What is Doosan Excavator Fault Code E000105-09?

Doosan fault code E000105-09 indicates a received network message error on the CAN (Controller Area Network) bus communication system — specifically, an invalid or missing data message received by the main ECM (Engine Control Module) from a connected control unit.

This fault falls under SAE J1939 diagnostic standards, where the "09" failure mode identifier (FMI) signals an abnormal update rate — meaning a required CAN message is not arriving at the expected frequency or is arriving corrupted. On Doosan excavators, this directly impacts coordinated communication between the engine ECM, pump controller, and main machine controller (MCU), which are all interdependent for safe, efficient operation.

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Common Symptoms

• Warning lamp illumination on the cluster display with active fault logging
• Engine power derate or unexpected RPM limitation during operation
• Erratic hydraulic response — delayed or inconsistent boom, arm, or swing movements
• Machine entering limp-home mode, restricting work capacity
• Intermittent fault code resets that return under load or vibration

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Potential Causes

• Damaged or corroded CAN bus wiring harness — especially common on used machines with high hours
• Loose or oxidized connector pins at the ECM, MCU, or pump controller junction blocks
• Terminating resistor failure — the CAN network requires 120-ohm resistors at each end; failure disrupts all communication
• Failed or failing control module (ECM or MCU) transmitting corrupt data frames
• Aftermarket accessories or improper repairs that introduced incorrect wiring into the CAN network

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How to Troubleshoot and Fix Code E000105-09

Step 1 — Connect Diagnostic Software Use Doosan Diagnostic System (DDS) or an equivalent J1939-compatible scan tool to confirm the active fault, identify which node is failing to communicate, and check for related codes that may point to a specific controller.

Step 2 — Inspect the CAN Bus Harness On used excavators, physically trace the CAN High and CAN Low wiring (typically a twisted pair) from the ECM to the MCU and pump controller. Look for harness chafing against frame edges, heat shield damage near the engine bay, and green or white corrosion on connector pins. Clean connectors with electrical contact cleaner and reseat all terminals.

Step 3 — Test CAN Bus Resistance With the ignition OFF and the harness disconnected from both controllers, use a digital multimeter to measure resistance across the CAN High and CAN Low wires. A healthy network reads approximately 60 ohms (two 120-ohm terminating resistors in parallel). Readings significantly above or below indicate a failed resistor or open/short circuit.

Step 4 — Isolate and Replace If wiring checks out, test each terminating resistor individually (should read 120 ohms each). If resistance is correct, suspect a failing control module and consult Doosan dealer-level diagnostics before replacement.

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Disclaimer: This guide is intended for informational purposes and general diagnostic direction. Always consult a certified Doosan dealer or licensed heavy equipment technician before performing major repairs. Improper repairs to ECM or CAN bus systems can result in further damage or safety hazards.