4387658RX | Genuine OEM Cummins DEF Doser Fluid Supply Module

The 4387658RX Genuine OEM Cummins DEF Doser Fluid Supply Module is a component of the Diesel Exhaust Fluid (DEF) dosing system. It supplies DEF fluid within the dosing system to support proper operation of the vehicle’s emissions control system.

PRODUCT INFORMATION

Part Number: 4387658RX
Brand: Cummins
Condition: Genuine OEM Remanufactured
Component: DEF Doser Fluid Supply Module
Fuel Type: Diesel
Engine Applications: Cummins diesel engine applications equipped with compatible DEF dosing systems
Other important specifications:
• Designed for use in a Cummins DEF dosing system
• Handles Diesel Exhaust Fluid (DEF) within the dosing system
• Genuine Cummins Remanufactured component
• Verify application by Part Number and vehicle/engine configuration

APPLICATIONS

The 4387658RX DEF Doser Fluid Supply Module is intended for compatible Cummins diesel applications equipped with a DEF dosing system. Exact fitment depends on the vehicle, engine, emissions system, and configuration. Always verify the original part number before purchase.

FUNCTION

The DEF Doser Fluid Supply Module manages the supply of Diesel Exhaust Fluid to the dosing system. Proper DEF supply is necessary for the emissions aftertreatment system to operate as designed.

A worn, damaged, or failing DEF Doser Fluid Supply Module may cause symptoms such as:
• DEF system fault codes
• Check engine or emissions warning light
• Incorrect or insufficient DEF delivery
• Reduced engine performance or derate conditions
• DEF dosing system malfunction
• Aftertreatment system faults

WHY REPLACE A DEF DOSER FLUID SUPPLY MODULE?

A malfunctioning DEF Doser Fluid Supply Module can interfere with proper DEF delivery and aftertreatment system operation. Replacing a defective module with the correct Genuine Cummins remanufactured component can help restore proper DEF supply and support normal emissions system operation.

FITMENT INFORMATION

Please verify the Part Number, VIN, vehicle model, engine, emissions system, model year, and configuration before purchase. The 4387658RX should only be installed where the Part Number and application have been confirmed as compatible.

If you are unsure whether this part is correct for your vehicle, please contact us with your VIN and original part number. We are happy to help verify compatibility before purchase.

GENUINE CUMMINS PART

Part Number: 4387658RX