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P0118 Ford Code - Engine Coolant Temperature Sensor 1 Circuit High

Quick Answer

The P0118 Ford code indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically that the sensor is reading a high voltage signal. Common causes include Faulty ECT sensor, Wiring or connection issues in the ECT sensor circuit, Corrosion or damage to the ECT sensor connector. 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 Ford indicates Engine Coolant Temperature Sensor 1 Circuit High.
Common causes
Common causes include Faulty ECT sensor, Wiring or connection issues in the ECT sensor circuit, Corrosion or damage to the ECT sensor connector.
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 Aug 30, 2024
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Code P0118 Ford Description

The P0118 Ford code indicates a problem with the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically that the sensor is reading a high voltage signal. The ECT sensor is responsible for measuring the temperature of the engine coolant and sending this information to the engine control module (ECM) to ensure optimal engine performance. When the sensor detects a high voltage signal, it can lead to inaccurate temperature readings and potential issues with engine performance, fuel efficiency, and emissions control.

OBDII Code P0118 Ford - Engine Coolant Temperature Sensor 1 Circuit High
P0118 Ford Code - Engine Coolant Temperature Sensor 1 Circuit High

Common Causes of P0118 Ford

  1. Faulty ECT sensor.
  2. Wiring or connection issues in the ECT sensor circuit.
  3. Corrosion or damage to the ECT sensor connector.
  4. Engine coolant level or quality issues.
  5. ECM malfunction.

Symptoms of P0118 Ford

  1. Check engine light illuminated on the dashboard.
  2. Engine running hotter than normal.
  3. Inaccurate temperature gauge readings.
  4. Rough idling or stalling.
  5. Decreased fuel efficiency.

How to Fix P0118 Ford

  1. Begin by diagnosing the issue using a scan tool to confirm the P0118 code and check the ECT sensor's voltage reading.
  2. Inspect the ECT sensor, wiring, and connector for any damage or corrosion. Replace any damaged components.
  3. Test the ECT sensor's resistance and compare it to manufacturer specifications. Replace the sensor if it is out of range.
  4. Clear the trouble codes and perform a test drive to ensure the issue is resolved.
  5. If the problem persists, further diagnostics may be necessary to check for other underlying issues.

Cost to Fix P0118 Ford

The typical repair costs for addressing a P0118 Ford code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0118 Ford

Start by checking for coolant leaks, and if there are no leaks, the thermostat might be stuck closed and need replacement. If the problem persists, change the Engine Coolant Temperature (ECT) sensor.

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Information for Specific Ford Models

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 Ford Code

1. What does the OBDII code P0118 mean on a Ford?

P0118 indicates a high voltage issue in the Engine Coolant Temperature (ECT) Sensor 1 circuit, signaling that the sensor is reading a temperature that is too low or outside the expected range.

2. What are the common symptoms of code P0118 on a Ford?

Symptoms include poor fuel economy, rough idle, difficulty starting, engine running rich, and the cooling fan running continuously.

3. What causes the P0118 code to appear on a Ford?

Common causes include a faulty ECT sensor, damaged wiring or connectors, a short circuit, or a malfunctioning Engine Control Module (ECM).

4. Can I drive my Ford with a P0118 code active?

While the car may still be drivable, it can lead to poor performance, increased emissions, and potential engine damage if not addressed promptly.

5. How is the P0118 code diagnosed on a Ford?

Diagnosis typically involves scanning for additional codes, inspecting the ECT sensor and wiring, testing the sensor's resistance, and verifying the voltage output using a multimeter.

6. How do I fix the P0118 code on my Ford?

Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring, cleaning connectors, or updating/replacing the ECM if needed.

7. Where is the Engine Coolant Temperature Sensor located on a Ford?

The ECT sensor is usually located near the thermostat housing or on the cylinder head, depending on the specific Ford model.

8. How much does it cost to repair a P0118 code on a Ford?

Replacing the ECT sensor typically costs between $50 and $150, including parts and labor. Wiring repairs or ECM replacement may increase costs.

9. Can a bad thermostat cause the P0118 code on a Ford?

While uncommon, a stuck thermostat can indirectly contribute to cooling system issues, but the code is usually caused by sensor or wiring problems.

10. Will clearing the P0118 code fix the problem on my Ford?

Clearing the code will temporarily turn off the check engine light, but the issue will return unless the underlying problem is resolved.

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