Built for Environmental Duty: Global Environmental Products Cummins ISL DEF Head Unit
What is it?
The Global Environmental Products (GEP) Cummins ISL DEF Head Unit is a precision emissions control module integral to the SCR (Selective Catalytic Reduction) system in GEP vehicles powered by Cummins ISL engines. It precisely meters Diesel Exhaust Fluid (DEF) into the exhaust flow to neutralize nitrogen oxides (NOx). Equipped with integrated fluid level, temperature, and pressure sensors, it ensures accurate dosing and consistent SCR system operation under demanding conditions.
Why choose the GEP Cummins ISL DEF Head Unit?
Engineered specifically for Global Environmental Products chassis and Cummins ISL engine applications, this OEM-aligned unit offers seamless plug-and-play compatibility with factory wiring and ECM calibration. It avoids compatibility errors, SCR fault codes, and engine derates that can result from aftermarket parts, while providing durable emissions performance in municipal and industrial service cycles.
Key Benefits
✅ Direct-fit OEM compatibility for GEP vehicles using Cummins ISL engines
✅ Precisely controls DEF dosing for maximum NOx reduction and emissions compliance
✅ Built-in sensors monitor fluid level, temperature, and pressure continuously
✅ Designed to resist DEF crystallization, vibration, moisture, and thermal cycling
✅ Helps prevent SCR system faults, limp-mode events, and operational downtime
Applications
Ideal for GEP fleet vehicles including street sweepers, sewer vacuum trucks, stormwater response units, and other environmental service platforms powered by Cummins ISL engines. This unit ensures reliable emissions control during frequent starts, extended idling, and heavy-duty urban operation.
Installation Notes
Before replacing the head unit, disconnect vehicle power and fully depressurize the DEF system. Clean the DEF tank and fluid lines to remove any crystallized residue. Install with OEM connector fittings and secure all fluid and electrical connections firmly. After installation, clear any active diagnostic codes and verify DEF dosing and sensor outputs through a scan tool prior to returning the vehicle to service.
Final Thoughts
When your Global Environmental Products vehicle equipped with a Cummins ISL engine shows DEF system warnings or SCR-related derates, the OEM Cummins ISL DEF Head Unit offers a factory-fit solution built for reliability and regulatory compliance. Engineered for emissions precision and tough-duty application, it restores DEF system functionality and helps keep your fleet running cleanly and efficiently. Available now at Tamerx—trusted parts for trusted service.