On-Demand DEF Control for Thomas Bus Detroit DD5 & DD8 Engine Platforms
What is it?
The Thomas Bus Detroit DD5/DD8 DEF Head Unit manages DEF flow and system monitoring for buses powered by Detroit Diesel DD5 or DD8 engines. It meters DEF into the exhaust stream while sensors track fluid level, temperature, and pressure—ensuring accurate function during daily transit cycles.
Why choose this OEM DEF Head Unit?
Designed for seamless integration with Thomas Bus wiring and Detroit ECM systems, this OEM unit plugs directly into existing harnesses—no recalibration needed. It helps avoid DEF delivery faults, warning codes, and unwanted engine derates associated with aftermarket parts.
Key Benefits
✅ OEM plug-in replacement for Thomas Bus equipped with Detroit DD5 or DD8 powertrains
✅ Maintains DEF flow for consistent SCR operation and reduced system faults
✅ Real-time sensor feedback on fluid level, temperature, and pressure
✅ Durable against vibration, temperature swings, moisture, and DEF build-up
✅ Helps minimize system alerts and unscheduled disruptions
Applications
Perfect for Thomas school buses, transit shuttles, and fleet vehicles using Detroit DD5 or DD8 engines. This DEF Head Unit supports dependable dosing across rigorous route schedules and varied road conditions.
Installation Notes
Switch off power and relieve DEF pressure before starting. Clean the reservoir and connector areas to avoid foreign particles. Install the OEM-head unit using factory connectors and make sure all plugs and fluid lines are properly secured. Afterward, clear system fault codes and verify sensor feedback using a scan tool.
Final Thoughts
If your Thomas Bus equipped with a Detroit DD5 or DD8 engine experiences DEF dosing issues, warning codes, or operational interruptions, this OEM DEF Head Unit is the direct fix you need. Designed for transit work cycles and day-to-day reliability—available now from Tamerx.