Engine-Codes.com
Engine-Codes – Mitsubishi – P0118 Mitsubishi

P0118 Mitsubishi Code - Engine Coolant Temperature Sensor High Input

Quick Answer

The P0118 code for Mitsubishi vehicles indicates that the Engine Coolant Temperature (ECT) sensor is sending a high input signal to the Engine Control Module (ECM). Common causes include Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning ECT sensor that is sending incorrect high input signals to the ECM, Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal and trigger the code, Corroded Connector: Corrosion on the ECT sensor connector can cause poor electrical contact, leading to high input signal 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 Mitsubishi indicates Engine Coolant Temperature Sensor High Input.
Common causes
Common causes include Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning ECT sensor that is sending incorrect high input signals to the ECM, Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal and trigger the code, Corroded Connector: Corrosion on the ECT sensor connector can cause poor electrical contact, leading to high input signal 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0118 Mitsubishi Description

The P0118 code for Mitsubishi vehicles indicates that the Engine Coolant Temperature (ECT) sensor is sending a high input signal to the Engine Control Module (ECM). The ECT sensor is a crucial component that monitors the temperature of the engine coolant. This information is essential for the ECM to adjust fuel delivery and ignition timing to ensure optimal engine performance and efficiency. When the ECT sensor reports a high input signal, it means that the engine coolant temperature is higher than expected, which can lead to various issues.

OBDII Code P0118 Mitsubishi - Engine Coolant Temperature Sensor High Input
P0118 Mitsubishi Code - Engine Coolant Temperature Sensor High Input

Common Causes of P0118 Mitsubishi

  1. Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning ECT sensor that is sending incorrect high input signals to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connecting the ECT sensor to the ECM can disrupt the signal and trigger the code.
  3. Corroded Connector: Corrosion on the ECT sensor connector can cause poor electrical contact, leading to high input signal readings.
  4. ECM Malfunction: In rare cases, a malfunctioning ECM can misinterpret the signals from the ECT sensor, triggering the code.

Symptoms of P0118 Mitsubishi

  1. Check Engine Light: The most common symptom associated with the P0118 code is the illumination of the Check Engine Light on the dashboard.
  2. Engine Overheating: A high input signal from the ECT sensor may cause the engine to overheat due to incorrect temperature readings.
  3. Poor Fuel Efficiency: Incorrect temperature data can lead to improper fuel mixture, resulting in reduced fuel efficiency.
  4. Rough Idle: The engine may experience rough idling or stalling due to incorrect adjustments made by the ECM based on faulty temperature readings.

How to Fix P0118 Mitsubishi

  1. Diagnose the Issue: Use a scan tool to retrieve the P0118 code and perform a visual inspection of the ECT sensor, wiring, and connector.
  2. Test the ECT Sensor: Check the ECT sensor's resistance with a multimeter to determine if it is functioning correctly.
  3. Replace the ECT Sensor: If the sensor is faulty, replace it with a new one and ensure proper installation.
  4. Check Wiring and Connector: Inspect the wiring for damage or corrosion, repair or replace as needed. Clean the connector to ensure a secure connection.
  5. Clear the Code: After completing the repair, clear the code from the ECM memory using a scan tool to reset the Check Engine Light.

Cost to Fix P0118 Mitsubishi

The typical repair costs for addressing the P0118 code in a Mitsubishi vehicle can range from $100 to $300, including parts and labor. The cost of the ECT sensor itself is relatively affordable, usually ranging from $20 to $50. However, labor costs can vary depending on the shop's hourly rates and the complexity of the repair. It is advisable to check with local auto repair shops for more accurate pricing based on your specific vehicle make and model. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the issue, which can affect the overall repair cost.

When is the Code Detected?

An excessively high voltage from the sensor is sent to ECM.

Need more information about the P0118 Mitsubishi code?

Need more information on how to fix the P0118 Mitsubishi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0118 Mitsubishi code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0118 Mitsubishi Code

What does OBDII code P0118 mean for a Mitsubishi vehicle?

P0118 indicates a high input signal from the engine coolant temperature (ECT) sensor, suggesting the sensor may be malfunctioning or experiencing an electrical issue.

What are the common symptoms of code P0118 in a Mitsubishi?

Symptoms include poor fuel economy, difficulty starting the engine, rough idling, engine overheating, and the check engine light being illuminated.

What causes the P0118 code in a Mitsubishi?

Common causes include a faulty ECT sensor, damaged wiring or connectors, a short circuit, or issues with the engine control module (ECM).

Can driving with the P0118 code damage my Mitsubishi engine?

Yes, prolonged driving with this code can lead to poor engine performance, overheating, and potential damage to internal components.

How do I diagnose the P0118 code on a Mitsubishi?

Start by inspecting the ECT sensor and its wiring for damage, then use a multimeter to check for proper voltage readings. If needed, perform further tests on the ECM.

How do you fix code P0118 in a Mitsubishi?

Repairs may involve replacing the ECT sensor, repairing or replacing damaged wiring, cleaning sensor connectors, or addressing ECM issues.

Is replacing the ECT sensor the only solution for code P0118?

No, while replacing the ECT sensor is common, the issue could also stem from wiring problems or ECM faults, which may require other repairs.

What does the ECT sensor do in a Mitsubishi?

The ECT sensor measures the engine’s coolant temperature and sends signals to the ECM to adjust fuel delivery, ignition timing, and other engine parameters.

How much does it cost to fix code P0118 in a Mitsubishi?

The cost varies but typically ranges from $100 to $300 for parts and labor, depending on whether the ECT sensor, wiring, or ECM requires repair.

Can a faulty thermostat cause code P0118 in a Mitsubishi?

While unlikely, a stuck thermostat could indirectly affect coolant temperature readings and contribute to engine overheating, which might trigger related codes.

Discuss the causes and fixes for P0118 Mitsubishi OBDII Code

Submit a New Comment