Cummins B6.7 SCR 2018-2021: OEM 5507928

Engine-Specific NOx Control Module for Cummins B6.7 Engines (2018–2021)

What is it?
The Cummins B6.7 SCR (Selective Catalytic Reduction) assembly for 2018–2021 model years, identified by OEM part number 5507928, is a fundamental emissions aftertreatment component. It works with Diesel Exhaust Fluid (DEF) to trigger a chemical reaction that transforms nitrogen oxides (NOx) in the exhaust into harmless nitrogen and water before the gases exit the system, helping the engine stay within regulatory emissions limits.

Why choose this SCR Assembly?
This SCR unit is engineered to match Cummins’ original specifications for the B6.7 engine platform, ensuring correct fit and seamless integration with DEF injectors, sensors, and control modules. Over time, SCR components can lose efficiency, which may reduce NOx conversion effectiveness and trigger system warnings. Choosing the correct OEM-specified unit supports more predictable emissions behavior and consistent system coordination.

Key Benefits
✅ Built specifically for Cummins B6.7 emissions systems
✅ Facilitates dependable NOx conversion with DEF interaction
✅ Supports coordinated operation with downstream aftertreatment components
✅ Direct-fit replacement — no modifications required
✅ Designed for the rigors of 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 produced between 2018 and 2021. It’s commonly found in delivery fleets, regional transport units, vocational work vehicles, and other applications where emissions management and system consistency are important.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to cool completely. Remove the existing SCR unit and inspect adjacent DEF lines, connectors, sensors, and mounting hardware for wear or contamination. Install the replacement SCR assembly using proper seals and fasteners to ensure a secure and leak-free fit. After installation, clear stored fault codes and verify correct SCR system behavior using diagnostic tools.

Final Thoughts
If your Cummins B6.7-equipped vehicle is showing NOx-related warnings or uneven emissions system behavior, replacing the SCR assembly with the correct OEM-specified unit can help restore more dependable NOx control and coordinated aftertreatment performance. The Cummins B6.7 SCR (OEM 5507928) plays a key role in maintaining emissions system balance and supporting reliable vehicle use.