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P0117 2002 Ford F150 Code - Engine Coolant Temperature Sensor Circuit Low

Quick Answer

The P0117 diagnostic trouble code (DTC) for a 2002 Ford F150 indicates a problem with the engine coolant temperature sensor circuit being lower than the normal operating range. Common causes include Faulty engine coolant temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor circuit. 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 2002 Ford F150 indicates Engine Coolant Temperature Sensor Circuit Low.
Common causes
Common causes include Faulty engine coolant temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor circuit.
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 14, 2024
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Code P0117 2002 Ford F150 Description

The P0117 diagnostic trouble code (DTC) for a 2002 Ford F150 indicates a problem with the engine coolant temperature sensor circuit being lower than the normal operating range. The engine coolant temperature sensor is a crucial component that monitors the temperature of the engine coolant and sends this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery, ignition timing, and other engine functions to ensure optimal performance and efficiency. When the sensor circuit reads lower than expected, it can lead to various issues with the vehicle's operation.

OBDII Code P0117 2002 Ford F150 - Engine Coolant Temperature Sensor Circuit Low
P0117 2002 Ford F150 Code - Engine Coolant Temperature Sensor Circuit Low

Common Causes of P0117 2002 Ford F150

  1. Faulty engine coolant temperature sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or contamination in the sensor circuit
  4. Malfunctioning ECM
  5. Coolant leak affecting sensor readings

Symptoms of P0117 2002 Ford F150

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Difficulty starting the engine
  4. Engine running rich
  5. Delayed engine warm-up

How to Fix P0117 2002 Ford F150

  1. Begin by diagnosing the issue using a scan tool to confirm the P0117 code and check the engine coolant temperature sensor's readings.
  2. Inspect the wiring and connectors in the sensor circuit for any damage or corrosion, repairing or replacing as necessary.
  3. Test the engine coolant temperature sensor for proper operation and replace if found to be faulty.
  4. Clear the DTC and reset the ECM to see if the code returns after repairs.
  5. Perform a test drive to ensure the issue has been resolved and monitor the engine coolant temperature sensor's readings for accuracy.

Cost to Fix P0117 2002 Ford F150

The typical repair costs for addressing a P0117 code on a 2002 Ford F150 can range from $100 to $300, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for similar services.

What does this mean?

Tech Notes for P0117 2002 Ford F150

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

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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 2002 Ford F150 Code

1. What are the common symptoms of OBDII code P0117 in a 2002 Ford F150?

The common symptoms include poor fuel economy, rough idling, engine overheating, and a decrease in overall engine performance.

2. What can cause the Engine Coolant Temperature Sensor Circuit Low code in a 2002 Ford F150?

The code P0117 can be triggered by a faulty engine coolant temperature sensor, damaged wiring or connectors, low coolant levels, or a malfunctioning engine control module (ECM).

3. How can I diagnose the cause of the low engine coolant temperature sensor circuit in my 2002 Ford F150?

You can diagnose the issue by checking the coolant level, inspecting the sensor and its wiring for any visible damage, and using a multimeter to test the sensor's resistance and voltage.

4. Is it safe to continue driving my 2002 Ford F150 with the P0117 code?

It is not recommended to drive your vehicle with the P0117 code, as it can lead to potential engine damage and poor performance. It's best to address the issue promptly.

5. Can I repair the Engine Coolant Temperature Sensor Circuit Low code in my 2002 Ford F150 by myself?

If you have some experience with automotive repairs and the necessary tools, you may be able to replace the coolant temperature sensor or repair the wiring yourself. However, seeking professional help is recommended for accurate diagnosis and repair.

6. Will resetting the OBDII code P0117 in my 2002 Ford F150 make it go away permanently?

Resetting the code may temporarily make the check engine light go off, but if the underlying issue causing the code is not fixed, the code is likely to reappear.

7. How much does it typically cost to repair the Engine Coolant Temperature Sensor Circuit Low code in a 2002 Ford F150?

The cost of repair can vary depending on the exact cause of the issue. Replacing the coolant temperature sensor can cost between $50 to $200, while addressing wiring or ECM issues may be more expensive.

8. Can a faulty engine coolant temperature sensor affect other systems in my 2002 Ford F150?

Yes, a faulty coolant temperature sensor can affect the fuel mixture, ignition timing, and other engine functions, leading to poor performance and potential damage if left unresolved.

9. How long does it take to repair the P0117 code in a 2002 Ford F150?

The repair time can vary based on the exact cause of the issue and your level of experience. Replacing the coolant temperature sensor typically takes around 30 minutes to an hour.

10. Are there any preventative maintenance steps I can take to avoid the Engine Coolant Temperature Sensor Circuit Low code in my 2002 Ford F150?

Regularly checking and maintaining your vehicle's cooling system, including coolant levels and the condition of the temperature sensor, can help prevent issues that trigger the P0117 code.

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