DuramaxTuner DT116003010100A Switch on the Fly Tuning with ECM Tune, Unlock & Credits | 2020-2023 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P

Features:

• Includes ECM unlock and tuning credits
• Switch-on-the-fly between five custom tunes
• No need to reflash to change power levels
• Emissions intact—no equipment removal needed
• Custom transmission tuning for 10-speed Allison
• Includes HP Tuners MPVI3 hardware
• Sport tune adds up to 150 RWHP
• SMART EGT control built into tow tunes
• Custom pedal sensitivity for towing control
• Modified TCM hardware included with refund core
• Built for performance, towing, and daily driving
• Includes world-class tech support and guidance

The Ultimate Tuning Device for GM 6.6L Duramax L5P

If you’re ready to finally wake up your 2020–2023 L5P Duramax, the DuramaxTuner Switch-On-The-Fly Tuning Package gives you everything you need to get serious power, better drivability, and full control—all in one complete, emissions-friendly setup. This isn’t a basic plug-and-play tuner. It’s a fully custom tuning package that includes ECM unlocking, five switchable tunes, HP Tuners hardware, transmission tuning, and the credits to tie it all together. The standout feature here is true Switch-On-The-Fly tuning. Instead of plugging in a tuner every time you want to change power levels, you can flip between five custom-calibrated tunes on the fly—while driving. Whether you’re towing, commuting, or looking for max output, the right tune is always at your fingertips. Each file is built specifically for your truck and application, using over 100+ calibration changes to optimize power, throttle response, turbo behavior, and fuel efficiency.

Designed for any Build

Tunes range from Optimized Stock for troubleshooting or handing the keys to someone else, all the way up to a Sport Tune that delivers an extra 150 rear-wheel horsepower and 270 lb-ft of torque—no dead pedal, aggressive throttle response, and the kind of acceleration that puts a grin on your face. In between, you’ll find Street, Light Tow, and Heavy Tow tunes, each with its own blend of performance and reliability. Tow tunes are equipped with SMART EGT control and air-fuel ratio limits to help keep temps and soot in check while towing heavy. You’ll also receive HP Tuners’ MPVI3 hardware, giving you the ability to read, write, log, and scan your truck’s performance with professional-grade tools. The required credits are included in the package, so there’s no need to piece things together or get nickel-and-dimed along the way. The included ECM unlock service is streamlined and fast—just send in your factory ECM, and DuramaxTuner will unlock and return it ready for tuning, typically within two business days.

Transmission Tuning Included:

The package also includes full 10-speed Allison transmission tuning, which is just as important as the engine calibration. It refines shift points, improves converter lockup, boosts line pressure, and makes sure your truck holds gears when it should—whether you’re towing uphill or hammering down at wide-open throttle. A modified TCM is included and eligible for a $700 core refund once your original TCM is returned and verified. In short, this is one of the most comprehensive and proven L5P tuning solutions on the market. It’s designed by a team with over a decade of Duramax experience, built for real-world use, and backed by top-tier support.

Fits: 2020, 2021, 2022, 2023 GM 6.6L Duramax