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
Dylan Parker –
Fast shipping and the plug-and-play setup made installing this ECU on my 2004 Silverado a breeze. Highly recommend their professional programming service!
Victor Sharp –
I ordered the 12244189 ECM for my 2004 Silverado, and it arrived quickly with free shipping, which was a pleasant surprise. The unit was already VIN programmed, so installation was straightforward, and my truck fired right up without any issues. The team was also very responsive, answering my questions promptly and making the whole process smooth. Overall, great quality and excellent service.
Ethan Anderson –
I was really impressed with how smoothly this ECM arrived. The free shipping was a nice surprise and definitely saved me some money. It was already VIN programmed when it arrived, so installation was straightforward and I didn’t have to worry about any complicated setup. The performance of my Silverado has improved noticeably, and it runs like new again. I also appreciated the seller’s quick responses to my questions before I bought it, which helped me feel confident in my purchase.
Steven Sanders –
I had been struggling with my 2004 Silverado’s performance issues for weeks, so I decided to purchase this ECM unit. The fact that it came VIN programmed was a huge relief because I’m not very tech-savvy. Shipping was surprisingly fast and affordable, which was a pleasant bonus. When I reached out with a couple of questions, the support team responded quickly and helped me feel confident about the installation. After swapping the unit, my truck runs smoother than it has in years—definitely worth every penny.