Engineered for First Response: E-ONE Cummins ISL DEF Module
What is it?
The E‑ONE Cummins ISL DEF Head Unit is a vital emissions control module integrated into the SCR system of E‑ONE fire apparatus powered by Cummins ISL engines. It ensures precise delivery of Diesel Exhaust Fluid (DEF) into the exhaust stream to neutralize harmful nitrogen oxides (NOx), while onboard sensors monitor DEF fluid level, temperature, and pressure for accurate dosing and SCR system reliability.
Why choose an E‑ONE-specific DEF Head Unit?
Designed for seamless compatibility with E‑ONE chassis and Cummins ISL control systems, this OEM-grade head unit offers plug-and-play installation without calibration issues. By matching factory ECM wiring and mounting standards, it helps prevent SCR fault codes, engine derates, and dosing inconsistencies often encountered with aftermarket alternatives. Built to endure rapid-response operating cycles and demanding duty conditions, it's a trusted emissions solution for emergency vehicles.
Key Benefits
✅ Direct-fit for E‑ONE fire and rescue vehicles powered by Cummins ISL engines
✅ Precise DEF metering to ensure effective NOx reduction
✅ Integrated sensors continuously monitor fluid level, temperature, and pressure
✅ Engineered to resist DEF crystallization, vibration, heat, and moisture
✅ Helps avoid SCR-related fault codes, limp-mode behavior, and emissions system failures
Applications
Specifically designed for E‑ONE apparatus such as pumpers, aerials, tankers, and rescue vehicles powered by Cummins ISL engines. This DEF Head Unit enables safe and compliant emissions operation even under high-demand response cycles and challenging environments.
Installation Notes
Prior to installation, deactivate the vehicle’s electrical system and relieve DEF line pressure. Clean the DEF tank and surrounding fittings to remove residue or crystallized deposits. Mount the head unit using OEM-style connectors and ensure proper seating of fluid and electrical lines. After installation, clear any diagnostic codes and confirm DEF dosing and sensor outputs via a scan tool to verify proper function.
Final Thoughts
If your E‑ONE fire truck is showing SCR or DEF system faults, upgrading to this OEM-compatible DEF Head Unit is a smart move. Designed for precision dosing, emissions compliance, and rugged operation, it restores reliable DEF system function when time matters most. Available now at Tamerx—quality parts for mission-critical performance.