Code Details
| Display code | SPN 110 FMI 0 |
|---|---|
| SPN | 110 |
| FMI | 0 |
| OEM code | None listed |
| Manufacturer | Ford |
| System | Engine �?cooling system |
| Component | Engine coolant temperature sensor / cooling system |
| Source address | Unknown or not applicable |
| Severity | stop safely |
| Review status | source backed |
| Source confidence | medium |
| Last reviewed | 2026-06-11 |
Plain-English Meaning
The Ford 6.7 Power Stroke cooling system keeps combustion heat under control for everything from regular towing to heavy commercial use in F-450 cutaways and work trucks. When coolant temperature exceeds the warning threshold, the heat balance has been disrupted. Prompt investigation of coolant level, thermostat function, and fan engagement is needed to prevent head gasket and head damage.
SPN 110 FMI 0 is Engine Coolant Temperature above normal. On Ford 6.7 Power Stroke PCM calibrations, coolant temperature monitoring is combined with fan clutch control and engine protection logic. Ford IDS (or FORSCAN for owner/tech use) can monitor coolant temperature and commanded fan speed. The 6.7 Power Stroke is a reverse-flow cooling design �?the coolant enters the heads before the block �?which affects thermostat location and diagnosis compared to conventional designs.
Common Symptoms
- High coolant temperature gauge reading
- Coolant temperature warning or wrench light active
- Possible coolant loss from overflow if temperature spike is severe
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Low coolant level from a leak or evaporation
- Thermostat stuck closed
- Radiator plugged with debris
- Fan clutch not engaging or viscous fan not responding
- EGR cooler internal leak
- Water pump failure
First Checks
- Check coolant level in the degas bottle (overflow tank) �?note that the 6.7 Power Stroke uses a reverse-flow system
- Inspect the radiator face for debris and bugs
- Use Ford IDS or FORSCAN to monitor coolant temperature and fan engagement commands
- Check for white or sweet-smelling exhaust suggesting an EGR cooler or head gasket leak
Can I Keep Driving?
Reduce load and stop if temperature continues to rise. The 6.7 Power Stroke is susceptible to head issues if overheated. Do not remove the coolant cap while the engine is hot.
Related Codes
Related Lookup Pages
Sources
- Ford Trucks Service Support Public Resources Ford Motor Company · oem · accessed 2026-06-11 · confidence medium
Source: Ford Motor Company, Ford Trucks Service Support Public Resources. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium
Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
What is the reverse-flow cooling system on the Ford 6.7 Power Stroke, and how does it affect diagnosis?
In a reverse-flow design, coolant enters the cylinder heads first (rather than the block), then flows to the block. This was intended to improve combustion and thermal management. For diagnosis, it means the thermostat and coolant cap are on the cold side of the system. This can cause different pressure and temperature distribution compared to conventional engines �?check the Ford-specific service manual for thermostat location and cooling system bleeding procedures.
Is EGR cooler failure a known issue on the Ford 6.7 Power Stroke?
EGR cooler failures �?causing coolant to leak into the exhaust �?have been reported on 6.7 Power Stroke engines, particularly on earlier production years. Symptoms include unexplained coolant loss, white sweet-smelling exhaust, or coolant level drops without visible external leaks. Ford issued service information updates addressing EGR cooler robustness over the engine's production history.
Can I tow with a Ford F-350 6.7 Power Stroke that shows SPN 110 FMI 0 on occasion?
Occasional high coolant temperature during maximum towing in extreme ambient conditions can be normal if the reading quickly returns to normal after slowing down or stopping. If the temperature warning appears repeatedly during normal towing that the truck previously handled without issue, this indicates a cooling system degradation that should be investigated before resuming heavy towing.