Route-Proven Emissions Solution: Holland Bus Cummins ISB 6.7 L DEF Head Unit
What is it?
The Holland Bus Cummins ISB 6.7 L DEF Head Unit is an essential component of the SCR (Selective Catalytic Reduction) system in Holland transit and shuttle buses powered by Cummins ISB 6.7 L engines. It controls the delivery of Diesel Exhaust Fluid (DEF) to reduce nitrogen oxide (NOx) emissions, while sensors constantly monitor fluid level, temperature, and pressure to help maintain emission compliance and consistent system performance throughout busy route cycles.
Why choose the Holland Bus DEF Head Unit?
Matched to Holland Bus chassis with Cummins ISB integration, this OEM unit connects directly into the factory ECM wiring—no need for adapter harnesses or recalibration. It helps eliminate dosing inconsistencies, SCR system alerts, and engine derates often seen with non-OEM alternatives. Designed for frequent stops, high dwell times, and urban transit use, it supports uptime and emissions reliability for passenger fleets.
Key Benefits
✅ OEM drop-in fit for Holland Bus vehicles using Cummins ISB 6.7 L
✅ Smooth DEF metering supports clean emissions control
✅ Embedded sensors handle fluid level, temperature, and pressure monitoring in real time
✅ Cross-traffic ready—resists vibration, temperature swings, moisture, and DEF crystallization
✅ Helps prevent fault codes, limp-mode events, and route disruptions
Applications
Perfect for Holland Bus city, airport shuttle, and regional transit units powered by Cummins ISB 6.7 L engines. This DEF Head Unit supports SCR consistency during stop-and-go schedules, heavy idle time, and long-duty routes in varied climates.
Installation Notes
Before servicing, disconnect vehicle power and relieve DEF system pressure. Clean the DEF tank and connections to remove residue or crystallization. Install the replacement using OEM connector fittings, ensuring all fluid lines and electrical plugs are secure. After installation, clear any fault codes and verify DEF metering and sensor output with a diagnostic scan tool.
Final Thoughts
If your Holland Bus shows DEF faults, SCR-related malfunctions, or inconsistent dosing, this Cummins ISB 6.7 L DEF Head Unit is the OEM solution to restore emissions compliance and operational efficiency. Route-ready and reliability-proven—available now from Tamerx.