Pierce Cummins ISL DEF Head Unit

Accurate DEF Control for Pierce / Cummins ISL – OEM DEF Head Unit (1454713)

What is it?
The OEM 1454713 DEF Head Unit is a factory-engineered header assembly for Cummins ISL engines fitted in Pierce vehicles. It mounts on the DEF tank and houses components such as fluid level and temperature sensors, helping maintain DEF system integrity and support proper SCR emissions control.

Why choose this OEM DEF Head Unit?
This head unit is manufactured to meet Pierces' and Cummins’ rigorous OEM specifications. It offers a direct, no-modification-required fit, correct sensor calibration, and reliable sealing—reducing the risk of DEF leaks, warning codes, and inconsistent emissions system behavior that often come with aftermarket units.

Key Benefits
 ✅ Exact fitment for Pierce Cummins ISL EFI DEF systems
 ✅ Factory‑calibrated sensors ensure reliable DEF level and temperature readings
 ✅ OEM sealing and housing integrity reduce leaks and exposure to external contaminants
 ✅ Helps maintain SCR system functionality and avoid diagnostic faults
 ✅ Durable build suited for heavy-duty service environments 

Applications
Used in Pierce fire trucks, rescue vehicles, and other apparatus equipped with Cummins ISL engines that incorporate DEF-equipped emission control systems. This head unit is essential when replacing or servicing the DEF system in such vehicles to ensure compliance and consistent performance. 

Installation Notes
Have the DEF system drained or de‑pressurized before removal. Clean tank opening surfaces, replace O‑rings or gaskets, and install the head unit according to OEM torque specifications. Once installed, verify sensor outputs, DEF level readings, and clear any active DEF‑related engine codes. 

Final Thoughts
If your Pierce Cummins ISL vehicle is experiencing DEF-level irregularities, system warning lights, or emission control issues, the OEM 1454713 DEF Head Unit offers a reliable, spec‑matched replacement. Designed for durability and precision, it restores DEF system operation with factory confidence.