Volvo Excavator Fault Code 187PPID13545: Meaning, Symptoms & Fix

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What is Volvo Excavator Fault Code 187PPID13545?

Fault Code 187PPID13545 on Volvo excavators indicates a failure or abnormal signal condition related to the Engine Coolant Level Sensor circuit, flagged through the SAE J1939/J1587 data link protocol.

The PPID (Proprietary Parameter Identifier) designation means this is a manufacturer-specific parameter monitored by Volvo's ECM (Engine Control Module). Specifically, PID 135 with a Failure Mode Identifier (FMI) of 45 points to an out-of-range or erratic voltage signal from the coolant level sensor circuit.

This fault is critical because the ECM relies on accurate coolant level data to prevent catastrophic engine overheating. On used Volvo excavators — particularly older EC series machines — ignoring this code can result in undetected low coolant conditions leading to severe engine damage.

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Common Symptoms

When fault code 187PPID13545 is active, operators typically experience:

• Warning light or alarm activation on the instrument cluster, often the coolant/temperature indicator
• Engine derate mode — reduced power output as a protective response from the ECM
• Intermittent or constant fault code logging even when coolant levels appear normal
• Machine shutdown or failure to start in severe cases
• Erratic or frozen coolant level readings on the Volvo MATRIS or VCADS Pro diagnostic display

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Potential Causes

The most common technical causes for this fault include:

• Failed or degraded coolant level sensor — common in high-hour used machines
• Corroded or damaged connector pins at the sensor harness plug, especially in machines exposed to harsh environments
• Chafed or broken wiring harness — known rub points near the engine block and firewall on EC210/EC240 series
• Short to ground or open circuit in the sensor signal wire
• ECM software anomaly or internal ECM fault (less common but possible on older units)

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How to Troubleshoot and Fix Code 187PPID13545

Step 1 — Visual Inspection First Begin with a thorough inspection of the coolant level sensor and its harness. On used excavators, check for signs of corrosion, moisture intrusion, or heat damage at the connector. Clean terminals with electrical contact cleaner before drawing conclusions.

Step 2 — Check Wiring Continuity Using a digital multimeter, perform a continuity test on the sensor signal wire from the sensor connector back to the ECM pin. Look for resistance above 5 ohms, which indicates a damaged harness. Check for shorts to ground using the resistance function.

Step 3 — Test Sensor Output Voltage With the ignition key ON, measure reference voltage at the sensor connector. You should read approximately 5V DC on the signal wire. A reading significantly above or below this range confirms sensor failure.

Step 4 — Use VCADS Pro Diagnostic Software Connect Volvo VCADS Pro or PTT (Premium Tech Tool) to read live parameter data. Verify the coolant level sensor PID is reporting within acceptable range and clear the fault to test for recurrence.

Step 5 — Replace if Confirmed If wiring checks pass but the fault persists, replace the coolant level sensor with a genuine Volvo OEM part. Aftermarket sensors may not meet the exact resistance specifications required by the ECM.

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Disclaimer: This guide is intended for informational purposes for qualified diesel mechanics and equipment professionals. Always consult a certified Volvo heavy equipment technician and refer to the official Volvo service manual before performing repairs. Improper diagnosis or repair can result in equipment damage or personal injury.