Precision Emissions for Transit Duty: Gillig Cummins ISB 6.7 L DEF Head Unit
What is it?
The Gillig Cummins ISB 6.7 L DEF Head Unit is a specialized emissions control module integrated into the SCR (Selective Catalytic Reduction) system of transit buses powered by Cummins ISB 6.7 L engines. It precisely meters Diesel Exhaust Fluid (DEF) into the exhaust stream to reduce nitrogen oxide (NOx) emissions, while built-in sensors continuously monitor fluid level, temperature, and pressure—ensuring accurate DEF delivery and consistent system function across daily routes.
Why choose the Gillig-designed DEF Head Unit?
Custom-engineered for Gillig chassis with Cummins ISB powertrains, this OEM-grade module offers plug-and-play installation with factory ECM logic and harness compatibility. It eliminates DEF dosing inconsistencies, SCR fault codes, and engine derates commonly caused by mismatched aftermarket parts. Designed for high idle cycles, frequent stop-starts, and heavy route demands—it delivers emissions control reliability where service uptime is essential.
Key Benefits
✅ OEM-fit for Gillig transit buses with Cummins ISB 6.7 L engines
✅ Precisely regulates DEF dosing for maximum NOx reduction
✅ Integrated sensors deliver real-time tracking of fluid level, temperature, and pressure
✅ Constructed to resist DEF crystallization, thermal fluctuations, vibration, and moisture
✅ Helps prevent SCR error codes, limp-mode events, and emissions system interruptions
Applications
Ideal for Gillig transit fleet vehicles equipped with Cummins ISB 6.7 L engines—commonly used in city, commuter, and regional bus service. This DEF Head Unit ensures emissions compliance and SCR performance across frequent route cycles, high idle time, and mixed-traffic operations.
Installation Notes
Before service, disconnect bus power and relieve DEF system pressure. Clean the DEF tank and associated lines thoroughly to remove any residue or crystallization. Mount the new head unit using OEM connectors, ensuring all fluid and electrical lines are firmly secured. Once installed, clear diagnostic codes and verify proper DEF dosing and sensor performance using a diagnostic scan tool.
Final Thoughts
If your Gillig bus powered by a Cummins ISB 6.7 L engine is displaying DEF system alerts, dosing errors, or emissions fault codes, this OEM Gillig DEF Head Unit is the reliable fix. Engineered for transit-specific demands—plug‑and‑play fit, rugged operation, and long-term compliance—all available now at Tamerx.