A045N268 | Genuine Cummins® Doser Fluid Supply Module 2.2 12V

A Doser Fluid Supply Module A045N268 is a component of a diesel vehicle’s emissions system that supplies and controls Diesel Exhaust Fluid (DEF) before it is injected into the exhaust.

General Specifications

Fitment

• Pump DEF from the DEF tank

• Maintain correct DEF pressure

• Control the amount of DEF sent to the dosing injector

• Purge DEF lines to prevent freezing or crystallization

• Ensure proper SCR system operation

• Help the vehicle meet emissions regulations

Signs of a Bad Fuel Injection Pump

Warning lights & messages

• Check Engine Light

• Messages like “Service DEF System”

• DEF system fault warnings

• No-start countdown on many diesel vehicles

Performance issues

• Reduced power / limp mode

• Speed limitation if the fault is ignored

DEF system problems

• Incorrect DEF pressure codes

• DEF not being injected properly

• Increased or inconsistent DEF consumption

Cold-weather issues

• DEF lines not purging properly

• DEF freezing in lines or injector

Unusual noises

• DEF pump not running or running very loudly

Diagnostic trouble codes

• Doser supply pressure or flow faults

• SCR efficiency or DEF delivery codes

About Cummins

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.