P0115 Fault Code

Engine Coolant Temperature Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0115 fault code indicates a malfunction in the Engine Coolant Temperature (ECT) sensor circuit. This sensor is crucial for monitoring the engine's temperature and provides vital data to the engine control unit (ECU) for optimal performance. A fault in this circuit can lead to incorrect readings, which may affect engine efficiency and emissions.

What are the symptoms of the P0115 code?

Common symptoms associated with the P0115 code include:

• Check Engine Light illuminated on the dashboard.
• Inconsistent engine performance and efficiency.
• Overheating or undercooling of the engine.
• Poor fuel economy.
• Difficulty starting the engine or rough idling.

What causes the P0115 code?

Several factors can trigger the P0115 code, including:

• Faulty ECT sensor.
• Wiring issues such as shorts or open circuits.
• Poor connections at the ECT connector.
• Malfunctioning thermostat, which may cause the engine to operate outside its intended temperature range.
• Issues within the ECU itself.

How to fix P0115?

To resolve the P0115 fault code, follow these steps:

1. Inspect the ECT sensor for damage or corrosion.
2. Check the wiring and connectors for any signs of wear, shorts, or disconnections.
3. Test the ECT sensor with a multimeter to ensure it operates within the specified range.
4. Replace the ECT sensor if it is found to be faulty.
5. Clear the fault codes and conduct a test drive to ensure the issue is resolved.