Volvo/Renault AdBlue Pump 21576178 (Reman)

Description

Volvo/Renault AdBlue Pump 21576178 (Reman) – Selective Catalytic Reduction Delivery Module, urea injection

Brand: Volvo/Renault

Type: Denoxtronic 2.2

Manufacturer: Bosch

Euro Norm: Euro 5

OE number: 21335892, 21335897, 21576178, 85013590

Manufacturer Part No.: 098644D211, 098644D222, 0444042012

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The Volvo AdBlue Pump 21576178 is a remanufactured OEM DEF (Diesel Exhaust Fluid) supply module—also called the AdBlue dosing pump, urea delivery unit, or Bosch Denoxtronic pump—designed for the Selective Catalytic Reduction (SCR) system in Volvo and Mack heavy-duty vehicles. This critical component meters AdBlue precisely into the exhaust stream to convert harmful NOx emissions into harmless nitrogen and water, ensuring compliance with emission standards while maintaining engine efficiency and performance.

Core Function of the 21576178 AdBlue Pump

The pump draws DEF from the tank, pressurizes it, and supplies it to the injector for optimal dosing. It includes integrated heating elements (often 24V) to prevent freezing in cold weather, pressure and temperature sensors, and control valves for reliable operation. When functioning correctly, it keeps emissions low, avoids derate/limp mode, and supports smooth, fuel-efficient hauling.

Compatible with various Volvo and Mack applications, including:

• Volvo construction equipment (e.g., EC140E, EC160E, EC180E, EC220E, EC250E, EC300E, excavators and wheeled excavators)
• Select Volvo trucks and Mack trucks (heavy-duty models using Bosch systems)
• Shared platforms with Mack engines

Cross-references include Bosch numbers like 044404227G, 21335892, 21335897, 23390381, and others such as 21577507. Always verify exact fitment with your machine’s serial number, VIN, or existing pump to ensure compatibility.

Common Failure Symptoms

Over time, the 21576178 can suffer from urea crystallization, sensor faults, electrical issues, or contamination. Typical warning signs:

• Dashboard alerts: “AdBlue system malfunction,” “SCR fault,” “Emissions error,” or countdown to no-start
• Reduced power (derate/limp mode)
• Diagnostic codes related to pressure (e.g., P20E8), dosing efficiency (P204F), or temperature/pressure errors
• Irregular DEF usage or complete SCR shutdown

These issues are common in high-hour machines and can cause costly downtime or damage to NOx sensors and the SCR catalyst if not addressed promptly.

Reman pumps match OEM performance and are a smart choice for fleet or construction operators seeking value without sacrificing quality. Professional installation is recommended, including system priming, pressure checks, and ECU adaptation.

Why Replace Promptly?

• Restore full emission compliance
• Eliminate derate, warnings, and operational limits
• Protect downstream components like sensors and catalyst
• Ensure reliable performance in demanding conditions

A faulty AdBlue pump can halt your Volvo or Mack equipment—don’t risk it. Replace with a quality 21576178 to get back to productive, clean operation quickly.

Popular searches: Volvo 21576178 AdBlue pump, Mack DEF dosing module 21576178, Volvo excavator urea pump replacement, Bosch AdBlue supply unit 21576178, 21576178 DEF pump Volvo.

Additional Information