Emergency-Ready Emissions Control: Pierce Cummins ISL DEF Head Unit
What is it?
The Pierce Cummins ISL DEF Head Unit serves as a vital part of the SCR (Selective Catalytic Reduction) system in Pierce fire and rescue apparatus equipped with Cummins ISL diesel engines. It controls DEF injection into the exhaust stream to reduce NOx emissions, while onboard sensors monitor fluid level, temperature, and pressure—ensuring SCR reliability across high-demand operational cycles.
Why choose this OEM DEF Head Unit?
Designed for direct integration with Pierce chassis and Cummins ISL systems, this OEM component plugs into factory ECM wiring with no modifications required. It helps reduce DEF delivery inconsistencies, SCR fault codes, and engine derates often seen with incompatible units. Built for emergency duty, it supports emissions compliance when reliability matters most.
Key Benefits
✅ Direct OEM drop-in fit for Pierce vehicles powered by Cummins ISL
✅ Consistent DEF metering supports emissions compliance
✅ Real‑time sensor monitoring of fluid level, temperature, and pressure
✅ Designed to withstand vibration, thermal stress, moisture, and DEF crystallization
✅ Reduces SCR fault codes, limp-mode events, and mission-critical downtime
Applications
Frequently installed in Pierce aerials, pumpers, rescue units, and command/support vehicles equipped with Cummins ISL engines. This DEF Head Unit ensures dependable SCR operation during high-idle cycles, repeated starts, and heavy usage scenarios.
Installation Notes
Prior to installation, power down the vehicle and depressurize the DEF system. Clean the DEF tank and associated connector areas to remove any residue or crystallization. Attach the OEM head unit using factory connectors, securing both fluid lines and electrical connections. Once installed, clear diagnostic codes and confirm proper DEF dosing and sensor outputs using a diagnostic scan tool.
Final Thoughts
If your Pierce Cummins ISL apparatus is experiencing DEF delivery warnings, SCR-related fault codes, or dosing inconsistencies, this OEM DEF Head Unit offers dependable restoration. Designed for emergency-service durability and emissions control, it's ready to keep your fleet operational—available now at Tamerx.