This 2003 Dodge Ram 2500 / 3500 5.9L Cummins Turbo Diesel Engine Control Module (ECM) is a high-quality, direct-fit refurbished OEM replacement engineered to restore reliable engine performance. Each module is professionally refurbished, VIN programmed to your vehicle at no additional charge, and thoroughly tested before shipment to ensure a true Plug & Play installation.
Every unit is individually inspected, repaired, programmed, and quality-control tested by experienced technicians using professional OEM-compatible equipment. No module leaves our facility without successfully completing our comprehensive testing process.
Compatible OEM Part Number:
P56040479
56040479
✓ 1 × OEM Refurbished Engine Control Module (ECM)
✓ FREE VIN Programming for your exact vehicle
✓ Latest OEM Software Updates (when applicable)
Year: 2003
Make: Dodge
Model: Ram 2500 / Ram 3500
Engine: 5.9L Cummins Turbo Diesel I6
Selected Part Number: P56040479
Compatible Part Numbers:
P56040479
56040479
✓ FREE VIN Programmed Specifically for Your Vehicle
✓ True Plug & Play Installation
✓ OEM Genuine Refurbished Module
✓ Professionally Tested & Quality Inspected
✓ Lifetime Warranty
✓ Latest OEM Software Updates (when applicable)
✓ Fast Worldwide Shipping
✓ 150+ Verified 5-Star Reviews
✓ Professional Technical Support Before & After the Sale
To properly program your ECM before shipment, we require your 17-digit Vehicle Identification Number (VIN).
After placing your order, simply send us your VIN through eBay messages so we can program your module before shipping.
Please Note: In some applications, a standard vehicle relearn or initialization procedure may be required after installation to complete the replacement process. This is a normal OEM procedure on certain vehicles and does not indicate a problem with the module.
No Start or Hard Starting
Engine Cranks but Will Not Start
Check Engine Light
Poor Engine Performance
Low Power or Limp Mode
Injector Communication Faults
Diagnostic Communication Failure
Intermittent Stalling
Fuel Delivery Control Issues
Fault Codes Related to ECM Failure
We offer fast worldwide shipping. Your module is securely packaged, VIN programmed, and shipped after VIN confirmation.
Expedited shipping options are available at checkout.
Returns are accepted within our stated return period if the item is unused and in its original condition. A restocking fee may apply. Please review our return policy for complete details.
Every module sold by Automobile Computer Solutions (A.C.S.) includes our Lifetime Warranty covering defects in workmanship and the repairs or refurbishment performed by our technicians.
Warranty coverage applies to the original purchaser only and does not cover damage caused by water intrusion, fire, collision, improper installation, wiring faults, voltage spikes, corrosion, modified vehicles, physical damage, or any other vehicle-related failures beyond the control of the ECM.
We stand behind every module we sell and are committed to providing dependable OEM-quality replacements backed by exceptional customer support.