2019 - 2023 L5D Duramax 4500 5500 6500 | HP Tuners

Get more out of your 2019–2023 L5D Duramax 4500, 5500, or 6500 with custom tuning from Torque Works Diesel. 

Built for the demands of GM's heavy-duty commercial platform, our L5D calibrations are designed to deliver increased horsepower and torque, improved drivability, and optimized performance whether your truck spends its time towing, hauling, working, or covering serious miles.

With power levels ranging from stock to +120HP, Torque Works Diesel tuning gives you the flexibility to choose a calibration that matches the job. Heavy-tow options provide additional usable power while keeping towing demands in mind, while higher horsepower levels are available for customers looking to get more performance from the L5D platform.

For even greater flexibility, switchable tuning from 10–120HP allows you to change power levels directly through the factory steering wheel controls. Each setting utilizes its own set of tuning maps, giving you true on-the-fly tune selection without adding an external switch.

Fits

• L5D Duramax 4500/5500/6500
  • 2019 / 2020 / 2021 / 2022 / 2023
  • Pickup and Cab Chassis / Incomplete Trucks

ECM / TCM Unlock Information

No unlock tool required anymore

The Benefits of Tuning

• Increased horsepower
• Increased torque
• Potential improvement in fuel economy
• Improved towing performance
• Customized drivability

Tuning Info

Power Levels

• Stock Power
• 10HP (Heavy Tow)
• 30HP (Heavy Tow)
• 50HP (Can tow 12k lbs and under)
• 80HP
• 120HP

Switchable Tuning Power Levels:

Allows you to select between multiple predetermined power levels without reflashing the truck.

• 10-120HP

How to Change Power Levels

DSP5 tunes are based off steering wheel controls. This is true switchable tuning where each tune setting has it's own sets of maps.

• To change positions, simply hold down the cruise cancel button for a few seconds and push up (resume/increase speed) on the cruise to go up in tune levels, down to go down. The glow plug indicator light will blink the amount of times for the tune level you are in.

How Does This Work?

1. Order your device, tuning package, and required parts.
2. Complete the Tune Order Form with your truck specifications and modifications.
3. We ship your device within 48 business hours.
4. Connect your device and send us the required stock readout. Instructions are provided.
5. Our calibrators write your custom tune files.
6. Your files are sent within 24-48 business hours after we receive all required information.
7. Follow the provided instructions to flash your truck and complete installation.

Our technicians are available for phone and technical support if assistance is needed during installation.

What You'll Need

For a 2019-2023 L5D tune, you’ll need:

• Device: MPVI2 with 6 credits
• Tune Package

The device is used to flash your custom tune file into the truck, while the required hardware addresses the applicable factory systems.

After purchase, tunes are typically completed within 24-48 business hours from the time you have purchased, submit stock read out [if needed], and submit the tune order form..

Devices typically ship within 48 business hours, after we have received all required vehicle information, submitted tune order form, and stock readout files.

Instructions are provided based on your specific package.

Software Downloads & Instructions

Please ensure you understand and comply with all applicable laws and regulations in your local jurisdiction before purchasing or installing this product.

Why Use Torque Works Diesel?

✅ In-house custom calibrations tailored to your truck and intended use
✅ Data-log support and revisions for drivability, reliability, and performance
✅ Financing available to make upgrades more manageable
✅ After-purchase support
✅ Detailed installation and flashing instructions
✅ Technical support included

At Torque Works Diesel, our tunes are custom written in-house.

You’re not receiving a generic third-party calibration used on every truck.

Built, tested, and refined in-house.

Financing

Financing options are available to make your upgrades easier.

Financing Page

See Our Customers

Check out trucks tuned by Torque Works Diesel:

Tuned by TWD Customer Page

Questions?

FAQs

Email Us: Support@TorqueWorksDiesel.com