Description
Genuine Bosch DEF dosing module 2.2 (P/N 0 444 043 017) for the Cummins SCR aftertreatment system on EPA10/EPA13 ISB, ISC, ISL, and ISX engines. The module meters diesel exhaust fluid into the SCR catalyst inlet under engine-controller command; replacing it restores SCR efficiency, clears DEF dosing fault codes, and prevents derate. Bosch is the original supplier — this is the same dosing unit Cummins ships as service replacement.
Signs You Need a New DEF Dosing Module
- SCR efficiency / NOx-conversion fault codes (SPN 4364, 3364, 4361, 4334, etc.)
- “DEF Dosing Unit” or “DEF Quality” warning lamps and active engine derate
- Crystallized urea around the dosing-module mounting flange
- Failed dosing-pressure-build or DEF-flow self-test at key-on
- Visible damage to the module body, electrical connector, or DEF inlet line
Specifications
| Manufacturer | Bosch (Genuine) |
|---|---|
| Part Number | 0 444 043 017 |
| Part Type | DEF Dosing Module 2.2 |
| System | Cummins SCR Aftertreatment |
| Engine Compatibility | Cummins ISB, ISC, ISL, ISX (EPA10 / EPA13) |
| Condition | New, OEM |
Cross References
This module replaces or is equivalent to the following part numbers:
- Bosch: 0444043008, 0444043017, 0444043018, 0444043031, 0444043033, 0444043034, 0986 44D 286, 0986 44F 286
- Cummins: 1819798, 1819798PE, 2871878, 2871878CUM, 2871878NX, 2880156, 2880156NX, 2880156RX, 2888112, 2888112NX, 2888112RX, 2888173, 2888173NX, 2888173RX, 2888174, 2888174NX, 2888174RX, 4705466, 4706042
- Cummins Power Gen / Onan: A028Y791, A030P707, A030P708, A043C088
- Navistar: 2511446C1
- Also known as: 030707, 6407750, H0502517CD, N8898806
Applications
This DEF dosing module fits Cummins SCR systems on the following engine families:
- Cummins ISB 6.7L (EPA10 / EPA13, 2010–2016 on-highway)
- Cummins ISC 8.3L / ISL 8.9L (EPA10 / EPA13)
- Cummins ISX11.9 / ISX15 (EPA10 / EPA13, CM2250, CM2350)
- Cummins QSX15 industrial / power generation with SCR
Representative trucks and equipment using these engines:
- Freightliner M2 106, Cascadia, Coronado with ISB / ISC / ISX
- Kenworth T370, T440, T660, T680, T800, W900 with ISL or ISX
- Peterbilt 337, 348, 386, 389, 579 with ISL or ISX
- International medium-duty with ISB / MaxxForce DT (where Cummins SCR is fitted)
- RV chassis (Freightliner XC, Spartan K2/K3) with ISB or ISL
- Cummins-powered school and transit buses with ISB or ISL
Verify your Cummins ESN, CPL, and SCR system architecture before ordering — some EPA17+ X-series engines use a different dosing module. Replace the inlet O-ring/seal at install.
