AutoCodes – Toyota – P0117 2007 Toyota Prius

P0117 2007 Toyota Prius Code - Engine Coolant Temperature Circuit Low Input

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat. 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 2007 Toyota Prius indicates Engine Coolant Temperature Circuit Low Input.
Common causes: Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat.
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 Popularity 7,533

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0117 2007 Toyota Prius Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

OBDII Code P0117 2007 Toyota Prius - Engine Coolant Temperature Circuit Low Input - AutoCodes.com — P0117 2007 Toyota Prius Code - Engine Coolant Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0117 2007 Toyota Prius?

Low engine coolant level
Faulty Engine Coolant Temperature (ECT) sensor
Faulty engine coolant thermostat
Engine Coolant Temperature (ECT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

How to Fix the DTC P0117 2007 Toyota Prius?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If there are no coolant leaks, replace the thermostat first, if problem is still there check/replace coolant temperature sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0117 2007 Toyota Prius code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0117 2007 Toyota Prius code?

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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 2007 Toyota Prius Code

1. What are the common symptoms of OBDII code P0117 on a 2007 Toyota Prius?

The common symptoms include inaccurate temperature gauge readings, illuminated check engine light, poor fuel economy, and potential engine performance issues.

2. What causes the Engine Coolant Temperature Circuit Low Input code (P0117) on a 2007 Toyota Prius?

The code P0117 is usually triggered by a faulty engine coolant temperature (ECT) sensor, a damaged ECT sensor connector, or issues with the ECT sensor wiring.

3. How can I diagnose the cause of OBDII code P0117 on my 2007 Toyota Prius?

To diagnose the issue, you can use a scan tool to read the code and monitor the ECT sensor's data. Check for any obvious wiring issues or connector damage, and test the ECT sensor's resistance to determine its functionality.

4. Can a faulty thermostat cause OBDII code P0117 on a 2007 Toyota Prius?

Yes, a malfunctioning thermostat can cause the ECT sensor to provide incorrect readings, which may trigger the P0117 code. It's essential to check the thermostat's operation during diagnosis.

5. What are some repair tips for fixing OBDII code P0117 on a 2007 Toyota Prius?

Start by inspecting the ECT sensor, connector, and wiring for any visible damage. Replace the ECT sensor if faulty and ensure all connections are secure. Additionally, consider testing and, if necessary, replacing the thermostat.

6. Is it safe to continue driving my 2007 Toyota Prius with OBDII code P0117?

While the vehicle may still be operable with the code present, it's recommended to address the issue promptly to prevent potential engine damage, poor performance, or reduced fuel efficiency.

7. Will resetting the check engine light resolve OBDII code P0117 on a 2007 Toyota Prius?

Resetting the check engine light will clear the code temporarily, but if the underlying issue causing code P0117 is not fixed, the light will likely reappear once the problem is detected again.

8. Can extreme weather conditions trigger OBDII code P0117 on a 2007 Toyota Prius?

Yes, extreme cold or hot weather can affect the ECT sensor's readings and may lead to the P0117 code. Ensure the sensor and related components are functioning correctly, especially in harsh weather conditions.

9. How much does it typically cost to repair OBDII code P0117 on a 2007 Toyota Prius?

The cost of repairing code P0117 can vary depending on the root cause of the issue. Replacing the ECT sensor or thermostat may cost between $100 to $300, including parts and labor.

10. Can a DIY enthusiast fix OBDII code P0117 on a 2007 Toyota Prius?

While some may have the skills to diagnose and replace the ECT sensor or thermostat themselves, it's recommended to have a professional mechanic handle the repair to ensure proper diagnosis and installation.