NWT 2017-2023 GM 6.6L L5P Duramax ECM Tuning

Unlock the full potential of your 2017–2023 GM 6.6L L5P Duramax with custom ECM tuning. Purpose-built for the L5P platform, our tunes are calibrated to maximize power, torque, and drivability while keeping your truck reliable for daily driving or towing.

Tune Options

• Single Tune — One custom tune loaded directly to your ECM. Optimized for your specific build and mods.
• Shift on the Fly (SOTF) — Multiple power levels switchable on the fly from the cab. Choose your power level based on load, conditions, or how much fun you’re having.

ECM Credits

ECM tuning requires 4 credits. Select whether you need credits included with your tune or already have them.

• Credits Included — 4 ECM credits included with your tune purchase.
• Credits Not Included — You already have credits on file.

TCM Tuning

Looking to add transmission tuning? TCM tuning is available as a separate add-on product and requires 4 credits. A custom TCM tune optimizes shift points, firmness, and torque management to match your new ECM power levels.

Key Benefits

• Increased horsepower and torque across the RPM range
• Improved throttle response and drivability
• Optimized fueling and timing for your build
• Tow tune options available
• Pair with our L5P TCM Tuning for a full powertrain calibration

Fitment

• 2017–2023 GM 6.6L L5P Duramax
• Silverado HD / Sierra HD