Description
2004 Chevrolet Silverado 6.6L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2004 Chevrolet Silverado 6.6L models.
Each unit is VIN-programmed, updated, and fully tested for a true plug-and-play installation with our cloning service.
Built to OEM standards for reliability, calibration accuracy, and long-term performance.
Strict Testing & Quality Assurance
Every ECU is inspected, refreshed, and verified through advanced diagnostic tools. Testing includes:
Complete communication & CAN-bus verification
Sensor input/output and signal integrity checks
Injector & ignition pulse simulation
Power, ground, and load-circuit analysis
Flash memory integrity and checksum validation
Thermal and voltage-stress testing to confirm reliability
Important Note
Some vehicles with IMMO or PATS require key programming after installation. This is normal.
For a 100% plug-and-play solution, we recommend using our full cloning service. We transfer all security data to the replacement unit.
A prepaid shipping label will be emailed to you. Allow you to mail in your original computer to us for full cloning.
If cloning is not selected, the ECU will be VIN programmed, and a key relearn will be required after installation.
Contact Us
Email: info@fixecm.com
Phone: Local: 647-247-8555 | Toll-Free: 1-800-915-5566
Spencer Edwards –
The ECM arrived quickly with free shipping and was perfectly programmed for my Silverado—installation was a breeze.
Elijah Nelson –
I was really impressed with the service when I ordered the ECM for my 2004 Silverado. From the start, the team answered all my questions promptly, which made me feel confident about the purchase. The unit arrived faster than I expected, and since it was VIN programmed, the installation was completely plug-and-play with no headaches. After swapping it in, my truck started right up and runs like new again. The reasonable shipping cost was a nice bonus on top of their professional setup. Overall, a smooth experience from start to finish.
Kevin Hamilton –
I was really impressed with the service I received when ordering this ECM for my 2004 Silverado. The unit arrived quickly and was already VIN programmed, so installation was straightforward with no extra hassle on my part. The team was great at answering my questions before the purchase, which gave me confidence in what I was getting. Shipping was free and fast, which made the whole process even better. Since installing it, my truck has been running smoother than ever. I’ll definitely buy from them again if I ever need another module.
Andrew Morgan –
I recently purchased the 12210729 ECM for my 2004 Chevy Silverado and couldn’t be happier with the service. The unit arrived quickly with very reasonable shipping costs, which was a pleasant surprise. They programmed the ECU to my VIN perfectly, so installation was straightforward and plug-and-play. Communication was excellent throughout the process—every question I had was answered promptly, making the entire experience smooth and worry-free.