Sany Fault Code

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SPN 520220 FMI 04

Hydraulic Temp Gauge Pinned / False Warning

System

Hydraulics / Thermal

Symptom

Hydraulic Temp Gauge Pinned / False Warning

Diagnosis & fix steps

LOGIC: Hydraulic Oil Temperature Sensor Circuit Low (Short to Ground). ACTION: Disconnect hydraulic temperature sensor on the reservoir tank. Measure internal thermistor resistance (spec: ~2.5kΩ at 20°C). Inspect wiring harness for rub-through against tank sheet metal.

Red Seal field insights

Thermal Failsafe: Shorted signal wire drops voltage to 0V; the controller assumes critical fluid overheating (>110°C) and locks the engine into a continuous Level 2 derate.

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.

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