Cummins Engine Control Module, Block Mounted ECM.
Remanufactured & Programmed to fit your vehicle.

P/N # 3963994

Fits 2003 Vehicles AT

Please email us the VIN #, Reference # from Valve Cover 8 digits starting with 53040 followed by 2 letters, AT or MT, 4x4 or 4x2 Security or not, Federal or California Emissions.

These ECM's come with a 1 Year Parts Replacement Warranty

We have a Tech Assist program so if you ever run into any issues you can contact us and speak with one of our 8 ASE Certified Master Techs.