Cummins ISB DOC

Improve Exhaust Efficiency with the Cummins ISB DOC

What is it?
The Diesel Oxidation Catalyst (DOC) for the Cummins ISB engine is a vital emissions-control component. It helps convert hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream into cleaner, less harmful gases, supporting the emissions system in maintaining steady and reliable function.

Why choose this DOC?
Designed specifically for Cummins ISB applications, this DOC provides correct fitment and dependable emissions capability. When the catalyst becomes worn or obstructed, it can cause higher exhaust restriction, repeated regeneration events, or emissions-related fault codes. Installing the proper DOC supports clean exhaust movement and consistent system operation.

Key Benefits
✅ Converts HC and CO into cleaner exhaust output
✅ Supports downstream aftertreatment components
✅ Helps maintain steady exhaust flow and reduce restriction
✅ Direct-fit design requiring no modifications
✅ Built to withstand demanding diesel operating environments

Applications
Ideal for medium-duty trucks, vocational vehicles, buses, and other equipment powered by Cummins ISB engines where emissions compliance and reliable operation are essential.

Installation Notes
Allow the exhaust system to cool fully before beginning service. Examine the DOC housing and surrounding hardware for buildup, cracking, or damage. Always install new clamps, seals, and gaskets. After installation, clear emissions codes and verify proper exhaust behavior with diagnostic checks.

Final Thoughts
If your ISB-powered equipment is showing signs of exhaust restriction, emissions alerts, or irregular aftertreatment activity, replacing the DOC is a practical way to restore clean, consistent system function.