What is Liebherr Excavator Fault Code E160?

Liebherr Fault Code E160 indicates a malfunction in the engine coolant temperature sensor circuit or an implausible coolant temperature reading detected by the Electronic Control Module (ECM). This code specifically relates to the temperature monitoring system that protects the engine from overheating damage.

The coolant temperature sensor is a critical component in Liebherr excavators that monitors engine operating temperature and sends voltage signals to the ECM. When the ECM detects voltage readings outside the expected range (typically 0.5-4.5 volts) or receives signals that don't correlate with actual engine conditions, it triggers Code E160. This is particularly critical because the ECM uses coolant temperature data to adjust fuel injection timing, control engine fan speed, and prevent catastrophic engine damage from overheating. On used Liebherr excavators, this sensor and its wiring harness are prone to deterioration from years of heat cycling and environmental exposure.

Common Symptoms

When Code E160 is active, operators typically experience:

• Engine warning light or malfunction indicator illuminated on the instrument cluster
• Cooling fan running continuously at maximum speed, even when engine is cold
• Hard starting conditions or rough idle, especially during cold starts
• Reduced engine power or derate mode activation as a protective measure
• Inaccurate temperature gauge readings showing extreme high or low temperatures that don't match actual engine condition

Potential Causes

The most common technical reasons for E160 on used Liebherr excavators include:

• Faulty coolant temperature sensor with internal resistance drift or complete failure (most common on machines with 5,000+ hours)
• Damaged wiring harness or corroded connectors between the sensor and ECM, particularly at harness routing points near the engine block
• Contaminated sensor connector with coolant intrusion, oil residue, or corrosion on terminal pins
• Poor electrical ground connection at the sensor mounting location due to rust or gasket degradation
• ECM software calibration issues or internal ECM fault (rare, but possible on older machines)
• Coolant contamination causing sensor element coating and inaccurate readings

How to Troubleshoot and Fix Code E160

Step 1: Visual Inspection Begin by locating the coolant temperature sensor (typically mounted on the engine block or thermostat housing). Inspect the sensor connector for corrosion, coolant leaks, bent pins, or oil contamination. Check the wiring harness from sensor to ECM for chafing, particularly where it contacts the engine block or passes through metal brackets—common wear points on used equipment.

Step 2: Electrical Testing Disconnect the sensor connector and use a digital multimeter to measure sensor resistance. On a cold engine (approximately 68°F/20°C), resistance should typically read 2,000-3,000 ohms; consult your specific Liebherr service manual for exact specifications. Test the harness by measuring voltage supply from the ECM (should be approximately 5 volts) and verify ground circuit continuity (less than 1 ohm resistance).

Step 3: Component Replacement and Verification If sensor resistance is out of specification or harness shows continuity issues, replace the faulty component. For used excavators, always replace the sensor O-ring or gasket and apply dielectric grease to connector terminals to prevent future corrosion. After replacement, clear the fault code using Liebherr diagnostic software (LiDat) and perform a cold-to-warm engine cycle to verify proper sensor operation and confirm the code doesn't return.

Disclaimer: This guide provides general troubleshooting information. Always consult your Liebherr service manual and consider professional diagnostic assistance for complex electrical issues or if you're unsure about any procedure.