Description
2004 RAM Ram Truck (Cummins) 5.9L ECM / ECU – VIN Programmed | Updated
This Engine Control Module (ECM / ECU) is a genuine OEM replacement for all 2004 RAM Ram Truck (Cummins) 5.9L 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
Spencer Edwards –
The VIN programmed ECM arrived quickly with free shipping, and it worked perfectly right out of the box. Excellent communication throughout the process made this an easy purchase.
Matthew Anderson –
I needed a replacement ECM for my 2004 RAM with the 5.9L Cummins, and this unit was exactly what I was looking for. The best part was that it came VIN programmed and ready to install, which saved me a ton of time and hassle. Shipping was fast and reasonably priced, arriving well within the estimated window. The quality of the part feels top-notch, and after installation, my truck runs like new again. The team was also very responsive when I had a couple of questions before ordering, which made the whole process smooth and stress-free.
Chris Gonzalez –
I recently purchased the 3957300 ECM for my 2004 RAM Cummins, and I’m very impressed with the quality and performance. The unit arrived quickly with free shipping, which was a great bonus. They also offered professional VIN programming, so it was ready to go right out of the box, saving me a lot of hassle. Communication was spot on too—I got prompt updates and answers to all my questions throughout the process.
Chase Brooks –
I was really impressed with how smoothly the whole process went. The ECM arrived quickly with free shipping, which was a nice surprise. The unit was VIN programmed perfectly, so installation was basically plug-and-play with no hiccups. I had a few questions about compatibility, and their customer service responded promptly and clearly, which gave me confidence in my purchase. My Ram 2500 is running like new again, and I couldn’t be happier with the quality and attention to detail.
Trevor Johnson –
Super fast shipping and the ECU came fully programmed and ready to install—saved me a ton of hassle. Communication was great too, they answered all my questions right away.