The Next Gen of L5P Diesel Tuning Starts Here!
Black Bandit now offers custom tuning and diagnostics for the newest generation of L5P Duramax trucks — powered by HP Tuners’ exclusive support for the E41 ECM.
Black Bandit’s custom Power Tunes for 2017–2023 Duramax 2500/3500 squeezes out every ounce of horsepower and torque while improving throttle response and fuel efficiency. Built exclusively for the 2017-23 6.6L L5P, these tunes break factory limits for a harder pull, smoother drive, and that aggressive edge your diesel deserves.
More Power. Sharper Response. Zero Compromise.
Your diesel has more to give — and Black Bandit Power Tunes are built to unlock every ounce of it. Developed by hardcore diesel enthusiasts, our custom tuning squeezes out raw horsepower, cranks up torque, and delivers throttle response so sharp it feels like your truck’s reading your mind.
These aren’t cookie-cutter tunes. Every Power Tune is built for your exact engine, driving style, and performance goals — whether you want to tow heavier, run quicker, or just smoke the guy next to you at the light.
What You Get with Power Tunes:
More horsepower & torque for serious pulling power
Crisper throttle response for a more responsive drive
Optimized fuel mapping for better efficiency
Custom-built for your truck—not generic, one-size-fits-all tunes
Aggressive edge that makes your 6.6L sound and feel alive
These aren’t off-the-shelf tunes. They’re built by diesel enthusiasts for diesel enthusiasts—crafted to give your 2017-2023 GMC 6.6L Duramax L5P the performance it deserves.
Stop leaving power on the table. Upgrade to Black Bandit Power Tunes and feel the difference every time you hit the throttle.
How It Works
To enable custom tuning, you’ll need to complete a one-time ECM unlock. This requires sending your truck’s original E41 ECM to HP Tuners for the upgrade. Spare or replacement ECMs will not be accepted — no exceptions.
Send in your factory E41 ECM
Processing takes 3–5 business days (plus shipping time)
Once returned, you’re ready to tune with HP Tuners’ VCM Suite
Whether you're after power, fuel efficiency, or better towing performance — this is the first step toward unlocking the full potential of your 2017-2023 Duramax L5P.
Duramax L5P 6.6L - Power Tunes (2017-2023)
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2017–2023 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
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2017–2023 GMC Sierra 2500/3500 6.6L L5P Duramax
NOTE:
If you drive a 2024+ L5P E42 model, you’ll need the GM E42 ECM Service, not this one. This service is only compatible with 2017–2023 models equipped with the E41 ECM.
If you drive a 2022 LM2 E46 model, please note that this unlock service is only for the E41 ECM found in 2017-23 models — not the E66 ECM found in later models of the 2022s.
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