Common Fault Codes on Caterpillar 320D / 320LC Excavators and How to Fix Them


The Caterpillar 320 series, including 320D and 320LC models, is one of the most popular hydraulic excavators in the used equipment market. Understanding common fault codes helps operators and buyers maintain these machines efficiently and avoid costly repairs.

Common Fault Codes

  • E0100 – ECM Communication Fault: Check wiring and CAN bus connectivity.

  • E0088 – Engine Coolant Temp Sensor Fault: Inspect and replace faulty sensor or wiring.

  • E0195 – Engine Speed Sensor Fault: Test sensor alignment and replace if necessary.

  • E0031 – Low Fuel Pressure: Inspect fuel filters, lines, and pump.

  • E0201 – Turbocharger Boost Pressure Fault: Examine turbo, hoses, and pressure sensor.

  • E0041 – Fuel Injector Circuit Fault: Verify injector wiring and replace faulty injector.

  • E0274 – Hydraulic Oil Temperature Sensor Fault: Test sensor and wiring.

  • E0312 – Low Hydraulic System Pressure: Inspect pump, valves, and hydraulic lines.

Troubleshooting Tips

  • Use Cat Electronic Technician (ET) for accurate fault detection.

  • Perform visual inspections on sensors, wiring, and connectors.

  • Clear codes after repair and test machine under normal working conditions.

Maintenance Best Practices

  • Regularly maintain coolant, hydraulic, and fuel systems.

  • Train operators to read and report fault codes promptly.

  • Always check fault code history before purchasing a used Cat 320.

CTA

Keep your Caterpillar 320D / 320LC running smoothly. Inspect, maintain, and address fault codes early to ensure long-term performance and reliability.

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