Description
2004 Buick Rendezvous 3.6L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2004 Buick Rendezvous 3.6L 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
Travis James –
I was really impressed with the quality of this ECM for my 2004 Buick Rendezvous. The unit arrived quickly with free shipping, which was a nice bonus. They also provided professional VIN programming, so it was essentially plug-and-play once I got it installed. Their communication was excellent—they kept me updated throughout the process and answered all my questions promptly.
Frank Jenkins –
The updated ECM arrived quickly with free shipping and was perfectly programmed for my 2004 Buick Rendezvous—super smooth plug-and-play experience.
Nathan Douglas –
I was really impressed with how smooth the whole process went when I ordered the 2004 Buick Rendezvous ECM. The unit arrived quickly thanks to their reasonable shipping rates, and it was already VIN programmed, which saved me a ton of hassle. I had a few questions about installation, and their customer service responded promptly and clearly, making me feel confident about the purchase. Once installed, my vehicle ran like new again with no warning lights or glitches. Definitely a solid product and great experience overall.
Jose Walker –
I needed a replacement ECM for my 2004 Buick Rendezvous, and this unit arrived exactly as described. What really impressed me was how it came VIN programmed and ready to install—no headaches or extra trips to a mechanic. The shipping was surprisingly quick and affordable, which made the whole process stress-free. When I had a couple of questions about installation, their team responded promptly and clearly, which I appreciated. After swapping it in, my vehicle runs smoother than it has in months. Definitely recommend this seller for anyone needing a reliable ECM.