What’s Included?
- LIFETIME SUPPORT & FREE RETUNES
- MPVI4 or RTD4 (optional) works with MPVI3 also
- EGR SOLUTION KIT
- Turbo Gaskets
- 3.5” Stainless Down Pipe
- Exhaust Optional
- CAN BUS Plugs ( not required but included )
- Custom Engine Tuning Single (SOTF COMING SOON) WHEN SOTF BECOMES AVALIBLE ALL CUSTOMERS WHO BOUGHT THIS COMPLETE CAREPACKAGE WILL GET FREE SOTF UPGRADE! NO IT DOES NOT MATTER HOW YOU OPTION IT!
- E42 Unlock Service Global B (optional)
- Custom engine tuning will include 0 - 200HP Options
TRANSMISSION TUNING SOLD SEPARATELY!! NOT INCLUDED WITH THIS PACKAGE
REQUIRES GLOBAL B TCM UNLOCK AND GLOBAL B TCM TUNING.
EXHAUST OPTIONS (choose one)
- 5” Full Exhaust 409 Stainless
- 4” Full Exhaust 409 Stainless
- 4” DPF Delete Pipe Only ( Race Pipe )
- 5" Full Exhaust and Polished Down Pipe 304 Stainless
E42 Unlock Service:
2024–2025 L5P ECM Unlock Service (Included in Kit)
Unlock the full tuning potential of your 2024–2025 L5P Duramax with this mail-in ECM unlock service, now available as part of our complete tuning kit. This is the required upgrade for GM’s new E42 ECM platform and is powered by HP Tuners, the industry leader in custom tuning solutions.
By unlocking your ECM now, you’ll be fully prepped for custom tuning the moment it becomes available—no delays, no waiting.
Please note: Since this is a brand-new unlock service, processing times may exceed the usual 1–3 business days. We recommend sending in your ECM early to beat the rush.
This unlock service is a core component of the full tuning package and is included with your purchase. Just mail in your ECM and we’ll handle the rest.
Note: Spare ECMs will NOT BE ACCEPTED, no exceptions. Only the original ECM from your vehicle is acceptable for this service.
ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for upgrades.
How do I get started ?
How the Process Works – Simple, Fast, and Fully Remote
Once you place your order, a member of our team will reach out within one business day (Monday–Friday) to gather your vehicle details and begin processing your order. Please note: weekends are not included in the 24-hour window.
After we receive your information, you’ll receive step-by-step instructions to ship your ECM to us for the required unlock service.
ECM unlocks typically take 1–3 business days, but due to high demand, processing times may be longer. We strongly recommend sending your ECM in as early as possible to avoid delays.
While your ECM is being unlocked, we’ll ship all hardware and components directly to your door, so you’ll be ready to go as soon as it’s returned.
Once you receive your unlocked ECM, we’ll remotely flash your tune before any parts are installed, ensuring everything is configured and ready before the teardown process begins.
To complete the tuning process, you’ll need an HP Tuners MPVI3 device. Once it arrives, simply register it online and sync your 8 Universal Credits directly from HP Tuners. These credits are required to license your VIN and the upgraded ECM in order to enable remote tuning.
After installation, you’ll receive free remote retuning support as part of our lifetime support package—that means unlimited tune revisions at no additional cost.
Everything is handled 100% remotely. All you need is a Windows laptop and a reliable Wi-Fi connection.
STEP 1 — Purchase Your Care Package
Once your order is placed, we'll email you requesting your vehicle information (VIN, modifications, transmission information, etc.) so we can build your custom tuning.
STEP 2 — Send Us Your Factory ECM
Your original factory ECM must be removed from the truck and shipped to us.
Important:
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Must be your original ECM
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Spare ECMs cannot be used
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ECM must not have broken tabs or connectors
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ECM must be fully functional before being unlocked
STEP 3 — ECM Unlock Process (2–4 Weeks)
Once we receive your ECM, it is sent out for the unlock service.
Current turnaround:
Approximately 2–4 weeks
Unfortunately this process cannot be expedited.
During this time your truck will remain down while the ECM is away for unlocking. HP Tuners' Global B support for 2024+ trucks requires an upgraded/unlocked ECM before custom tuning can be written.
STEP 4 — TCM Unlock (Required for Transmission Tuning)
If you purchase transmission tuning, your TCM must also be unlocked.
Engine tuning and transmission tuning are two separate control modules.
No unlocked TCM = No transmission tuning.
STEP 7 — Reinstall the ECM
Once your unlocked ECM arrives back:
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Install the ECM
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Reinstall the battery connections
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Verify the truck starts properly
STEP 8 — Read Your Stock File
Once you receive your unlocked ECM (and TCM, if applicable) back in the mail:
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Reinstall the modules into your truck.
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Using your HP Tuners MPVI interface, perform a stock read of your ECM (and TCM if transmission tuning was purchased).
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Email the stock read file(s) to our tuning team.
We use your stock read to verify the unlock was successful and build your custom calibration specifically for your vehicle.
Please do not flash any tuning until we have received and reviewed your stock read file(s).
STEP 5 — We Build Your Custom Files
Once your unlocked ECM (and TCM, if applicable) return:
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Your custom engine tuning is built
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Your transmission tuning is built (if purchased)
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Your tuning files are assigned to your truck
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Everything is prepared for installation
STEP 9 — Flash Your Custom Tuning
Using your HP Tuners interface, you'll flash your custom calibration onto the unlocked ECM.
If you purchased transmission tuning, you'll also flash the TCM calibration after the TCM has been unlocked.
STEP 6 — Install Your Parts
DO NOT INSTALL PARTS UNTIL TUNING IS COMPLETED
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Exhaust
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Downpipe
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EGR components
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Turbo gaskets
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Other selected upgrades
STEP 10 — Enjoy Lifetime Support
Every JAT Care Package includes:
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Lifetime engine tuning updates
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Revision support
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Future tune changes (within your package)
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Technical support whenever you need it
Frequently Asked Questions
Can I keep driving my truck while the ECM is being unlocked?
No. Your factory ECM must be removed, so the truck will be down during the unlock process.
Can the unlock be rushed?
No. The unlock service currently takes approximately 2–4 weeks and cannot be expedited.
Do I need the TCM unlocked?
Only if you purchased transmission tuning. Engine tuning and transmission tuning are separate systems.
Why does it take so long?
The 2024+ Duramax uses GM's newer Global B architecture, which requires the factory ECM to go through a specialized unlock process before custom calibrations can be written.