This is the Bosch 044404229X, a new DEF supply module made by Bosch. It is the pump unit that draws diesel exhaust fluid from the tank, builds pressure and feeds the dosing module. This one is the 12 volt version with a check valve. It crosses to Cummins 2871879, 2880157 and 4387657 and takes the place of the earlier Bosch 0444042003, 0444042013 and 0444042134.

A supply module that has failed usually shows up as a DEF pressure or DEF dosing fault code, a low DEF pressure reading, a pump that will not prime or purge, or crystallized fluid around the module. The same codes can come from a plugged filter in the module, a frozen or kinked DEF line, bad fluid or a stuck dosing valve, so check those before replacing the pump. This is a replacement part for the factory selective catalytic reduction (SCR) system.

Specifications

Fits / Applications

• Cummins engines with a Bosch DEF system on 12 V that use supply module 2871879, 2880157 or 4387657
• Cummins numbers A028Y792, A029C023 and A052U282
• Also listed under OE number 2P0131113B
• Order by the number on the old pump and the system voltage. We do not list engine models because the catalogs do not agree on them.

Flush or replace crystallized DEF lines, fit clean fluid and check the tank pickup and the heater lines before running the new pump. Clear the fault codes and run the system’s prime and purge test after fitting.

Part Numbers & Cross Reference

Bosch 044404229X  ·  Bosch 0444042003  ·  Bosch 0444042013  ·  Bosch 0444042134  ·  Bosch 0444042135  ·  Bosch 098644D207  ·  Cummins 2871879  ·  Cummins 2880157  ·  Cummins 4387657  ·  Cummins A028Y792  ·  Cummins A029C023  ·  Cummins A052U282  ·  Other OE 2P0131113B

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

What is the difference between the 044404229X and the 044404229Z?

The 29X is the 12 V supply module with check valve and crosses to Cummins 2871879 and 4387657. The 29Z is the 24 V version and crosses to Cummins 2871880 and 4387658. They do not interchange.

What numbers does the 044404229X replace?

Bosch 0444042003, 0444042013, 0444042134 and 0444042135, and Cummins 2871879, 2880157, 4387657, A028Y792, A029C023 and A052U282.

Can I use it in place of a 0444042178?

No. The 0444042178 is the 12 V supply module without a check valve and crosses to Cummins 4387304 and 5418805. Order the number that is on your old pump.

Is this a new or remanufactured DEF pump?

It is a new supply module made by Bosch, not a rebuild. Call 530-668-0818 with your engine serial number if you want us to confirm the match.

Related Parts

• Cummins ISB & QSB 6.7L Medium-Duty Injector | 0986435697 | Bosch Authorized Remanufactured by VFI
• 2010-2016 Cummins ISB 6.7 Midrange (Rear Gear) CP3 Injection Pump | Bosch 0986437370 Remanufactured
• Cummins ISL & QSL 8.9L, Case IH, New Holland & Komatsu Fuel Injector | Bosch 0445120236 New (Cummins 5263308)
• Cummins ISX15 EPA10 XPI Common-Rail Fuel Injector | Alliant Power AP55101 Remanufactured

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.