AutoCodes – Toyota – P0118 2007 Toyota Highlander

P0118 2007 Toyota Highlander Code - Engine Coolant Temperature Circuit High 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: P0118 2007 Toyota Highlander indicates Engine Coolant Temperature Circuit High 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 5,102

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0118 2007 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 P0118 2007 Toyota Highlander - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2007 Toyota Highlander Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2007 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 electrical circuit poor connection

How to Fix the DTC P0118 2007 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 P0118 2007 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 P0118 2007 Toyota Highlander code?

Need more information on how to fix the P0118 2007 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 P0118 2007 Toyota Highlander Code

1. What are common symptoms of OBDII code P0118 in a 2007 Toyota Highlander?

The common symptoms include the engine running hotter than normal, temperature gauge reading high, poor fuel economy, and potential issues with the vehicle's heater.

2. What does the OBDII code P0118 indicate in a 2007 Toyota Highlander?

The code P0118 indicates a high input signal from the engine coolant temperature sensor, suggesting a problem with the sensor or its circuit.

3. What are the possible causes of the P0118 code in a 2007 Toyota Highlander?

Possible causes of the P0118 code include a faulty engine coolant temperature sensor, a malfunctioning thermostat, a wiring issue in the coolant temperature sensor circuit, or low coolant levels.

4. How can I diagnose the P0118 code in my 2007 Toyota Highlander?

Diagnosing the P0118 code involves checking the engine coolant level, inspecting the coolant temperature sensor and its wiring for damage, and testing the thermostat for proper function.

5. Can I continue driving my 2007 Toyota Highlander with the P0118 code?

It is not recommended to drive your vehicle with the P0118 code unresolved, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

6. How can I repair the P0118 code in my 2007 Toyota Highlander?

Repairing the P0118 code may involve replacing the engine coolant temperature sensor, fixing any wiring issues, replacing the thermostat if necessary, and clearing the trouble code from the vehicle's computer.

7. Will resetting the trouble code resolve the P0118 issue in my 2007 Toyota Highlander?

Resetting the trouble code may temporarily clear the Check Engine Light, but it will not fix the underlying problem causing the P0118 code. Proper diagnosis and repair are necessary.

8. Are there any DIY tips for addressing the P0118 code in a 2007 Toyota Highlander?

DIY tips for addressing the P0118 code include checking for visible damage to the sensor and its wiring, ensuring the coolant level is correct, and using a multimeter to test the sensor's resistance.

9. Can a faulty engine coolant temperature sensor cause other issues in a 2007 Toyota Highlander?

Yes, a faulty engine coolant temperature sensor can cause other issues such as poor engine performance, incorrect fuel mixture, and potential damage to the engine due to overheating.

10. How important is it to fix the P0118 code promptly in a 2007 Toyota Highlander?

It is crucial to address the P0118 code promptly to prevent potential engine damage, ensure proper engine performance, and maintain the overall reliability of your 2007 Toyota Highlander.