GM Duramax L5P - ECM E41 Upgrade & Unlock Kit (2017-2023)
Type: Tuners | Fits: GM Duramax
Unlock your L5P ECM in just 20 minutes—no removal required.
The E41 L5P ECM Upgrade & Unlock Kit allows you to conveniently upgrade your ECM for 2017–2023 Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax trucks without removing it from the vehicle. This fast, streamlined process enables reading, writing, scanning, and full tuning through specialized software and an OBD2 Flash Delete Tuning Interface.
Designed for both professional tuners and DIY enthusiasts, this kit eliminates the risk of damaging tabs during ECM removal and avoids the need for complicated reprogramming.
Find E4 upgrade kit procedure and cable installation instructions here
Vehicle Compatibility
- 2017 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2018 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2019 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2020 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2021 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2022 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2023 Chevrolet Silverado 2500/3500 6.6L L5P Duramax
- 2017–2023 GMC Sierra 2500/3500 6.6L L5P Duramax
Specifications
| Feature | Details |
|---|---|
| Supported Years | 2017–2023 |
| Supported Vehicles | Chevy Silverado & GMC Sierra 2500/3500 6.6L L5P Duramax |
| Install Time | 20 minutes or less |
| Write Time | ~6 minutes |
| Required Tools | OBD2 Flash Delete Tuning Interface + Specialized Software |
| Relearns Needed | None (No IMMO relearn, No crank relearn, No “Replace ECM” function) |
| Functions Enabled | Full diagnostics, scanning, logging, editing, and tuning |
| Availability | US & Canada only |
Key Features
- No ECM removal required—minimizes risk of physical damage
- Fast upgrade process with simple setup
- Provides access to full diagnostics and data logging
- Enables advanced reading, writing, and tuning capabilities
- Eliminates need for immobilizer or crankshaft relearns
- Write times in as little as six minutes
Benefits
- Save time with quick installation and setup
- Unlock the full potential of your truck’s ECM safely
- Perfect for tuners and enthusiasts seeking professional-grade control
- Reliable, durable, and optimized for L5P Duramax platforms
Installation
The kit includes everything required for a hassle-free upgrade. Follow the included instructions for cable setup and software use. Average upgrade time is just 20 minutes.
Important Notes:
Hurry Up! Only 0 items left in stock!
Copy link:
Share:
Ask a question
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
Shipping
We strive to provide fast and reliable shipping options for all our customers. For detailed information about our shipping rates, delivery times, and policies, please visit our Shipping Page.
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.
