3.0L Duramax LM2 Power Tuning Package | Optional OBD2 Tuner & Credits | Chevy & GMC | 2020–2022
Type: Tuners
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Choose JS Speed Diesel tuning for your 2020–2022 Chevrolet Silverado 1500 or GMC Sierra 1500 with the 3.0L Duramax LM2. Select the tune level you need, then choose whether to add the OBD2 tuning interface and credits.
Vehicle fitment
- 2020–2022 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 3.0L Duramax LM2.
- A compatible E46 ECM must be unlocked before tuning.
- Not compatible with E66 ECM or Global B vehicles, including affected late-2022 models.
Choose your package
| Option | What you receive |
|---|---|
| Yes add an OBD2 + credits | Your selected tuning files, OBD2 flash tuning interface and six tuning credits. |
| No do not add an OBD2 | Your selected tuning files. Use your own compatible interface and arrange any required licensing credits separately. |
Tune levels
| Selection | Power level |
|---|---|
| Stock Optimized | +0HP |
| Tow | +20HP |
| Street | +40HP |
| All Tune Levels | All three tuning files; not switch-on-the-fly tuning. |
Before installation
- Confirm the ECM type and complete the required unlock service before flashing.
- Provide the vehicle information and stock read needed to prepare the calibration.
- Follow the supplied interface and tuning instructions.
Read the OBD2 flash tuning interface instructions.
Frequently asked questions
Does every option include a physical tuner?
No. Select Yes add an OBD2 + credits if you need the interface and six credits.
Can I change tune levels while driving?
No. All Tune Levels supplies separate files rather than switch-on-the-fly operation.
Is ECM unlocking included?
The ECM must already be unlocked before tuning. Arrange the required unlock service separately.
For off-road or competition use only where permitted. Follow the supplied installation and tuning instructions.
Important Notes:
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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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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.
3.0L Duramax LM2 Power Tuning Package | Optional OBD2 Tuner & Credits | Chevy & GMC | 2020–2022
Vehicle Fitment
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