Emissions Control for Cummins ISL — OEM DEF Head Unit (GS329564)
What is it?
The OEM GS329564 DEF Head Unit is a factory-grade header assembly designed for Global Environmental Products (GEP) integration with Cummins ISL engines. This component mounts on the DEF (Diesel Exhaust Fluid) tank and houses sensors that monitor fluid level, temperature, and help regulate DEF dosing to support proper SCR (Selective Catalytic Reduction) system function.
Why choose this OEM DEF Head Unit?
Manufactured to original specification standards, this head unit ensures precise sensor calibration, effective sealing, and compatibility with engine control systems. Choosing the genuine component helps avoid DEF sensor errors, leaks, erratic readings, or SCR system disruptions that often arise with aftermarket or non‑OEM alternatives.
Key Benefits
✅ Drop‑in fit for GEP Cummins ISL DEF systems
✅ Accurate monitoring of DEF fluid level and temperature
✅ Proper sealing to prevent leaks and maintain fluid quality
✅ Full compatibility with factory SCR diagnostics and control
✅ Built for durability under thermal cycling and vibration
Applications
Used in Cummins ISL engines with Global Environmental Products DEF integration. Common in fleet trucks, municipal service vehicles, buses, and vocational equipment where reliable emissions control is essential.
Installation Notes
Installation should be done by a qualified technician. First, depressurize or disable the DEF system to prevent spills or sensor damage. Clean the tank opening and inspect mounting surfaces for wear. Replace any worn O‑rings or gaskets. Install the head unit and torque it to OEM specifications. Afterward, verify sensor outputs using diagnostic tools, inspect for leaks, and clear any related fault codes to confirm proper SCR system behavior.
Final Thoughts
If your DEF system is giving warnings, erratic readings, or you’re performing maintenance on the SCR system in a Cummins ISL engine, the OEM GS329564 DEF Head Unit is the precise solution to restore accurate monitoring and emissions reliability. With factory-level quality, it helps keep your system compliant and dependable over time.