LGMG Fault Code

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SPN 520230 FMI 02

Machine Drags Brakes / Parking Lamp Solid

System

Braking / Park

Symptom

Machine Drags Brakes / Parking Lamp Solid

Diagnosis & fix steps

LOGIC: Parking Brake Pressure Switch Signal Inconsistent. ACTION: Measure pressure at the parking brake release chamber. Test the 2-wire pressure switch mounted on the handbrake control valve block; trace harness for rock strikes along the rear chassis rail.

Red Seal field insights

Drag Failure: If the parking brake pneumatic or hydraulic release valve fails to deliver full release pressure, the pressure switch remains closed, keeping transmission interlocks active to prevent roasted linings.

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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