XCMG XS15 Fault Code 441: Meaning, Symptoms & How to Fix It

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What is XCMG XS15 Fault Code 441?

XCMG XS15 Fault Code 441 indicates a fault in the Engine Coolant Temperature (ECT) Sensor circuit — specifically an out-of-range or implausible signal being received by the Engine Control Module (ECM).

This code is triggered when the ECM detects that the voltage signal from the coolant temperature sensor falls outside the expected operating parameters — either too high (open circuit) or too low (short to ground). On the XCMG XS15 compact excavator, the ECT sensor plays a critical role in regulating fuel injection timing, fan clutch engagement, and engine protection shutdown logic. Ignoring this fault can lead to undetected overheating and severe internal engine damage.

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Common Symptoms

When Fault Code 441 is active on the XCMG XS15, operators typically report:

• Warning light illuminated on the instrument cluster (engine or temperature indicator)
• Engine entering a reduced power/derate mode to protect internal components
• Inaccurate or erratic coolant temperature gauge readings — pegged high, low, or fluctuating
• Cooling fan running continuously at full speed as a fail-safe response
• Intermittent engine shutdown or refusal to start in severe cases where the ECM detects a critical fault

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Potential Causes

The following are the most common root causes for this fault code, particularly on used or high-hour XCMG XS15 machines:

• Failed or degraded ECT sensor — thermistor resistance drifts out of spec over time
• Corroded or loose sensor connector — moisture ingress is common in compact excavators working in wet conditions
• Damaged wiring harness — chafing against the engine block or hose routing points, a known wear area on this platform
• Open circuit or short to ground in the sensor signal wire
• ECM connector pin damage — bent, backed-out, or corroded pins at the ECM itself
• Low coolant level causing the sensor tip to read air instead of coolant

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How to Troubleshoot and Fix Code 441

Step 1 — Inspect the Sensor and Connector First Before purchasing any parts, visually inspect the ECT sensor and its harness connector. On used machines, look specifically for green corrosion, cracked connector boots, or melted insulation near exhaust routing. Clean connectors with electrical contact cleaner and reseat the connection.

Step 2 — Check Sensor Resistance Disconnect the ECT sensor and use a digital multimeter to measure resistance across the sensor terminals. At room temperature (~25°C/77°F), a healthy sensor typically reads approximately 2,000–3,000 ohms. Consult your XCMG service manual for the exact resistance-temperature table. A reading of 0Ω (short) or OL (open) confirms sensor failure.

Step 3 — Inspect the Wiring Harness Using your multimeter, perform a continuity check from the sensor connector back to the ECM connector. Look for resistance greater than 1Ω, which indicates harness damage. On used excavators, physically trace the harness and check for chafe points where the wire contacts the engine block or frame.

Step 4 — Verify Supply Voltage With the key ON and sensor disconnected, back-probe the harness connector. You should see a 5V reference signal on the signal wire from the ECM. No voltage indicates an ECM output fault or wiring issue upstream.

Step 5 — Use Diagnostic Software Connect XCMG-compatible diagnostic software (or a compatible J1939 scan tool) to monitor live ECT sensor data. Compare live readings against actual coolant temperature using an infrared thermometer. A significant discrepancy confirms sensor replacement is needed.

Step 6 — Replace and Retest Install a verified OEM-equivalent ECT sensor, clear the fault code, and perform a full warm-up cycle while monitoring data to confirm the repair.

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⚠️ Disclaimer: This guide is intended for informational and diagnostic reference purposes only. Always consult a certified heavy equipment technician and your official XCMG service documentation before performing repairs. Improper diagnosis or repair can result in equipment damage, voided warranties, or personal injury. When in doubt, contact an authorized XCMG service dealer.