LGCM Fault Code

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E03 / SPN 168 FMI 01

Display Flickers / Hard Cranking

System

Electrical / Charging

Symptom

Display Flickers / Hard Cranking

Diagnosis & fix steps

LOGIC: System Battery Supply Voltage Low (<10.5V on 12V bus). ACTION: Test battery cold-cranking voltage under load. Inspect main battery ground cable bolted to the painted chassis frame (scrape paint to bare metal); check alternator belt tension and charging voltage (>13.8V).

Red Seal field insights

Painted Ground Studs: Factory assembly often bolts ground eyelets straight over thick frame paint, creating high-resistance circuits that drop bus voltage under starter draw.

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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