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P0117 Ford Code - Engine Coolant Temperature Sensor 1 Circuit Low

Quick Answer

The P0117 Ford code indicates that there is a malfunction in the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically that the sensor is reading a temperature that is lower than expected. Common causes include Faulty ECT sensor, Wiring or connection issues in the ECT sensor circuit, Coolant level is too low or contaminated. 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
P0117 Ford indicates Engine Coolant Temperature Sensor 1 Circuit Low.
Common causes
Common causes include Faulty ECT sensor, Wiring or connection issues in the ECT sensor circuit, Coolant level is too low or contaminated.
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 P0117 Ford Description

The P0117 Ford code indicates that there is a malfunction in the Engine Coolant Temperature (ECT) Sensor 1 Circuit, specifically that the sensor is reading a temperature that is lower than expected. The ECT sensor plays a crucial role in monitoring the temperature of the engine coolant, which is essential for the engine's performance and efficiency. This information is used by the engine control module (ECM) to adjust fuel delivery, ignition timing, and other parameters to ensure optimal operation. When the ECT sensor provides inaccurate readings, it can lead to a variety of issues that can affect the vehicle's performance and fuel efficiency.

OBDII Code P0117 Ford - Engine Coolant Temperature Sensor 1 Circuit Low
P0117 Ford Code - Engine Coolant Temperature Sensor 1 Circuit Low

Common Causes of P0117 Ford

  1. Faulty ECT sensor.
  2. Wiring or connection issues in the ECT sensor circuit.
  3. Coolant level is too low or contaminated.
  4. Engine thermostat malfunction.
  5. Problems with the ECM.

Symptoms of P0117 Ford

  1. Check engine light is illuminated on the dashboard.
  2. Engine running hotter or colder than normal.
  3. Poor fuel economy.
  4. Engine stalling or rough idling.
  5. Difficulty starting the engine, especially in cold weather.

How to Fix P0117 Ford

  1. Begin by diagnosing the issue using a scan tool to verify the P0117 code and check the ECT sensor readings.
  2. Inspect the ECT sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Test the thermostat to ensure it is functioning correctly and replace it if needed.
  4. Check the coolant level and quality, topping up or replacing coolant as required.
  5. Clear the diagnostic trouble codes and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P0117 Ford

The cost of repairing a P0117 Ford code can vary depending on the specific cause of the issue. On average, replacing the ECT sensor can cost between $50 to $150, while replacing the thermostat may cost around $100 to $200. Labor costs can range from $80 to $150 per hour, with the total repair bill likely falling between $150 to $400. It is advisable to consult with a trusted mechanic to get a more accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0117 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 P0117 Ford Code

1. What does the OBDII code P0117 mean on a Ford vehicle?

P0117 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the Engine Coolant Temperature (ECT) sensor.

2. What are the common symptoms of the P0117 code in a Ford?

Symptoms may include poor fuel economy, rough idling, difficulty starting, the engine running hot or cold, and the Check Engine Light turning on.

3. What causes the P0117 code to be triggered?

Common causes include a faulty ECT sensor, damaged or corroded wiring, a short circuit, or a low level of engine coolant.

4. Can I drive my Ford with the P0117 code active?

Driving with this code is not recommended, as it may cause engine overheating or poor performance, which could lead to further damage.

5. How do I diagnose the P0117 code on my Ford?

Inspect the ECT sensor for damage, check wiring and connections for corrosion or shorts, and ensure proper coolant levels. Use a multimeter to test the sensor's resistance.

6. How do I fix the P0117 code in my Ford?

Repairs could involve replacing the ECT sensor, repairing or replacing damaged wiring, cleaning corroded connections, or topping off low coolant.

7. Where is the Engine Coolant Temperature (ECT) sensor located in a Ford vehicle?

The ECT sensor is typically located near the thermostat housing on the engine block or cylinder head.

8. Can a faulty thermostat cause the P0117 code?

Yes, a stuck-open or stuck-closed thermostat can affect coolant temperature readings and may contribute to this code.

9. How much does it cost to fix a P0117 code on a Ford?

Repair costs vary but typically range from $50 to $150 for an ECT sensor replacement, plus labor if done by a professional.

10. Will clearing the P0117 code solve the problem?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.

Discuss the causes and fixes for P0117 Ford OBDII Code

Submit a New Comment

  • I'm showing that code and I am still trying to diagnose it. Theres no water in radiator but theres coolant. Its overheating and its fluctuating. Between hot and normal. I replaced thermostat, seemed to fix it then a week later it starts overheating again. After reading all I could it comes back to a water pump cause theres no milky oil. If it's not head gasket I'm thinking its the pump?

    Reply to Comment

  • Let me check if I can find more information, what model and year is your vehicle?

    Reply to Comment