Description
2004 Buick Century 3.1L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2004 Buick Century 3.1L 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
Ian Adams –
The VIN-programmed ECM fit perfectly and was ready to go out of the box; their free shipping was a nice bonus.
Fast turnaround and the plug-and-play setup made this replacement a breeze—great service from start to finish.
They answered all my questions quickly and kept me informed throughout the process; the updated ECM works flawlessly.
Quality repair and very reasonable shipping costs—highly recommend for anyone needing an ECM for their Buick.
The programming was done professionally, and the unit fired right up with no issues. Excellent communication all around.
Adrian Howard –
I’m really impressed with the updated ECM for my 2004 Buick Century. The unit arrived quickly with very reasonable shipping costs, which was a bonus. It was already VIN programmed, so installation was straightforward and saved me a lot of hassle. The quality of the repair is top-notch, and my car runs like new again.