P0118 Infiniti Code - Engine Coolant Temperature Sensor Circuit High
Quick Answer
The P0118 Infiniti code indicates a problem with the Engine Coolant Temperature (ECT) Sensor Circuit being too high. Common causes include Faulty ECT Sensor: The ECT sensor itself may be malfunctioning and sending incorrect temperature readings to the ECM, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal between the sensor and the ECM, ECM Malfunction: A malfunctioning ECM can misinterpret the temperature data from the ECT sensor, leading to the high temperature readings. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0118 Infiniti indicates Engine Coolant Temperature Sensor Circuit High.
- Common causes
- Common causes include Faulty ECT Sensor: The ECT sensor itself may be malfunctioning and sending incorrect temperature readings to the ECM, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal between the sensor and the ECM, ECM Malfunction: A malfunctioning ECM can misinterpret the temperature data from the ECT sensor, leading to the high temperature readings.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0118 Infiniti Description
The P0118 Infiniti code indicates a problem with the Engine Coolant Temperature (ECT) Sensor Circuit being too high. The ECT sensor is responsible for measuring the temperature of the engine coolant and sending this information to the engine control module (ECM). This data is crucial for the ECM to adjust fuel delivery and ignition timing to optimize engine performance and fuel efficiency. When the ECT sensor circuit reports a high temperature that is out of the normal operating range, it can lead to various issues with the vehicle's performance.
Common Causes of P0118 Infiniti
- Faulty ECT Sensor: The ECT sensor itself may be malfunctioning and sending incorrect temperature readings to the ECM.
- Wiring or Connector Issues: Damaged or corroded wiring or connectors in the sensor circuit can disrupt the signal between the sensor and the ECM.
- ECM Malfunction: A malfunctioning ECM can misinterpret the temperature data from the ECT sensor, leading to the high temperature readings.
- Cooling System Problems: Issues with the cooling system, such as low coolant levels, a faulty thermostat, or a malfunctioning water pump, can affect the ECT sensor's readings.
Symptoms of P0118 Infiniti
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the instrument panel.
- Engine Overheating: The engine may show signs of overheating, such as the temperature gauge reading higher than normal or steam coming from the engine compartment.
- Poor Fuel Economy: Incorrect temperature readings can lead to improper fuel delivery, resulting in decreased fuel efficiency.
- Rough Idle: The engine may idle roughly or inconsistently due to the ECM trying to compensate for the inaccurate temperature data.
- Engine Misfires: Incorrect temperature readings can cause the engine to misfire or run rough, affecting overall performance.
How to Fix P0118 Infiniti
- Diagnose the Issue: Use a scan tool to retrieve the trouble code and perform a thorough inspection of the ECT sensor, wiring, connectors, and cooling system components.
- Replace the ECT Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
- Repair Wiring or Connectors: Repair or replace any damaged wiring or connectors in the sensor circuit to ensure a secure connection.
- Check and Repair Cooling System: Inspect the cooling system components and address any issues, such as low coolant levels or a faulty thermostat, that may affect the ECT sensor's readings.
- Clear Codes and Test Drive: Clear the trouble code from the ECM's memory, reset the system, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0118 Infiniti
The typical repair costs for addressing the P0118 Infiniti code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor in your area. This estimate includes the cost of a new ECT sensor, wiring repairs, and diagnostic fees. It's important to note that the actual repair costs can vary based on the vehicle make and model, the severity of the issue, and the rates charged by auto repair shops. It's advisable to consult with a professional technician to get an accurate estimate for your specific situation.
When is the Code Detected?
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Information for Specific Infiniti Models
- P0118 2003 Infiniti G35 — Engine Coolant Temperature Circuit High Input
- P0118 2004 Infiniti G35 — Engine Coolant Temperature Circuit High Input
- P0118 2005 Infiniti G35 — Engine Coolant Temperature Circuit High Input
- P0118 2006 Infiniti G35 — Engine Coolant Temperature Circuit High Input
Frequently Asked Questions about P0118 Infiniti Code
1. What does the OBDII code P0118 mean for my Infiniti?
P0118 indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit, specifically that the voltage signal is higher than expected.
2. What are common symptoms of code P0118 in an Infiniti?
Symptoms may include poor fuel economy, rough idle, engine overheating, difficulty starting, and the Check Engine Light being illuminated.
3. What causes the P0118 code to trigger in an Infiniti?
Common causes include a faulty ECT sensor, damaged wiring or connectors, a short circuit, or issues with the engine control module (ECM).
4. Can I drive my Infiniti with a P0118 code?
Driving with a P0118 code is not recommended, as it may lead to poor engine performance, overheating, and potential engine damage.
5. How do I diagnose the P0118 code on my Infiniti?
Diagnosis involves checking the ECT sensor, inspecting the wiring and connectors for damage, and using a multimeter to measure resistance and voltage in the circuit.
6. How do I fix the P0118 code on my Infiniti?
Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring, cleaning corroded connections, or addressing issues with the ECM.
7. Where is the engine coolant temperature sensor located on my Infiniti?
The ECT sensor is typically located near the thermostat housing on the engine block or cylinder head.
8. How much does it cost to fix a P0118 code on an Infiniti?
Repair costs can range from $50 to $300, depending on whether the issue is a simple sensor replacement or more extensive electrical repairs.
9. Can a bad thermostat cause a P0118 code on an Infiniti?
While uncommon, a stuck thermostat causing extreme temperature fluctuations could potentially contribute to this code.
10. Will clearing the code fix the P0118 issue on my Infiniti?
Clearing the code without addressing the underlying problem will not fix it. The code will likely return until the issue is resolved.
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