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 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
Steven Roberts –
I purchased the 15246462 ECM for my 2004 GMC Sierra, and the whole process was seamless. The unit arrived quickly with free shipping, which was a nice bonus. The plug-and-play setup made installation straightforward, and it worked perfectly right out of the box. I appreciate the clear communication from the seller, as they answered all my questions promptly.
Colin Taylor –
Super fast shipping and the ECM came already VIN programmed—plug and play was a breeze. Great service!
Kevin Jenkins –
I was nervous about ordering an ECM online, but this 2004 GMC Sierra 6.6L unit arrived quickly and already programmed to my VIN, which saved me a ton of hassle. The seller’s communication was outstanding—they answered all my questions promptly and kept me in the loop throughout the shipping process. Installation was straightforward, and once installed, my truck started right up with no issues. I really appreciated the professional programming service included because it gave me peace of mind. Overall, a smooth experience from start to finish, and the free shipping was a nice bonus.