What is Komatsu PC210-10 Fault Code L01DWK2KA?

Fault Code L01DWK2KA indicates a communication error or abnormal signal from the work equipment controller on the Komatsu PC210-10 excavator. This code specifically relates to a disruption in the CAN bus communication network between the machine's main controller (KOMTRAX/ECM) and the work equipment control system, which manages boom, arm, and bucket hydraulic functions.

This fault code is critical because the PC210-10 relies heavily on integrated electronic controls for optimal hydraulic performance and fuel efficiency. When communication breaks down between controllers, the machine may enter a protective derated mode or lose precision control over attachments. For used excavators, this code often surfaces due to degraded wiring harnesses, corroded connectors, or controller failures stemming from environmental exposure over thousands of operating hours.

Common Symptoms

When Code L01DWK2KA is active, operators typically experience:

• Intermittent or complete loss of work equipment control (boom, arm, bucket may become unresponsive or jerky)
• Warning lamp illumination on the monitor panel with fault code displayed
• Reduced hydraulic response or delayed actuator movements
• Machine entering limp mode, limiting engine RPM or hydraulic pressure
• KOMTRAX communication failures, preventing remote monitoring or diagnostics

Potential Causes

The most common technical reasons for this fault code on used PC210-10 excavators include:

• Damaged or corroded CAN bus wiring harness, particularly at flex points near the cabin or boom pivot where cables experience repeated bending
• Failed work equipment controller module due to moisture intrusion or component aging
• Loose or oxidized connector pins at the controller harness plugs (especially C1 and C2 connectors)
• Voltage supply issues to the work equipment controller (typically requires stable 24V DC power)
• ECM software glitches requiring initialization or updates via Komatsu diagnostic software
• Ground circuit failures at chassis grounding points degraded by rust

How to Troubleshoot and Fix Code L01DWK2KA

Step 1: Visual Inspection Begin by thoroughly inspecting the work equipment controller harness from the main ECM to the controller unit mounted near the hydraulic pump. Look for abraded insulation, pinched wires at mounting brackets, or green corrosion on connector terminals. On used excavators, pay special attention to harness routing near the swing bearing and boom base where vibration causes wear.

Step 2: Connector and Voltage Testing Disconnect the work equipment controller connectors and inspect pins for corrosion or bent contacts. Using a digital multimeter, verify 24V DC power supply at the controller power pins with the key on. Check ground continuity (should read less than 1 ohm resistance to chassis ground). Clean all connector pins with electrical contact cleaner and apply dielectric grease.

Step 3: CAN Bus Communication Check Using Komatsu KEPAS diagnostic software or a compatible CAN bus scanner, monitor communication status between controllers. Check CAN High and CAN Low voltage levels (should read approximately 2.5V at rest, oscillating between 1.5V-3.5V during communication). If no communication is detected, test CAN termination resistors (should measure 60 ohms between CAN-H and CAN-L with controllers disconnected).

Step 4: Controller Replacement or Reprogramming If wiring and voltage checks pass but the fault persists, the work equipment controller may require replacement or software reflashing. Before replacing expensive controllers on used machines, attempt an ECM reset by disconnecting the battery for 15 minutes. If replacement is necessary, ensure the new controller is programmed with machine-specific parameters using Komatsu diagnostic tools.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Komatsu PC210-10 service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs may cause further damage or safety hazards.