Universal HD Fault Code

Free · no signup

SPN 111 FMI 01

Red Stop Lamp / 30-Second Timed Shutdown

System

Cooling / Engine

Symptom

Red Stop Lamp / 30-Second Timed Shutdown

Diagnosis & fix steps

LOGIC: Engine Coolant Level Below Low Operating Threshold. ACTION: Check coolant level in surge/expansion tank sight glass. Inspect sensor harness connector pins for terminal fretting or coolant wicking. If tank is full, test magnetic reed/capacitive switch continuity; clean scale/corrosion off sensor tip.

Red Seal field insights

Cavitation & Hot Spots: Engine ECM enforces rapid power derate and eventual automatic shutdown to prevent cylinder liner cavitation, localized cylinder head boiling, and cracked liner flanges caused by air pockets in the cooling jacket.

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.

Book an uptime review

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.

Track this across your whole fleet

This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.

Start your free trial

Related Universal HD fault codes

← All Universal HD fault codes