Cummins X15 SCR 2018-2021: OEM 5506027

Engine-Matched NOx Control for Cummins X15 Engines (2018–2021)

What is it?
The Cummins X15 SCR (Selective Catalytic Reduction) assembly with OEM part number 5506027 is an emissions aftertreatment component designed for Cummins X15 diesel engines manufactured between 2018 and 2021. It works together with Diesel Exhaust Fluid (DEF) to support a chemical reaction that converts nitrogen oxides (NOx) in the exhaust into nitrogen and water before the gases exit the system, helping the vehicle meet emissions standards.

Why choose this SCR Assembly?
This SCR unit is engineered to meet Cummins’ original specifications for X15 engines, ensuring accurate fitment and dependable communication with DEF dosing equipment, emissions sensors, and engine control modules. Over time, SCR components can wear or accumulate contamination, reducing NOx conversion efficiency and potentially triggering emissions system alerts. Installing the correct OEM-specified assembly helps maintain steady emissions control and smoother aftertreatment behavior.

Key Benefits
✅ Designed specifically for Cummins X15 aftertreatment systems (2018–2021)
✅ Supports reliable NOx conversion with DEF chemistry
✅ Helps maintain coordinated operation with related emissions components
✅ Direct-fit replacement — no modifications required
✅ Built for demanding exhaust environments

Applications
This SCR assembly is suitable for heavy-duty trucks and commercial vehicles equipped with Cummins X15 engines built between 2018 and 2021. It’s commonly used in long-haul tractors, regional freight vehicles, vocational trucks, and other commercial platforms where dependable emissions control and regulated exhaust behavior are essential.

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

Final Thoughts
If your Cummins X15-powered vehicle is showing NOx-related warnings, inconsistent emissions readings, or uneven aftertreatment behavior, replacing the SCR assembly with the correct OEM-specified part can help restore balanced exhaust treatment and dependable system performance. The Cummins X15 SCR (OEM 5506027) plays a central role in managing regulated exhaust chemistry and supporting reliable operation across demanding duty cycles.