What is XCMG General Fault Code E1023?

Fault Code E1023 on XCMG excavators indicates a communication error between the Engine Control Module (ECM) and the Hydraulic Control Module (HCM), or a failure in the CAN bus network that connects these critical systems. This code specifically signals that data transmission between the engine management system and hydraulic control system has been interrupted or corrupted, preventing proper coordination between power output and hydraulic functions.

This fault is critical for XCMG excavators because the ECM and HCM must constantly communicate to optimize fuel efficiency, manage engine load, and regulate hydraulic pressure. When communication breaks down, the machine cannot properly match engine power to hydraulic demand, resulting in reduced performance and potential component damage. In used machines, this code often points to deteriorated wiring or connector corrosion rather than module failure.

Common Symptoms

• Erratic hydraulic response with delayed or inconsistent boom, stick, or bucket movements
• Engine warning lamp illuminated on the instrument cluster with possible audible alarm
• Reduced engine power or automatic derate mode limiting RPM to protect the drivetrain
• Intermittent loss of auxiliary hydraulic functions such as breaker or grapple operation
• Dashboard display errors showing communication fault messages or blank hydraulic system readings

Potential Causes

The most common technical causes for E1023 in used XCMG excavators include:

• CAN bus harness damage at flex points near the swing bearing or boom base where repeated movement causes wire chafing
• Corroded or loose connector pins at the ECM or HCM connection points, especially in machines exposed to moisture
• Failed terminating resistors in the CAN network causing signal reflection and data corruption
• Voltage supply issues to either control module due to failing relay or damaged power distribution harness
• ECM or HCM internal failure (less common) typically preceded by exposure to water intrusion or electrical spike damage
• Aftermarket component interference from improperly installed attachments affecting CAN bus integrity

How to Troubleshoot and Fix Code E1023

Step 1: Visual Inspection Begin by thoroughly inspecting the CAN bus wiring harness from the ECM (located near the engine) to the HCM (typically mounted near the hydraulic pump). Focus on known wear points where the harness crosses the swing bearing and along the boom pivot. Look for abraded insulation, pinched wires, or damaged protective conduit. On used excavators, pay special attention to connector boots for cracks that allow moisture penetration.

Step 2: Connector and Resistance Testing Disconnect both ECM and HCM CAN bus connectors and inspect pins for corrosion, bent contacts, or pushed-back terminals. Using a digital multimeter, measure resistance between CAN-High and CAN-Low wires at both ends—you should read approximately 60 ohms with the system powered off, indicating proper terminating resistor function. Check for continuity on each individual wire and verify no shorts to ground (infinite resistance to chassis).

Step 3: Voltage and Module Verification With the key on and engine off, verify supply voltage to both modules (should read 24V on XCMG machines). Use XCMG-specific diagnostic software (XCMG Excavator Diagnostic Tool) connected via the diagnostic port to monitor real-time CAN bus traffic and identify which module is failing to transmit. If wiring tests pass but communication remains absent, suspect internal module failure—though in used equipment, re-seating connectors and applying dielectric grease often resolves intermittent issues caused by vibration and environmental exposure.

Step 4: Repair and Verification Replace damaged harness sections using proper CAN bus rated cable (twisted pair, shielded), ensuring connections are soldered and heat-shrunk rather than crimped for used-machine durability. Clear the fault code and perform a full operational test under load, monitoring for code recurrence during swing and boom movements.

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Disclaimer: This guide provides general troubleshooting information for XCMG fault code E1023. Always consult the specific service manual for your machine model and serial number. If you lack experience with electrical diagnostics or CAN bus systems, consult a qualified XCMG technician to avoid further damage to electronic control modules.