Duramax L5P Tuning (2017–2026)

The L5P is the most powerful and technologically advanced Duramax ever produced, featuring a new turbocharger, improved fuel system, and significantly more factory power than its predecessors. It's also one of the most security-protected diesel ECMs on the market — but with the right platform, it's fully tunable for serious performance gains.

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ECM Tuning

L5P ECM tuning requires specialized tools capable of bypassing GM's security protocols. Once unlocked, the L5P responds exceptionally well to calibration changes across fueling, boost, and torque management.

• Fueling and timing optimization
• Turbo boost and response tuning
• Torque management removal
• DPF, EGR, DEF, and SCR delete tuning available
• Power, tow, and economy calibrations available

TCM Tuning

Match your ECM tune with a TCM calibration for the 10-speed automatic or Allison-equipped trucks to maximize shift quality and transmission longevity under increased torque loads.

• Shift point and pressure optimization
• Torque converter lockup tuning
• Matched to your ECM calibration for seamless drivability

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Supported Platforms

• HP Tuners — Full ECM & TCM read/write for L5P applications
• EZ Lynk AutoAgent — Cloud-based remote tune delivery

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Ready to tune your L5P? Contact us to discuss your build and get the right calibration for your truck.