6.6L Duramax Diesel (L5P)

205 topics in this forum

1. Free DEF from Dealer

   By CMillSilverado, May 10, 2021
   • 2 replies
   • 3.3k views
   • 
   • 20L8TSierra24
   • May 13, 2021

2. Emissions System Error

   By H.B. Shannon, April 20, 2021
   • 4 replies
   • 45.1k views
   • 
   • nick112288
   • May 11, 2021

3. Hot plastic smell

   By BLV, April 23, 2021
   • 3 replies
   • 7.3k views
   • 
   • BLV
   • April 28, 2021

4. Tires rotation and tpms issues

   By Newduramaxh*ar, April 15, 2021
   • 1 reply
   • 1.8k views
   • 
   • redwngr
   • April 15, 2021

5. Problem with intel beam not working

   By BenJG, March 15, 2021
   • 9 replies
   • 3.4k views
   • 
   • RugbyRef
   • March 16, 2021

6. Exhaust brake or lack there of... need others opinion on this?

   By firedab, March 11, 2020
   • 13 replies
   • 25.4k views
   • 
   • Wyoming 3500
   • March 12, 2021

7. 2021 DMAX - cold temp issues?

   By ArrowsmithPML, February 12, 2021
   • 13 replies
   • 5.8k views
   • 
   • redwngr
   • February 26, 2021

8. Oil

   By mostcorey95, February 16, 2021
   • 3 replies
   • 5.8k views
   • 
   • Grumpy Bear
   • February 20, 2021

9. 2021 DMAX - cold temp issues? 1 2

   By ArrowsmithPML, February 10, 2021
   • 16 replies
   • 13k views
   • 
   • ArrowsmithPML
   • February 16, 2021

10. Regen?

    By Njmurvin, September 9, 2020
    • 11 replies
    • 35.3k views
    • 
    • ahartzell2020
    • February 14, 2021

11. 2020 Duramax Cold start tick

    By combat1500, February 10, 2021
    • 1 reply
    • 3k views
    • 
    • Colossus
    • February 12, 2021

12. Allison transmission fluid

    By Bones454, May 12, 2020
    • 3 replies
    • 18.9k views
    • 
    • VBS
    • February 12, 2021

13. Barney

    By Barney, February 10, 2021
    • 0 replies
    • 491 views
    • 
    • Barney
    • February 10, 2021

14. 2020 GMC 3500 SINGLE AXLE AT4 CREW 1 2

    By jojo ma, May 31, 2020   

    • AT4
    • 3500
    • (and 2 more)

      Tagged with:

      • AT4
      • 3500
      • BATTERY
      • adaptive cruise control
    • 16 replies
    • 12.1k views
    • 
    • rauan
    • January 27, 2021

15. Engine operating temp

    By Jfg1300, December 21, 2020
    • 7 replies
    • 2.9k views
    • 
    • Keith_Schumaker
    • January 24, 2021

16. Silverado 2500HD Issue

    By TFern, December 18, 2020
    • 11 replies
    • 4.4k views
    • 
    • u3putt
    • January 15, 2021

17. Auto Grade Brake 1 2

    By JRSPerf., November 14, 2020
    • 18 replies
    • 4.6k views
    • 
    • CAMPINGCPL
    • January 14, 2021

18. Winter fuel for L5P

    By COB II, December 21, 2020
    • 3 replies
    • 6k views
    • 
    • u3putt
    • January 8, 2021

19. Air bags

    By inquenciocha, December 28, 2020
    • 3 replies
    • 2.4k views
    • 
    • rblanch
    • January 7, 2021

20. Retractable Tonneau - who has used them in snowy climates?

    By SpeedyD, December 30, 2020
    • 2 replies
    • 2k views
    • 
    • redwngr
    • January 6, 2021

21. Dual battery/alternator configuration?

    By Hank B, December 27, 2020
    • 2 replies
    • 6.1k views
    • 
    • Hank B
    • December 28, 2020

22. Extended parking idle power off

    By CoalRoller, November 18, 2020
    • 2 replies
    • 8.2k views
    • 
    • Mi99z71
    • December 27, 2020

23. Where do I add trans fluid in 2020 2500 hd

    By Terra Platt, October 28, 2019   

    • Trans fluid
    • 14 replies
    • 51.1k views
    • 
    • mostcorey95
    • December 13, 2020

24. Break in period 1 2

    By Foldbak, December 6, 2020
    • 15 replies
    • 14.9k views
    • 
    • Grumpy Bear
    • December 13, 2020

25. 2020 GMC 3500 Denali

    By milosusa, November 17, 2020   

    • rear differential
    • 2 replies
    • 4.8k views
    • 
    • redwngr
    • November 26, 2020