6.6L Duramax L5P Delete Tune Files | Chevy & GMC | 2017–2025
Type: Tuners
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These JS Speed Diesel calibration files are selected by L5P model year: a five-level SOTF file for the earlier platform, or a single-calibration file for the later platform.
Vehicle fitment
- 2017–2023 L5P: select Switch On The Fly.
- 2024–2025 L5P: select Single Calibration.
- Chevrolet Silverado and GMC Sierra 2500HD/3500HD pickups with 6.6L Duramax L5P.
Specifications
| Specification | Details |
|---|---|
| 2017–2023 SOTF levels | Stock, +50, +75, +100 and +150 HP |
| 2024–2025 selection | One calibration; not SOTF |
| Credits required | Supplier specifies 6 for 2017–2023; 8 for 2024–2025 |
| Hardware | Compatible interface and unlocked ECM required separately |
What is included
- The selected vehicle-specific digital ECM tune file
Before installation
- Use the file matched to your exact vehicle and selected tuning option.
- Interface, ECM unlock and required credits are prerequisites, not included hardware in this file-only listing.
- Contact JS Speed Diesel about upgraded turbochargers, injectors or major fueling changes before choosing these files.
- Monitor exhaust temperatures at higher power levels.
For off-road or competition use only where permitted. Follow the supplied installation and tuning instructions.
Frequently asked questions
Does this purchase include an interface?
No. This listing is for the selected digital calibration file.
Are the later-year tunes switchable?
No. The 2024–2025 option is a single calibration.
Can I use these files with larger injectors or an upgraded turbo?
The stated files are for stock hardware with the supported emissions configuration. Modified fueling or turbo hardware requires a different calibration assessment.
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.
6.6L Duramax L5P Delete Tune Files | Chevy & GMC | 2017–2025
Vehicle Fitment
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