Cummins B6.7 SCR 2018-2021: OEM 5507928

Keeping Cummins B6.7 Emissions Systems in Sync (2018–2021)

What is it?
The Cummins B6.7 SCR unit, used on 2018–2021 engines and identified by OEM 5507928, is a downstream emissions component responsible for managing nitrogen oxide (NOx) levels in the exhaust stream. It works as part of the SCR process, using Diesel Exhaust Fluid (DEF) to support chemical conversion before exhaust gases exit the system.

Why choose this SCR Assembly?
Aftertreatment systems rely on every component working together as designed. When an SCR unit becomes less effective or damaged, the entire emissions process can fall out of balance, often leading to warning indicators or operating limitations. Using the correct OEM-matched SCR helps ensure the B6.7 aftertreatment system continues to operate as a coordinated unit rather than a collection of disconnected parts.

Key Benefits
✅ Maintains proper NOx treatment within the emissions system
✅ Designed to align with Cummins B6.7 aftertreatment layouts
✅ Supports consistent interaction with DEF dosing and sensors
✅ Direct replacement that fits without modification
✅ Built for continuous operation in high-temperature exhaust conditions

Applications
This SCR assembly is used on Cummins B6.7 engines found in delivery trucks, municipal vehicles, vocational equipment, and regional transport applications produced between 2018 and 2021. These platforms depend on predictable emissions behavior to stay compliant and operational during daily service.

Installation Notes
Always allow the exhaust and aftertreatment components to cool fully before service. Remove the existing SCR unit and inspect surrounding sensors, DEF lines, and mounting points for signs of wear or contamination. Install the replacement unit using proper seals and hardware, then clear any system codes and confirm normal emissions behavior through diagnostics.

Final Thoughts
When emissions alerts, NOx-related faults, or inconsistent aftertreatment behavior begin to appear, the SCR unit is often a key factor. Replacing it with the correct OEM-specified component can help restore proper emissions flow and system stability. The Cummins B6.7 SCR (OEM 5507928) plays an essential role in keeping the emissions system operating as intended.