022
    • 0 replies
    • 2.4k views
    • 
    • LabOne
    • March 5, 2022

23. '17 2500hd 6.0L Long Tube Headers? 1 2

    By Biggerdogg01, January 5, 2019
    • 23 replies
    • 19.6k views
    • 
    • pokismoki
    • January 28, 2022

24. Cam Swap 2015 6.0 1 2

    By JesseJames94, October 6, 2017
    • 21 replies
    • 35.3k views
    • 
    • shakenfake
    • January 27, 2022

25. Service theft deterrent system

    By Trevo-all, November 6, 2021
    • 0 replies
    • 4.4k views
    • 
    • Trevo-all
    • November 6, 2021

26. The great debate…. L5P oil

    By MichDirtyMax19, November 3, 2021
    • 6 replies
    • 5.6k views
    • 
    • Grumpy Bear
    • November 4, 2021