Universal HD Fault Code
Free · no signupSPN 110 FMI 00
Red Stop Lamp / Engine Fan Locked at 100%
System
Cooling
Symptom
Red Stop Lamp / Engine Fan Locked at 100%
Diagnosis & fix steps
LOGIC: Engine Coolant Temperature Critically High (>106°C / 222°F).
ACTION: Check radiator core for dirt, bugs, or chaff plugging external airflow fins. Inspect viscous fan clutch or pneumatic fan solenoid operation. Test thermostats in hot water bath for full opening travel; check for blown head gasket pumping combustion gas into coolant.
Red Seal field insights
Thermal Shock Failsafe: Severe coolant temperature triggers step-down power cuts and fan locks to prevent cylinder head warpage, cracked valve bridges, and melted piston crowns.
Same code keeps coming back?
That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.
Read before you touch anything
- This is general reference information, not a repair manual. It is for trained, qualified technicians.
- Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
- Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
- You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
- Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.
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