Cummins B6.7 SCR 2018-2021: OEM 5418580

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

What is it?
The Cummins B6.7 SCR (Selective Catalytic Reduction) assembly, identified by OEM part number 5418580, is a key emissions aftertreatment component for Cummins B6.7 diesel engines produced between 2018 and 2021. Working together with Diesel Exhaust Fluid (DEF), this unit supports a chemical conversion that transforms nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, helping keep emissions within regulatory limits.

Why choose this SCR Assembly?
This SCR module is manufactured to Cummins’ original specifications for the B6.7 platform, ensuring precise fitment and dependable interaction with DEF injectors, emissions sensors, and engine control systems. Over time, SCR functionality can diminish due to use, contamination, or age, which may reduce NOx conversion effectiveness and trigger emissions alerts. Selecting the correct OEM-specified unit helps maintain consistent emissions behavior and coordinated aftertreatment operation.

Key Benefits
✅ Specifically designed for Cummins B6.7 aftertreatment systems (2018–2021)
✅ Supports reliable NOx conversion through DEF chemistry
✅ Helps maintain coordinated function with emissions system components
✅ Direct-fit replacement — no modifications required
✅ Built for demanding exhaust conditions and duty cycles

Applications
This SCR assembly is ideal for medium- and heavy-duty vehicles equipped with Cummins B6.7 engines manufactured between 2018 and 2021. Common applications include delivery trucks, vocational fleets, regional transport vehicles, and other commercial platforms where dependable emissions control and regulatory compliance are essential to daily operation.

Installation Notes
Allow the exhaust and aftertreatment system to cool completely before beginning service. Remove the existing SCR module and inspect the surrounding DEF lines, sensors, and mounting hardware for signs of wear, soot buildup, or damage. Install the replacement assembly using proper seals and fasteners to ensure a secure, leak-free fit. After installation, clear any stored system codes and verify correct SCR performance using diagnostic tools.

Final Thoughts
If your Cummins B6.7-equipped vehicle is showing NOx-related alerts, inconsistent emissions readings, or erratic aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore smoother emissions control. The Cummins B6.7 SCR (OEM 5418580) plays a central role in regulating exhaust chemistry and supporting dependable vehicle operation.