What is Hitachi ZX210K-5G Fault Code 14106-2?

Fault Code 14106-2 indicates a communication error or abnormal signal from the Engine Control Module (ECM) to the machine's main controller on the Hitachi ZX210K-5G excavator. This diagnostic trouble code (DTC) specifically relates to a breakdown in the CAN bus communication network that allows the engine management system to relay critical operating data to the machine's monitoring system.

This code is part of Hitachi's proprietary diagnostic system for the ZX-5G series excavators, which utilize an integrated electronic control architecture. The ECM continuously exchanges information with the main controller regarding engine parameters like RPM, fuel pressure, coolant temperature, and emission control status. When this communication fails or produces irregular signals, the system triggers Code 14106-2 to prevent potential engine damage or operational hazards. For used excavators, this fault is particularly critical because communication failures can mask other underlying engine problems and lead to unexpected shutdowns or reduced machine performance.

Common Symptoms

• Warning lamp illumination on the instrument cluster, often accompanied by a check engine light or communication error indicator
• Engine derating or power reduction mode, limiting the excavator to reduced RPM and hydraulic flow
• Intermittent loss of engine data on the monitor display (blank RPM readings, missing temperature gauges)
• Rough idling or stalling when the communication error disrupts fuel injection timing
• Inability to regenerate the DPF (Diesel Particulate Filter) due to communication breakdown with emission control systems

Potential Causes

The most common technical causes for Code 14106-2 on used ZX210K-5G excavators include:

• Corroded or loose wiring harness connections between the ECM and main controller, particularly at connector points near the engine bay where moisture and vibration accumulate
• Damaged CAN bus wiring caused by harness rubbing against frame components or hydraulic lines—a known wear point on older ZX-5G models near the right-side frame rail
• Faulty ECM or main controller module, often due to internal circuit board degradation in high-hour machines
• Poor ground connections at the ECM mounting points, which can create voltage irregularities in communication signals
• Aftermarket electrical modifications or improperly installed accessories that create electromagnetic interference on the CAN network
• Corroded ECM connector pins, especially on machines operated in marine, mining, or high-humidity environments

How to Troubleshoot and Fix Code 14106-2

Step 1: Perform Visual Harness Inspection Begin by thoroughly inspecting the wiring harness between the engine ECM (located on the right side of the engine block) and the main controller (typically mounted under the cab). Look for obvious signs of chafing, cuts, or connector corrosion. On used excavators, pay special attention to areas where harnesses pass near moving components or sharp edges. Check all connector locks to ensure they're fully seated and not damaged.

Step 2: Test CAN Bus Communication Integrity Using a digital multimeter, measure the resistance between the CAN-High and CAN-Low terminals at the ECM connector (consult your service manual for specific pin locations). You should read approximately 60 ohms with the key off, indicating proper termination resistors. Next, connect Hitachi Dr.EX diagnostic software or a compatible J1939 scan tool to read live CAN bus traffic and identify where the communication breakdown occurs.

Step 3: Inspect Ground Connections and Voltage Supply Verify that the ECM has a solid ground connection by checking continuity between the ECM ground terminal and battery negative. Resistance should be less than 1 ohm. Measure voltage supply to the ECM with the key on—you should see approximately 12-14 volts at the power supply pins. Corroded ground bolts are extremely common on used machines and can create intermittent communication faults.

Step 4: Check for Connector Pin Corrosion Disconnect the main ECM connector and inspect each pin for green corrosion, bent contacts, or moisture intrusion. The 14106-2 code frequently appears on used excavators due to corroded pins in the communication circuit. Clean pins with electrical contact cleaner and apply dielectric grease before reconnecting. If pins are damaged, connector replacement is necessary rather than attempting repairs.

Step 5: Perform Controller Isolation Test If wiring and connections check out, isolate whether the fault lies with the ECM or main controller by swapping with a known good unit (if available) or having the suspected module bench-tested. For used excavators with high hours (over 8,000), ECM internal failures become more likely due to thermal cycling and vibration stress on circuit boards.

Important for Used Equipment: Before replacing any modules, thoroughly clean all connectors with CRC electrical cleaner and check for previous repair attempts or aftermarket wiring splices that may have been improperly executed. Many used excavators have hidden electrical modifications that cause communication issues.

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Disclaimer: This guide provides general troubleshooting information for Code 14106-2. Always consult the official Hitachi service manual for your specific machine serial number and software version. If you're uncomfortable working with electronic control systems or lack proper diagnostic tools, contact a certified Hitachi technician or qualified heavy equipment mechanic to prevent further damage to expensive electronic components.