GM E99 ECM Service (Global B) - Upgrade Only

Tune your C8 Corvette, Blackwing or Escalade-V. The Global B E99 engine computer 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?

• 2020-2024 Chevrolet Corvette C8 Stingray 6.2L (LT2), not Z06
• 2024-2025 Chevrolet Corvette E-Ray 6.2L
• 2022-2026 Cadillac CT5-V Blackwing 6.2L (LT4)
• 2022-2026 Cadillac CT4-V Blackwing 3.6L twin turbo (LF4)
• 2020-2023 Cadillac CT5-V 3.0L twin turbo (LGY)
• 2023-2026 Cadillac Escalade-V 6.2L

Have a 2019 Corvette ZR1? See GM E99 ECM Services for ZR1.

What else you'll need (sold separately)

• 8 Universal Credits to license the E99 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 8 Universal Credits and start tuning.

Ship to:
HP Tuners, LLC
ATT: GM E99 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, not a spare.
• 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.
• After reinstalling, connect with VCM Scanner and read and clear codes first.
• Once upgraded, other tuning or calibration tools can't be used on the ECM. Scan tools and dealer diagnostics keep working, and you can return to stock any time with VCM Suite.