Cummins ISB DOC

Emission Support Module: Cummins ISB DOC

What is it?
The Diesel Oxidation Catalyst (DOC) designed for the Cummins ISB engine is a key part of the exhaust after-treatment system. Its role is to oxidize hydrocarbons (HC) and carbon monoxide (CO), helping transform more harmful exhaust gases into cleaner forms before they proceed to the DPF or SCR system. 

Why Choose the Cummins ISB DOC?
This DOC is built to meet the specific requirements and exhaust geometry of the ISB engine series. By choosing a part that matches the engine’s specifications, you help ensure proper exhaust flow, correct sensor integration, and better system performance — reducing the risk of filter or catalyst issues and avoiding excessive back-pressure. 

Key Benefits
✅ Direct-fit design aligned with ISB engine mounting and sensor ports.
✅ Durable construction to handle high exhaust temperatures, soot loads and heavy-duty cycles.
✅ Efficient conversion of HC and CO for cleaner emissions output.
✅ Helps reduce emissions system fault codes and downtime associated with improper exhaust treatment.
✅ Supports downstream after-treatment components by improving exhaust conditions entering the DPF or SCR.

Applications
This DOC is intended for medium to heavy-duty trucks and equipment powered by the Cummins ISB engine. It’s especially relevant where reliable emissions control, system integrity and dependable operation are required.

Installation Notes
Installation should be performed by a trained technician. First, verify engine compatibility and confirm that the part you're installing matches the correct ISB model. Remove the old DOC, inspect exhaust flanges, clamps and sensor wiring, clean all mating surfaces thoroughly, replace any worn gaskets or mounting hardware, and install the new DOC with correct torque specifications. Reconnect sensors and wiring, clear any diagnostic codes, then run the engine while monitoring exhaust temperatures, flow and sensor signals to ensure proper operation.

Final Thoughts
A properly functioning DOC is integral to maintaining the health and performance of your exhaust after-treatment system. The Cummins ISB DOC delivers the correct fit and oxidation capability to help your engine remain compliant, reliable and efficient under demanding conditions.