GM Duramax L5P - Unlocked E41 ECM (2017-2023)
Type: Engine Control Module | Fits: GM Duramax
Take control of your Chevrolet Silverado or GMC Sierra 2500/3500 6.6L Duramax with a pre-modified, unlocked E41 ECM. This upgrade enables advanced tuning without the hassle of traditional modifications, giving you more performance and full flexibility over your truck’s engine management system.
Vehicle Fitment
✅ 2017–2023 Chevrolet Silverado 2500/3500 6.6L Duramax L5P
✅ 2017–2023 GMC Sierra 2500/3500 6.6L Duramax L5P
❌ Not compatible with non-L5P Duramax engines
Specifications
| Feature | Details |
|---|---|
| ECM Type | Pre-modified Unlocked E41 ECM |
| Compatibility | 2017, 2018–2021, 2022–2023 Silverado & Sierra Duramax L5P |
| Requirements | Immobilizer Relearn & Crank Relearn (SPS subscription or GM dealer tool required) |
| Benefit | Keep your original ECM untouched; receive a ready-to-install unlocked unit |
| Alternative Option | L5P Unlock Tool (unlocks stock ECM without swap) |
What’s Included
- Pre-modified, unlocked E41 ECM
- Year-specific compatibility options (2017, 2018–2021, 2022–2023)
Key Features
- Direct replacement ECM that’s already unlocked for tuning
- Retains your original ECM, keeping it safe and untouched
- Eliminates downtime and shipping delays
- Enables custom and performance tuning options
Benefits
- Simple, plug-and-play upgrade path for L5P tuning
- No need to ship out your original ECM
- More performance and better drivability with unlocked tuning potential
- Choice between swap ECM or the Black Bandit Unlock Tool for added flexibility
Explore More Options
Important Notes:
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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.
