GM Duramax L5P - SOTF Tune Package (2017-2025)
Type: Tuners
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Unlock stronger torque, sharper throttle response, and real-world drivability gains. This L5P tuning package is designed for 2017–2025 Chevrolet Silverado and GMC Sierra 2500HD / 3500HD trucks equipped with the 6.6L Duramax. Choose between Switch-On-The-Fly (SOTF) tuning for earlier models or a refined single-calibration performance file for newer applications.
For off-road use only.
Product image is for reference. Tuner hardware appearance may vary.
This tuning solution gives you two configuration options depending on model year:
- 2017–2023: 5-Level Switch-On-The-Fly (SOTF) tuning for adjustable power control while driving.
- 2024–2025: Single-calibration performance tuning for consistent power gains with factory-style drivability.
Whether you want adjustable performance on demand or a dedicated power increase, this package is built to deliver smooth operation and strong output.
Vehicle Fitment
- 2017–2023 Chevrolet Silverado 2500HD / 3500HD – 6.6L Duramax L5P
- 2017–2023 GMC Sierra 2500HD / 3500HD – 6.6L Duramax L5P
- 2024–2025 Chevrolet Silverado 2500HD / 3500HD – 6.6L Duramax L5P
- 2024–2025 GMC Sierra 2500HD / 3500HD – 6.6L Duramax L5P
Important: 2017–2023 4500/5500 Cab & Chassis models are limited to a 60 HP file. Contact us before ordering if you have a C&C configuration.
Available Power Levels (2017–2023 SOTF Only)
| Level | Estimated HP Increase |
|---|---|
| 1 | +0 HP (Stock Optimized) |
| 2 | +50 HP |
| 3 | +75 HP |
| 4 | +100 HP |
| 5 | +150 HP |
Note: EGT monitoring is strongly recommended when operating in Levels 4 and 5.
Technical Requirements
The following components are required and sold separately unless bundled:
- GM Duramax L5P OBD2 Flash Delete Tuning Interface
- Unlocked ECM (E41)
- Tuning Credits:
- 6 Credits – 2017–2023
- 8 Credits – 2024–2025
Always include your OBD2 interface serial number when ordering credits.
What’s Included
- 5-Level SOTF Tune File (2017–2023) or
- Single-Calibration Performance Tune (2024–2025)
These calibrations are intended for stock hardware configurations with emissions equipment removed for off-road applications. Not compatible with upgraded turbochargers, larger injectors, or major fueling system modifications. Contact us prior to ordering if your truck has aftermarket performance hardware installed.
Features
- Switch-On-The-Fly capability for 2017–2023 models
- Dedicated optimized calibration for 2024–2025 models
- Improved throttle response and torque delivery
- Smooth drivability under daily and towing conditions
- Calibration built specifically to your vehicle’s VIN
Benefits
- Noticeable horsepower and torque gains
- Adjustable power levels for different driving conditions (SOTF models)
- Enhanced towing and acceleration performance
- Maintains safe operating strategies when properly installed
Additional Options
- Pair with our L5P All-In-One DPF/DEF/EGR Delete Kit for a complete off-road solution
- Unlocked E41 ECM available separately
- Additional tuning credits available upon request
- L5P installation resources available in our support section
Important Information
- Each tune is custom-built for your vehicle and is non-refundable.
- Vehicle must be free of active diagnostic trouble codes prior to tuning.
- Intended for off-road use only.
- Please review our Terms & Conditions and Shipping Policy before ordering.
Important Notes:
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TARIFF NOTICE:
While we ship with all required USMCA/CUSMA paperwork, U.S. Customs or carriers may still apply duties or fees at delivery. For details, see U.S. Customs & Border Protection
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Return Policies
Your satisfaction is important to us. If you wish to return an item or request a refund, please review the terms and conditions outlined in our Returns Policy.
Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
