GM E46 ECM Service (3.0L Duramax LM2) - Upgrade Only

Open up the 3.0L Duramax for custom tuning. The E46 engine computer in 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks with the 3.0L Duramax (LM2) can't be tuned as delivered from the factory. This one-time HP Tuners send-in service upgrades your truck's original ECM so it can be read, edited and flashed through the OBDII port with VCM Editor.

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

Will it work on my truck?

• Covered: 2020-2022 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 3.0L Duramax (LM2) and the E46 ECM.
• Pre-refresh (non-Global B) trucks only. Refreshed "facelift" trucks use a different Global B controller and are not covered here. See the GM E66 ECM Service (Global B) instead.
• The Chevrolet Suburban LM2 is not supported by this service at this time.

What the upgrade does

• Upgrades your original E46 ECM for full calibration access in VCM Editor, with reads and writes done through the OBDII port afterward.
• No immobilizer relearn, no crank relearn and no "Replace ECM" procedure, as long as the ECM goes back into the same truck it came out of.
• VCM Scanner, dealer diagnostics and other scan tools keep working normally.
• You can return to the stock calibration, or update to the latest stock calibration, any time with VCM Suite.

What else you'll need (sold separately)

• 6 Universal Credits to license the E46 ECM once it's back in the truck. Get credits here.
• An HP Tuners MPVI2, MPVI2+, MPVI3 or MPVI4 interface.
• The latest VCM Suite BETA software (free download from HP Tuners).
• Want transmission tuning too? These trucks use the T93 TCM. HP Tuners now upgrades it through the OBDII port at no charge, so there's nothing to send in. It just takes 4 more Universal Credits to license.

How it works

1. Confirm your truck is covered (above) and place your order.
2. After checkout you'll receive the HP Tuners shipping form and the order number to reference on your package.
3. Remove the ECM from your truck and pack it carefully, with the completed shipping form inside the box.
4. Write your order number on the outside of the box where it's easy to see.
5. Ship the ECM to HP Tuners using any carrier you like. Shipping to HP Tuners is the customer's responsibility.
6. HP Tuners upgrades the ECM and ships it back to you.
7. Reinstall the ECM, license it with 6 Universal Credits and start tuning.

Ship to:
HP Tuners, LLC
ATT: E46 ECM Service
[Your order number]
711 Dartmouth Lane
Buffalo Grove, IL 60089

Wait for our email before you ship. After your purchase, our team emails you the order number and the HP Tuners shipping form. Please don't send your ECM until you have both.

Processing time at HP Tuners does not include shipping time in either direction.

Before you ship: important

• Your ECM must be fully functional, with no physical or internal damage. ECMs with broken tabs or connectors will not be accepted.
• This service upgrades your truck's original ECM for tuning. It does not reprogram an ECM for a different VIN. A spare E46 sent in for upgrade comes back with the same programming it arrived with and may need dealer programming before it will run your truck.
• Once upgraded, the E46 can't be used with other aftermarket tuning or calibration tools. Dealer reflash tools are not affected.

Questions on fitment before you pull your ECM? Text or email us first. We're happy to check your truck.