Precision Emissions Mastery: CMI Cummins ISB 6.7L DEF Head Unit
What is it?
The CMI Cummins ISB 6.7L DEF Head Unit is a critical emissions system component installed on CMI chassis platforms powered by Cummins ISB 6.7L engines. This module accurately meters and injects Diesel Exhaust Fluid (DEF) into the exhaust stream to neutralize nitrogen oxide (NOx) emissions while monitoring fluid level, temperature, and pressure for consistent SCR performance.
Why choose the CMI Cummins DEF Head Unit?
Engineered specifically for CMI applications with Cummins ISB 6.7L engines, this DEF Head Unit ensures seamless integration with factory ECM calibration and chassis wiring. Providing reliable DEF dosing tuned for CMI vehicle profiles, it helps avoid SCR fault codes, limp-mode derates, and emissions system downtime inherent to mismatched or aftermarket parts.
Key Benefits
✅ Direct-fit solution for CMI chassis with Cummins ISB 6.7L engines
✅ Precisely regulates DEF dosing for optimal NOx reduction
✅ Integrated sensors continuously monitor fluid level, pressure, and temperature
✅ Built to resist DEF crystallization, vibration, and harsh environmental exposure
✅ Helps prevent SCR-related errors, performance derates, and diagnostic failures
Applications
Designed for CMI-manufactured vehicles equipped with Cummins ISB 6.7L engines—such as service bodies, vocational fleets, municipal platforms, and speciality utility vehicles. This DEF Head Unit supports consistent emissions system functionality during demanding duty cycles and frequent stop-start operation.
Installation Notes
Begin by disconnecting battery power and depressurizing the DEF system. Clean the DEF tank and connections thoroughly to avoid contamination. Install the replacement head unit using OEM-style connectors and hardware, making sure all sensors and fluid lines are properly seated. Once complete, clear fault codes and verify sensor readings and DEF flow using a diagnostic tool to ensure proper operation.
Final Thoughts
If your CMI Cummins ISB 6.7L vehicle is experiencing DEF system malfunctions or SCR-related derates, the OEM-compatible DEF Head Unit is an excellent fix. Built for compatibility, precision, and long-term durability, it restores proper DEF dosing and emissions compliance—available now at Tamerx to keep your fleet running clean and reliably.