What is Komatsu PC210LC-8M0 Fault Code DWK2KB?

Fault Code DWK2KB on the Komatsu PC210LC-8M0 indicates a communication error between the machine's Engine Control Module (ECM) and the Hydraulic Control System, specifically related to data link network transmission failure. This diagnostic trouble code (DTC) signals that the Controller Area Network (CAN bus) is experiencing intermittent or complete signal loss between critical control systems.

This fault is particularly significant for the PC210LC-8M0 because this model relies on integrated electronic control for coordinating engine power management with hydraulic demands. When communication breaks down, the machine's ability to optimize fuel efficiency and hydraulic response is severely compromised. The KOMTRAX monitoring system may also fail to log operational data correctly, affecting fleet management and diagnostic capabilities.

Common Symptoms

When DWK2KB is active, operators typically experience:

• Warning lamp illumination on the monitor panel with a diagnostic code displayed
• Reduced engine power or derate mode activation, limiting machine performance to protect systems
• Erratic hydraulic responses including delayed boom, arm, or swing functions
• Intermittent gauge failures where monitor displays freeze, flicker, or show incorrect readings
• Engine may run in limp mode with limited RPM range, significantly reducing productivity

Potential Causes

Several technical failures commonly trigger this code on used PC210LC-8M0 excavators:

• CAN bus wiring harness damage from cable routing near moving components or boom cylinder contact points (common wear area behind the cab)
• Corroded or moisture-contaminated connectors at the ECM or hydraulic controller junction boxes
• Failed terminating resistors on the CAN network causing signal reflection and data corruption
• ECM or hydraulic controller internal faults due to voltage spikes or component aging
• Damaged shielding on communication cables allowing electromagnetic interference from starter circuits or alternator
• Loose or oxidized ground connections at the battery tray or chassis grounding points specific to the -8M0 series

How to Troubleshoot and Fix Code DWK2KB

Step 1: Visual Harness Inspection Begin by physically examining the main wiring harness routing from the ECM (located under the right-hand side panel) to the hydraulic control valve. Look specifically for harness chafing against the battery box mounting bracket and near the swing motor—known friction points on used PC210LC-8M0 models. Check all connector pins for corrosion, bent terminals, or moisture intrusion.

Step 2: Electrical Testing Using a digital multimeter, verify proper CAN bus voltage. With the ignition on (engine off), measure between CAN-High and CAN-Low terminals at the ECM connector (typically pins 23 and 31 on the PC210LC-8M0). You should read approximately 2.5V at rest. Check for 120-ohm terminating resistance across the CAN lines with all modules disconnected—incorrect resistance indicates terminating resistor failure.

Step 3: Communication Testing Connect Komatsu diagnostic software (KOWA07 or equivalent) to verify active communication with both the ECM and hydraulic controller independently. Monitor live data streams while wiggling harnesses to identify intermittent connection failures. For used excavators, pay special attention to connector backside seals which deteriorate over time, allowing moisture intrusion that causes intermittent faults.

Step 4: Ground Circuit Verification Clean and inspect all chassis ground points, particularly the ECM ground near the battery. Measure less than 0.5 ohms resistance to chassis ground. Replace corroded ground straps commonly found on machines with 5,000+ operating hours.

Disclaimer: This technical guide provides general troubleshooting information. Complex electrical diagnostics should be performed by qualified technicians with appropriate Komatsu service manuals and calibrated diagnostic equipment. Always disconnect batteries before performing electrical repairs.