Reliable Operation on Route: Gillig Cummins ISL DEF Head Unit
What is it?
The Gillig Cummins ISL DEF Head Unit is a critical part of the SCR system in transit buses using the Cummins ISL engine. It controls DEF dosing while monitoring fluid levels, temperature, and pressure—helping ensure dependable function throughout frequent start-stop driving conditions.
Why choose this OEM DEF Head Unit?
Tailored to work seamlessly with Gillig buses, this OEM unit installs with no special programming or calibration. It helps reduce DEF system faults, low-dose warnings, and unwanted derates that disrupt fleet operation. Trusted by transit operators, it supports smooth SCR function over long service hours.
Key Benefits
✅ Direct connection to Gillig Cummins ISL wiring and control systems
✅ Stable DEF dosing for cleaner operation
✅ Integrated sensors help track real-time system performance
✅ Withstands vibration, heat, and fluid residue
✅ Helps reduce warning lights and in-service interruptions
Applications
Perfect for municipal and regional buses produced by Gillig that run Cummins ISL engines. This DEF Head Unit supports system consistency through city routes, bus stops, and continuous operation.
Installation Notes
Shut off the engine and relieve DEF system pressure before removing old components. Clean electrical and fluid interfaces to avoid contamination. Use existing OEM plugs and verify alignment during installation. Afterward, reset codes and validate performance with a scan tool.
Final Thoughts
If your Gillig bus is showing SCR-related alerts or dosing issues, this OEM DEF Head Unit offers a reliable fix. Designed to match the bus and engine setup exactly, it’s the right fit to keep your route on time—available now at Tamerx.