What is Komatsu PC800LC-8R Fault Code E01D110KB?

Fault Code E01D110KB indicates a communication error or abnormal signal detected in the machine's main controller network, specifically related to the engine control module (ECM) and pump control system data transmission. This diagnostic trouble code (DTC) appears when the controller area network (CAN) experiences interrupted or corrupted data exchange between critical control units on the PC800LC-8R.

This code is particularly critical for the PC800LC-8R because this model relies on integrated electronic control systems to coordinate engine output with hydraulic pump displacement. When communication fails, the machine cannot properly match hydraulic demand with engine performance, leading to reduced productivity and potential component protection shutdowns.

Common Symptoms

• Warning lamp illumination on the monitor panel with reduced engine power output (derate mode activated)
• Erratic hydraulic response including inconsistent swing speed or boom/arm movement delays
• Intermittent loss of monitor display functions or frozen screen readings showing outdated operational data
• Engine RPM fluctuations under load without operator input changes
• Automatic shutdown to idle or complete engine stop in severe cases to protect drivetrain components

Potential Causes

The most common technical causes for E01D110KB on used PC800LC-8R excavators include:

• Corroded or loose connector pins at the ECM harness junction (C201 connector) behind the operator cab—a known wear point due to vibration exposure
• Damaged CAN bus wiring along the right-hand chassis rail where harness routing creates friction against frame members during operation
• Failed termination resistor in the communication network causing signal reflection and data corruption
• ECM internal fault or corrupted software requiring controller replacement or reprogramming
• Voltage supply issues from the main power distribution harness affecting controller stability (check for voltage drops below 22V on 24V systems)
• Aftermarket monitor installations that improperly tap into CAN lines creating network conflicts

How to Troubleshoot and Fix Code E01D110KB

Step 1: Visual Inspection Inspect all wiring harnesses between the ECM (located under the right-hand access panel) and the pump controller. Look specifically for abraded insulation, corroded connectors, or evidence of previous repairs. On used machines, check the harness support brackets—missing clips allow excessive movement causing wire fatigue.

Step 2: Electrical Testing Using a digital multimeter, verify CAN-High and CAN-Low voltage at the ECM connector. You should measure approximately 2.5V on CAN-High and 2.5V on CAN-Low with key-on, engine-off. Check termination resistance between CAN-High and CAN-Low terminals—should read 60 ohms with all controllers connected. Resistance outside 55-65 ohms indicates termination resistor failure.

Step 3: Diagnostic Software Analysis Connect Komatsu KOMTRAX diagnostic software or compatible scan tool to retrieve freeze-frame data. Check for simultaneous codes that indicate primary failure points. Clear codes and monitor for recurrence during a controlled operational test cycle.

Step 4: Component Verification If wiring tests pass, suspect ECM or pump controller failure. Before replacement, verify battery voltage stability (should maintain above 23V during cranking). On high-hour used excavators, inspect ground connections at the battery tray and frame grounds—corrosion here causes voltage reference problems mimicking controller failures.

Disclaimer: This guide provides general troubleshooting direction. Complex electrical diagnostics should be performed by certified technicians with proper Komatsu diagnostic equipment. Improper repairs may cause additional system damage or safety hazards.