4388105 | Genuine OEM Cummins DEF Doser Pump ISB/QSB

The 4388105 Genuine OEM Cummins DEF Doser Pump is a component designed for use in compatible Cummins ISB and QSB engine aftertreatment systems. This pump helps deliver Diesel Exhaust Fluid (DEF) to the emissions control system to support proper Selective Catalytic Reduction (SCR) operation.

PRODUCT INFORMATION

Part Number: 4388105
Brand: Cummins
Condition: Genuine OEM
Component: DEF Doser Pump
Fuel Type: Diesel
Engine Applications: Cummins ISB/QSB (compatibility to be verified)
Other important specifications: Diesel Exhaust Fluid dosing system component

APPLICATIONS

The 4388105 DEF Doser Pump is intended for applicable Cummins ISB and QSB engine configurations equipped with compatible DEF and SCR aftertreatment systems. Exact fitment should be confirmed using the original part number, engine serial number, and vehicle or equipment information.

FUNCTION

The 4388105 DEF Doser Pump is designed to support the delivery of Diesel Exhaust Fluid into the exhaust aftertreatment system as part of the emissions control process. Proper operation helps support DEF dosing and the intended function of the SCR emissions control system.

A worn, damaged, or failing DEF Doser Pump may cause symptoms such as:

• DEF system warning messages

• SCR or aftertreatment system fault codes

• Improper or interrupted DEF delivery

• Emissions control performance issues

• Reduced aftertreatment system efficiency

• Engine derating associated with emissions system faults

These symptoms may also be caused by other DEF system components or faults and do not necessarily confirm pump failure.

WHY REPLACE A DEF DOSER PUMP?

A damaged or malfunctioning DEF Doser Pump can affect fluid delivery and proper aftertreatment system operation. Replacing it with the correct Genuine OEM Cummins component can help restore proper DEF delivery and support the intended function of the emissions control system.

FITMENT INFORMATION

Before purchasing, verify the Part Number, VIN (where applicable), vehicle or equipment model, engine serial number, and aftertreatment system configuration to confirm the correct application. Do not assume compatibility based only on the Cummins ISB or QSB engine family.

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: 4388105