wp20532 - Genuine Cummins Aftertreatment Device - 1 - wisentpartscenter.com

Description

Cummins 5505924 Aftertreatment SCR Catalyst - Genuine Cummins SCR Catalyst

The Cummins 5505924 is a genuine Cummins aftertreatment SCR catalyst. It's where the ammonia from injected DEF reacts across the catalyst to convert NOx into nitrogen and water, the core of the SCR emissions system.

Key Functions:

- Converts NOx to nitrogen and water across the SCR catalyst

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

It's the catalyst that actually cleans up NOx. Once DEF has decomposed to ammonia upstream, the mix passes over this catalyst and the NOx converts to harmless nitrogen and water. A spent or damaged catalyst stops converting, which shows as poor NOx conversion faults and derates.

Issue Symptoms / When to Replace

- Poor NOx conversion / SCR efficiency fault codes
- Derate from unresolved SCR faults
- Physical damage, melted substrate, or a rattling core
- Exhaust leaks at the catalyst joints

Brand Information

A genuine Cummins 5505924 SCR catalyst is built to the exact substrate and coating spec the emissions system needs to hit NOx conversion targets and pass compliance - which off-brand catalysts can't reliably match. Cummins builds engines, aftertreatment, and power systems worldwide.

Installation Notes

Match the bung/sensor-port configuration - 2871603 is three-bung, 5505924 is two-bung. Confirm which your truck is set up for so the NOx/temp sensors and harness land correctly.

How to Identify an OEM Part

Genuine Cummins catalysts have the Cummins part number and a serial number carved/stamped into the part.

Why buy from Wisent Parts
  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.