Cummins ISB 6.7L, B6.7 DEF Head Unit 2014-2015: OEM 04-37613-000

DEF Tank Sensor & Supply Module for Cummins ISB 6.7L & B6.7 (2014–2015)

What is it?
The Cummins ISB 6.7L / B6.7 DEF Head Unit, identified by OEM 04-37613-000, is a tank-mounted component that manages both monitoring and delivery of Diesel Exhaust Fluid (DEF). Designed for engines produced between 2014 and 2015, this unit combines multiple functions into a single assembly, including fluid level sensing, temperature tracking, and DEF supply to the aftertreatment system.

It serves as the connection point between the DEF tank and the rest of the emissions system, ensuring that fluid is properly measured and delivered when needed.

Why choose this DEF Head Unit?
The DEF system depends on accurate readings and consistent fluid movement to maintain emissions control. The OEM 04-37613-000 unit is built for Cummins ISB 6.7L and B6.7 platforms, helping ensure proper communication between the tank and the engine control module (ECM).

This component continuously monitors DEF quality, temperature, and level, sending real-time data to the ECM so the system can adjust dosing as needed.

If the unit fails or sends incorrect data, it can lead to warning lights, improper DEF dosing, or even engine derate conditions. Replacing it helps restore accurate system feedback and consistent fluid delivery.

Key Benefits
✅ OEM-matched DEF head unit for Cummins ISB 6.7L and B6.7 engines
✅ Monitors DEF level, temperature, and fluid condition
✅ Supports steady DEF supply to the SCR system
✅ Helps maintain proper communication with the ECM
✅ Direct-fit design for secure tank installation

Applications
This DEF head unit is used on diesel engines equipped with Cummins ISB 6.7L and B6.7 platforms manufactured from 2014 through 2015. These engines are commonly found in medium-duty trucks, buses, and commercial vehicles that rely on SCR systems for emissions compliance.

Installation Notes
Before starting service, ensure the DEF tank is at a safe level. Disconnect the electrical connections and carefully remove the existing unit from the tank. Inspect seals, connectors, and the tank opening for residue or contamination. Install the replacement unit with proper sealing to prevent leaks, reconnect all wiring, and verify system readings using diagnostic tools.

Final Thoughts
Accurate DEF monitoring and delivery are essential for maintaining emissions system function. The Cummins DEF Head Unit (OEM 04-37613-000) helps ensure proper fluid management and system communication, supporting consistent SCR operation and dependable engine performance.