This Detroit coolant temperature high reference documents fault code SPN 110/FMI 0 (Coolant Temperature High) for Detroit DD-series engines across all model years. It reproduces the original TruckFaultCodes.com fault tree, from the first check through the final repair, so the code can be confirmed and worked in the exact order the factory intended. Each step lists the measured value or check and the pass or fail branch that follows, matching the layout used in the source document.
Detroit coolant temperature high troubleshooting overview
The tree first rules out companion codes SPN 110/FMI 3 and FMI 4, then compares coolant inlet and outlet temperatures on a cold engine within 25°F of each other. From there it walks through coolant loss, thermostat operation, radiator and charge-air-cooler blockage, fan-belt slippage, fan-shroud position, hose condition and viscous-fan operation. Follow the checks in sequence and verify the repair before clearing the code and releasing the vehicle.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD-series engines across all model years |
| System / group | DTCs — coolant temperature (MCM2.1) |
| Fault code | SPN 110/FMI 0 |
| Source publication | TruckFaultCodes.com (© 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 110/FMI 0
- Check for companion codes SPN 110/FMI 3 and FMI 4
- Compare coolant inlet and outlet temperatures (cold engine)
- Check for coolant loss and thermostat operation
- Radiator, charge-air-cooler, fan-belt, fan-shroud, hose and viscous-fan checks
Applicable truck models
It applies to Detroit DD-series engines across all model years running the MCM2.1 control system. Always cross-check the reading against any companion codes before condemning a component. For the official product and service literature, visit the Detroit Diesel website.
Who needs this Detroit coolant temperature high manual
Mechanics chasing an overheating complaint who need the sensor-versus-cooling-system decision path in the factory order. It is written for shop use as a quick, printable reference to keep beside a diesel diagnostic tool during the job.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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