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
Kevin Cox –
I ordered the 3976873 ECM for my 2004 RAM 5.9L Cummins, and I’m really impressed with how smooth the whole process was. The unit came VIN programmed and ready to install, which saved me a ton of hassle. Shipping was free and arrived sooner than I expected, so my truck was back on the road quickly. The quality of the part feels top-notch, and I noticed a definite improvement in how the engine runs. They also kept me in the loop every step of the way, answering my questions promptly, which made me feel confident in what I was buying.
Eric Miller –
I’m really impressed with the quality of this ECM for my 2004 Ram 5.9L Cummins. The VIN programming was spot on, so it was basically plug-and-play once I got it installed. Shipping was reasonable and the whole process was smooth, plus the team kept me updated every step of the way. Definitely took the stress out of what could have been a complicated repair.
Cameron Green –
I purchased the 3976873 ECM for my 2004 RAM 5.9L Cummins and was really impressed by the plug-and-play setup. The unit arrived quickly with free shipping, which was a nice bonus. The programming was spot on, and my truck fired up without any issues. Definitely recommend this if you want a hassle-free replacement.
Blake Ramirez –
I was really impressed with how smoothly this ECM arrived and was ready to go right out of the box. The VIN programming was spot on, so I didn’t have to worry about any complicated setup. Shipping was free and surprisingly fast, which made the whole process even better. The truck fired up immediately, and I noticed a real improvement in how it runs. I’ll definitely be coming back if I ever need another module.
Cole Hamilton –
Arrived quickly with free shipping and was perfectly programmed for my 2004 RAM 5.9L—works like a charm right out of the box.
Max Hall –
Super fast shipping and the ECU was programmed perfectly for my 2004 RAM Cummins—plug-and-play, no hassle at all.