Transit-Tough, Emissions-Verified: Gillig Cummins ISB 6.7 L DEF Head Unit
What is it?
The Gillig Cummins ISB 6.7 L DEF Head Unit is an SCR (Selective Catalytic Reduction) emissions control component engineered for Gillig transit buses equipped with Cummins ISB 6.7 L engines. It delivers precise DEF metering into the exhaust stream to reduce nitrogen oxide (NOx) emissions, with onboard sensors monitoring fluid level, pressure, and temperature for dependable dosing and system integrity throughout demanding transit routes.
Why choose this Gillig DEF Head Unit?
Built specifically for Gillig chassis and Cummins ISB engine systems, this OEM-grade head unit offers perfect plug-and-play compatibility with factory ECM calibration and wiring infrastructure. It prevents DEF dosing inconsistencies, SCR fault codes, and engine derates that may arise from aftermarket replacements. Designed for mass transit schedules, it delivers emissions compliance with consistency, even during frequent stop-and-go operation and long idle cycles.
Key Benefits
✅ Direct OEM fit for Gillig buses running Cummins ISB 6.7 L engines
✅ Precision-controlled DEF dosing ensures optimal NOx reduction
✅ Real-time DEF level, temperature, and pressure monitoring from onboard sensors
✅ Engineered to resist DEF crystallization, thermal cycling, vibration, and moisture
✅ Minimizes risk of SCR fault codes, limp-mode events, and unplanned downtime
Applications
Ideal for Gillig transit buses—such as LF, BRT, or Low-Floor models—powered by Cummins ISB 6.7 L engines. This unit supports reliable emissions system performance during frequent dwell times, boarding cycles, and heavy-duty regional or city transit routes.
Installation Notes
Before installing, turn off power and relieve DEF system pressure. Clean the DEF tank and line connections thoroughly to remove residue or crystallization. Mount the new head unit using OEM-standard connectors, making sure all fluid and electrical connections are securely fastened. After installation, clear any fault codes and verify correct DEF dosing and sensor functionality using a diagnostic scan tool.
Final Thoughts
If your Gillig bus begins alerting DEF system errors, experiences delay-related SCR faults, or shows inconsistent DEF flow, this Cummins ISB–designed DEF Head Unit is the dependable OEM solution. Built for precision transit operation and emissions reliability, it ensures compliant performance—available now from Tamerx.