AutoCodes – Toyota – P0117 2005 Toyota Highlander

P0117 2005 Toyota Highlander 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 2005 Toyota Highlander 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 4,804

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
Cost to Diagnose
FAQs
Comments
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Code P0117 2005 Toyota Highlander 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 2005 Toyota Highlander - Engine Coolant Temperature Circuit Low Input - AutoCodes.com — P0117 2005 Toyota Highlander Code - Engine Coolant Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0117 2005 Toyota Highlander?

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 2005 Toyota Highlander?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0117 2005 Toyota Highlander 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 2005 Toyota Highlander code?

Need more information on how to fix the P0117 2005 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the 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 2005 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0117 in a 2005 Toyota Highlander?

The common symptoms of code P0117 in a 2005 Toyota Highlander include poor fuel economy, rough idling, and the engine running hotter than normal.

2. What does the OBDII code P0117 indicate in a 2005 Toyota Highlander?

Code P0117 in a 2005 Toyota Highlander indicates a low input signal from the engine coolant temperature (ECT) sensor.

3. What are the possible causes of OBDII code P0117 in a 2005 Toyota Highlander?

Possible causes of code P0117 in a 2005 Toyota Highlander include a faulty ECT sensor, damaged wiring or connectors, low coolant level, or a malfunctioning engine control module (ECM).

4. How can I diagnose the OBDII code P0117 in a 2005 Toyota Highlander?

To diagnose code P0117 in a 2005 Toyota Highlander, you can use a scan tool to check for the code, test the ECT sensor using a multimeter, inspect the wiring and connectors for damage, and ensure the coolant level is adequate.

5. Can I still drive my 2005 Toyota Highlander with OBDII code P0117?

It is not recommended to drive your 2005 Toyota Highlander with code P0117, as it can lead to poor engine performance and potential overheating issues. It is best to address the problem promptly.

6. How can I repair OBDII code P0117 in my 2005 Toyota Highlander?

To repair code P0117 in a 2005 Toyota Highlander, you may need to replace the ECT sensor, repair any damaged wiring or connectors, top up the coolant level, or reprogram the ECM if necessary.

7. Will resetting the check engine light fix OBDII code P0117 in a 2005 Toyota Highlander?

Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing code P0117 in a 2005 Toyota Highlander. Proper diagnosis and repair are required.

8. How important is it to fix OBDII code P0117 in a 2005 Toyota Highlander?

It is crucial to fix code P0117 in a 2005 Toyota Highlander promptly to prevent potential engine damage, overheating, and poor fuel efficiency. Ignoring the issue can lead to more severe problems.

9. Can a DIY enthusiast fix OBDII code P0117 in a 2005 Toyota Highlander?

If you have the necessary tools and knowledge, a DIY enthusiast may be able to fix code P0117 in a 2005 Toyota Highlander by following proper diagnostic procedures and making the required repairs.

10. How much does it cost to repair OBDII code P0117 in a 2005 Toyota Highlander?

The cost to repair code P0117 in a 2005 Toyota Highlander can vary depending on the specific cause of the issue. Costs may include the price of a new ECT sensor, wiring repairs, or diagnostic services if performed by a professional mechanic.