Description
2004 GMC Sierra 6.6L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2004 GMC Sierra 6.6L models.
Each unit is VIN-programmed, updated, and fully tested.Built to OEM standards for reliability, calibration accuracy, and long-term performance.
Strict Testing & Quality Assurance
This is not a brand-new unit. It is a rebuilt unit that is inspected, refreshed, and fully tested before shipping.
Testing includes communication, CAN-bus, sensor signal, power circuit, flash memory, and reliability checks.
Important Note
If your vehicle does not have an IMMO or PATS system, this unit will be directly plug&play.
If your vehicle has an IMMO or PATS system, it will require a key relearn after installation. You can visit your local locksmith for help.
We also offer a full cloning service. We transfer all security data to the replacement unit, so it will be a plug&play installation.
For all European cars, Hyundai, and Kia vehicles, we recommend adding our cloning service as a bundle.
For American and Japanese cars, we recommend doing a key relearn on-site.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Luke Perez –
Shipping was quick and the unit was truly plug-and-play. Installing this ECM saved me a bundle versus dealer prices and everything worked perfectly right out of the box.
Matthew Stewart –
I was impressed by how quickly the ECM arrived after placing my order, and it was truly plug-and-play—no complicated setup needed. The VIN programming was spot on, and installation went smoothly without any hiccups. This saved me a significant amount compared to dealer prices, plus their communication throughout the process was clear and professional. Overall, a great experience that I would recommend to anyone needing a replacement for their GMC Sierra.
Michael Payne –
I was really impressed with how quickly this ECM arrived—shipping was surprisingly fast. The unit was completely plug-and-play, which made installation straightforward and hassle-free. After comparing prices, I realized how much money I saved by ordering this instead of going through the dealer. The staff kept me updated throughout the process, which gave me confidence in what I was buying. Overall, it was a smooth experience, and my 2004 GMC Sierra is running great again thanks to this ECU. I would definitely recommend this to anyone in need of a reliable replacement.
Kevin Wallace –
The ECM arrived quickly with free shipping and was already programmed to my VIN, making installation a breeze. Excellent service and fast turnaround!