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

Technical powertrain discussion specifically for the 2020+ L5P Duramax Diesel Engine and 10-Speed Allison Transmission combination on the 2020 Chevrolet Silverado 2500 / 3500 or 2020 GMC Sierra 2500 / 3500

99 topics in this forum

  1. Emissions System Error

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    • 1 reply
    • 169 views
    • 10 replies
    • 917 views
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    • 328 views
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    • 500 views
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    • 10 replies
    • 2,208 views
    • 13 replies
    • 1,349 views
  2. Oil

    • 3 replies
    • 794 views
    • 16 replies
    • 1,369 views
  3. Regen?

    • 11 replies
    • 1,888 views
    • 1 reply
    • 568 views
  4. High Idle

    • 13 replies
    • 9,635 views
    • 11 replies
    • 1,587 views
    • 16 replies
    • 4,795 views
    • 28 replies
    • 9,182 views
  5. Engine operating temp

    • 7 replies
    • 1,035 views
  6. Silverado 2500HD Issue

    • 11 replies
    • 2,076 views
  7. Auto Grade Brake 1 2

    • 18 replies
    • 2,269 views
  8. Winter fuel for L5P

    • 3 replies
    • 1,150 views
  9. Air bags

    • 3 replies
    • 770 views


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