GM E66 ECM Service (Global B) - Upgrade Only

Tune the Global B 3.0L Duramax. The E66 engine computer in 2021 and newer GM trucks and SUVs with the 3.0L Duramax (LM2 and LZ0) has to be upgraded before it can be tuned. This one-time HP Tuners send-in service upgrades your original ECM so you can calibrate, data log and flash through the OBDII port.

This is a send-in service. Your ECM has to come out of the vehicle and ship to HP Tuners, so the vehicle will be down while it's away. Please read this whole page before ordering.

Will it work on my vehicle?

• 2022-2022.5 Chevrolet Silverado 1500 / GMC Sierra 1500 3.0L Duramax LM2 (Global B)
• 2022-2025 Chevrolet Silverado 1500 / GMC Sierra 1500 3.0L Duramax LZ0
• 2021-2023 Chevrolet Tahoe and Suburban 3.0L Duramax LM2
• 2021-2023 GMC Yukon 3.0L Duramax LM2
• 2021-2023 Cadillac Escalade 3.0L Duramax LM2

Have a 2020-2022 pre-refresh Silverado or Sierra 1500 with the LM2? That truck uses the E46 ECM. See the GM E46 ECM Service.

What else you'll need (sold separately)

• 6 Universal Credits to license the E66 ECM.
• An HP Tuners MPVI3 or MPVI4. Global B vehicles do not work with the MPVI2 or MPVI2+.
• The latest VCM Suite BETA software (free from HP Tuners).
• Transmission tuning on 10-speed models needs the GM T93 TCM Service (Global B).

How it works

1. Confirm your vehicle is covered and place your order.
2. Our team emails you the order number and the HP Tuners shipping form.
3. Remove the ECM, pack it carefully with the completed form inside, and write the order number on the outside of the box.
4. Ship it to HP Tuners with any carrier. Shipping to HP Tuners is the customer's responsibility; the shipping charged at checkout covers the return trip.
5. HP Tuners upgrades the ECM and ships it back.
6. Reinstall it, license it with 6 Universal Credits and start tuning.

Ship to:
HP Tuners, LLC
ATT: GM E66 ECM Service (Global B)
[Your order number]
711 Dartmouth Lane
Buffalo Grove, IL 60089

Wait for our email before you ship. Please don't send your ECM until you have the order number and shipping form.

Before you ship: important

• Send the original ECM from your vehicle.
• Do not install and relearn a spare ECM while yours is away. If you do, your upgraded original will no longer work in the vehicle.
• No immobilizer relearn, crank relearn or "Replace ECM" procedure is needed as long as the ECM goes back into the same vehicle.
• Once upgraded, no other tuning or calibration tools can be used on the ECM, including dealer reflash tools. Scan tools and dealer diagnostics keep working, and you can return to stock any time with VCM Suite.