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
Paul Peterson –
Product arrived quickly with free shipping and was already VIN programmed—plug-and-play made installation a breeze.
Fast turnaround and the team answered all my questions promptly, making the whole process smooth and hassle-free.
The ECU was perfectly programmed for my Silverado and shipping was surprisingly affordable, definitely worth it.
Excellent communication throughout, and the part worked flawlessly right out of the box with no additional setup needed.
Super quick delivery and the professional programming saved me a ton of time—highly recommend for anyone needing this part.