Cummins B6.7 SCR 2018-2021: OEM 5507928

Balanced NOx Reduction Module for Cummins B6.7 Engines (2018–2021)

What is it?
The Cummins B6.7 SCR (Selective Catalytic Reduction) unit for 2018–2021 model years, identified by OEM part number 5507928, is a key aftertreatment component designed to reduce nitrogen oxides (NOx) in the exhaust. Working together with Diesel Exhaust Fluid (DEF), the SCR assembly facilitates a chemical reaction that converts NOx into nitrogen and water before the exhaust exits the system, helping the engine meet emissions targets.

Why choose this SCR Assembly?
This SCR module is built to match Cummins’ original specifications for the B6.7 engine platform, ensuring correct fitment and seamless interaction with DEF injectors, sensors, and control systems. When an SCR component becomes worn or less efficient over time, its ability to convert NOx can decline, potentially leading to emissions alerts and uneven aftertreatment responses. Installing the correct OEM-specified SCR helps maintain consistent NOx reduction and coordinated system operation.

Key Benefits
✅ Engine-matched design for Cummins B6.7 emissions systems
✅ Helps facilitate reliable NOx conversion with DEF chemistry
✅ Supports steady coordination with other aftertreatment components
✅ Direct-fit replacement — no modifications required
✅ Constructed for heavy-duty exhaust environments

Applications
This SCR assembly is ideal for medium- and heavy-duty trucks and commercial vehicles powered by Cummins B6.7 engines built between 2018 and 2021. It’s commonly used in delivery fleets, vocational vehicles, regional transport units, and other applications where dependable emissions control and regulatory compliance are essential.

Installation Notes
Ensure the exhaust and aftertreatment system has cooled completely before servicing. Remove the existing SCR unit and inspect nearby DEF lines, sensors, and mounting brackets for wear or contamination. Install the replacement SCR assembly using proper seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored fault codes and verify correct system behavior with diagnostic checks.

Final Thoughts
If your Cummins B6.7-equipped vehicle is experiencing emissions system alerts or reduced NOx control effectiveness, replacing the SCR assembly with the correct OEM-specified unit can help reestablish coordinated aftertreatment performance. The Cummins B6.7 SCR (OEM 5507928) plays an important role in sustaining emissions system stability and supporting reliable operation.