Holland Bus Cummins ISB 6.7L

Engineered for Transit Consistency: 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 a precision-engineered emissions component integrated into the Selective Catalytic Reduction (SCR) system of Holland Bus transit and shuttle vehicles powered by Cummins ISB 6.7 L engines. It delivers accurately metered Diesel Exhaust Fluid (DEF) into the exhaust stream to neutralize nitrogen oxide (NOx) emissions. With sensors monitoring DEF fluid level, temperature, and pressure, it ensures consistent SCR operation throughout high-frequency routes and idle-heavy transit environments.

Why choose the Holland Bus DEF Head Unit?
Built specifically for Holland Bus chassis paired with Cummins ISB engines, this OEM-grade unit offers dependable plug-and-play installation with factory ECM calibration and harness compatibility. It eliminates DEF dosing inconsistencies, SCR fault codes, and engine derates often caused by non-OEM replacements. Designed for the demands of mass transit, it delivers consistent emissions control and system reliability for passenger service routes.

Key Benefits
✅ True OEM fit for Holland transit vehicles with Cummins ISB 6.7 L powertrain
✅ Precisely regulates DEF dosing to optimize NOx reduction
✅ Real-time DEF level, temperature, and pressure monitoring via embedded sensors
✅ Engineered to resist DEF crystallization, vibration, thermal cycling, and moisture
✅ Helps prevent SCR-related errors, limp-mode events, and unscheduled fleet downtime

Applications
Ideal for Holland Bus shuttle coaches, transit units, or specialty platform vehicles powered by Cummins ISB 6.7 L engines. This DEF Head Unit ensures reliable emissions compliance and SCR system performance during frequent stop-start cycles, long dwell times, and daily passenger operation.

Installation Notes
Before installing, power down the vehicle and depressurize the DEF system. Clean the DEF tank and lines thoroughly to eliminate residue or crystal buildup. Install the head unit using OEM connector fittings and ensure all fluid and electrical connections are properly seated. After installation, clear diagnostic trouble codes and verify correct DEF dosing and sensor readings using a diagnostic scan tool.

Final Thoughts
If your Holland Bus vehicle experiences DEF dosing faults, SCR system alerts, or inconsistent performance, the Cummins ISB 6.7 L DEF Head Unit designed specifically for Holland is your OEM-grade solution. Built for transit reliability and emissions precision, it restores compliance and durability—available now at Tamerx.