What is Doosan DX220LC-9C Fault Code E000108-03?

Fault Code E000108-03 indicates a communication error between the Engine Control Module (ECM) and the Main Control Unit (MCU) on the Doosan DX220LC-9C excavator. This diagnostic trouble code specifically signals that the CAN bus communication link between these two critical control systems has experienced an intermittent or complete failure, preventing proper data exchange between the engine management system and the machine's hydraulic control systems.

This fault is particularly critical for the DX220LC-9C because the ECM and MCU must communicate continuously to coordinate engine power output with hydraulic demand. When this communication breaks down, the excavator's intelligent control systems cannot optimize fuel efficiency, manage load sensing, or protect the engine from over-stress conditions. The DX220LC-9C's advanced hydraulic system relies on real-time data sharing between these modules to deliver the smooth, responsive control this model is known for.

Common Symptoms

• Engine derate mode activates, limiting maximum RPM to approximately 1,500-1,800 RPM to protect the machine
• Multiple warning lights illuminate simultaneously on the instrument cluster, including the engine warning lamp and system malfunction indicator
• Erratic hydraulic response or loss of fine control due to the MCU operating in failsafe mode without engine feedback
• Intermittent loss of power or hesitation during combined functions (swing plus boom operation)
• Display screen errors showing communication failure messages or blank screens on the monitor panel

Potential Causes

The E000108-03 code in used DX220LC-9C excavators typically stems from:

• CAN bus wiring harness damage between the ECM (located near the engine) and MCU (in the operator cab), particularly at known rub points near the swing bearing and along the right-hand chassis rail
• Corroded or loose connectors at the 24-pin ECM connector or the MCU interface plug, common in machines with 5,000+ operating hours
• Failed termination resistors on the CAN bus network (120-ohm resistors at each network end)
• ECM or MCU internal failure, though less common than wiring issues in used equipment
• Low voltage conditions or poor grounding affecting communication signal integrity
• Aftermarket component interference from improperly installed accessories that disrupt CAN bus signals

How to Troubleshoot and Fix Code E000108-03

Step 1: Visual Harness Inspection Begin by thoroughly inspecting the CAN bus wiring harness from the ECM to the MCU. On the DX220LC-9C, pay special attention to the harness routing near the swing bearing where cables pass through the center joint. Look for chafing, pinched wires, or damage from rubbing against the chassis. Check all connector boots for cracks, moisture intrusion, or corrosion—used excavators often develop corrosion in these connections after years of exposure.

Step 2: Electrical Testing with Diagnostic Tools Using a digital multimeter, measure the CAN-High and CAN-Low resistance between the ECM and MCU. With the ignition off and connectors attached, you should read approximately 60 ohms between CAN-High and CAN-Low (indicating two 120-ohm termination resistors in parallel). Disconnect both modules and verify each termination resistor individually reads 120 ohms. Use Doosan DMS (Diagnostic Master Software) or compatible diagnostic software to monitor real-time CAN bus activity and identify whether communication dropouts are intermittent or constant.

Step 3: Connector Service and Ground Verification Disconnect and clean all CAN bus connectors using electrical contact cleaner. Apply dielectric grease to prevent future corrosion—critical for used machines. Inspect connector pins for bent or recessed terminals. Verify the ground connections at both the ECM and MCU are tight and free of corrosion; poor grounding is a frequent cause of communication errors in older excavators. Check battery voltage under load—communication errors can occur if voltage drops below 22 volts during cranking or heavy electrical loads.

Step 4: Component Replacement and Verification If wiring and connections test good, the issue likely resides in the ECM or MCU. Replace the faulty module using genuine Doosan parts, as aftermarket controllers may have CAN bus compatibility issues. After replacement, use the DMS software to clear codes and verify proper communication. Monitor the machine through several operating cycles to ensure the fault doesn't return.

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Disclaimer: This guide provides general troubleshooting information for the Doosan DX220LC-9C. Always consult the official Doosan service manual for your specific machine serial number. If you're uncomfortable performing electrical diagnostics, contact a certified Doosan technician or qualified heavy equipment repair facility to prevent further damage to electronic control systems.