What is Komatsu PC160LC-7 Fault Code E213?

Komatsu PC160LC-7 fault code E213 indicates a malfunction in the Machine Control System (MCS) communication circuit, specifically a CAN (Controller Area Network) communication error between the engine controller (ECM) and the machine controller. This code triggers when the machine's main controller fails to receive proper signals from the engine control unit within the expected timeframe.

The CAN bus system on the PC160LC-7 coordinates critical functions between the engine, hydraulic system, and operator interface. When communication breaks down, the excavator cannot properly synchronize engine output with hydraulic demands, leading to reduced productivity and potential safety concerns. This fault is particularly critical because it affects the machine's ability to automatically adjust engine speed and power delivery based on load conditions—a key feature for fuel efficiency and smooth operation.

Common Symptoms

• Warning light illuminated on the monitor panel, often accompanied by a "CHECK" or "ENGINE" indicator
• Erratic engine behavior, including unexpected throttle changes or failure to respond to joystick inputs
• Reduced hydraulic power or sluggish boom/arm movement despite normal engine RPM
• Intermittent loss of monitoring functions, such as fuel gauge, hour meter, or temperature readings becoming unresponsive
• Engine may enter derate mode, limiting RPM to protect the machine when communication is completely lost

Potential Causes

The most common causes of E213 on used PC160LC-7 excavators include:

• Damaged or corroded CAN bus wiring harness, particularly near flex points around the engine mounts, cab pivot, or under the operator platform where cables experience repeated bending
• Faulty ECM or machine controller connectors, especially the 24-pin connector on the engine controller known for pin corrosion in machines operating in wet or dusty environments
• Failed termination resistors on the CAN network (typically 120-ohm resistors at each end of the bus)
• Voltage fluctuations from a weak battery, failing alternator, or poor ground connections affecting controller power supply
• ECM or machine controller internal failure, though less common than wiring issues in used equipment
• Water intrusion into controller housings from damaged seals or cab leaks

How to Troubleshoot and Fix Code E213

Step 1: Visual Inspection of Wiring and Connectors Begin by inspecting the CAN bus harness from the ECM (located on the right side of the engine) to the machine controller (under the cab floor). Look for abraded insulation at harness routing clamps, especially where cables pass through the engine compartment firewall. On used excavators, check for oil contamination or UV damage to wire insulation. Disconnect the main ECM connector and inspect pins for bent contacts, green corrosion, or moisture—clean with electrical contact cleaner if needed.

Step 2: Test CAN Bus Integrity Using a multimeter, measure resistance between the CAN-High and CAN-Low wires (typically yellow and green wires in Komatsu harnesses) with all controllers disconnected. You should read approximately 60 ohms, indicating both 120-ohm termination resistors are intact. If you measure 120 ohms, one terminator has failed; infinite resistance means an open circuit in the wiring. Check for continuity on each CAN wire individually from ECM to machine controller to locate breaks.

Step 3: Verify Power Supply and Grounds Confirm the ECM and machine controller receive stable 24V power (engine running) and proper ground connections. Check battery voltage under load—weak batteries (below 24V) can cause communication errors. Inspect the ground strap from the engine block to chassis; corrosion here is common on used machines and causes erratic electrical behavior.

Step 4: Advanced Diagnostics with Komatsu Software Connect Komatsu diagnostic software (KOMTRAX or dealer diagnostic tool) to monitor real-time CAN bus activity. This can identify whether the ECM or machine controller is the source of communication failure. For used excavators with unknown service history, check for software version mismatches between controllers—previous repairs may have installed incompatible firmware.

Disclaimer: This guide provides general troubleshooting procedures. CAN bus diagnostics require specialized knowledge and tools. Consult a certified Komatsu technician or authorized dealer for complex electrical issues, especially before replacing expensive controllers. Always disconnect batteries before working on electrical systems.