AutoCodes – Toyota – P0118 2006 Toyota Highlander

P0118 2006 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 2006 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 4,983

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 2006 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 2006 Toyota Highlander - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2006 Toyota Highlander Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2006 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 2006 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 2006 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 2006 Toyota Highlander code?

Need more information on how to fix the P0118 2006 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 2006 Toyota Highlander Code

1. What does the OBDII code P0118 for a 2006 Toyota Highlander mean?

The code P0118 indicates that there is a high input signal detected in the engine coolant temperature circuit.

2. What are the common symptoms of the P0118 code in a 2006 Toyota Highlander?

Common symptoms of the P0118 code include the engine overheating, inaccurate temperature gauge readings, and a check engine light illuminated on the dashboard.

3. What are the possible causes of the P0118 code in a 2006 Toyota Highlander?

Possible causes of the P0118 code include a faulty coolant temperature sensor, a damaged wiring harness, a malfunctioning thermostat, or low coolant levels.

4. How can I diagnose the P0118 code in my 2006 Toyota Highlander?

Diagnosing the P0118 code involves checking the coolant temperature sensor, inspecting the wiring for any damage, verifying coolant levels, and testing the thermostat for proper functioning.

5. Can I drive my 2006 Toyota Highlander with the P0118 code?

It is not recommended to drive your vehicle with the P0118 code, 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 2006 Toyota Highlander?

Repairing the P0118 code may involve replacing the coolant temperature sensor, repairing any damaged wiring, ensuring proper coolant levels, and addressing any thermostat issues.

7. Will resetting the check engine light fix the P0118 code in my 2006 Toyota Highlander?

Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the P0118 code. Proper diagnosis and repair are necessary.

8. Can a DIY enthusiast fix the P0118 code in a 2006 Toyota Highlander?

Depending on your mechanical skills and access to tools, a DIY enthusiast may be able to address the P0118 code by following repair guides and procedures carefully.

9. How much does it cost to repair the P0118 code in a 2006 Toyota Highlander?

The cost of repairing the P0118 code can vary depending on the specific issue causing it. Costs may include parts such as a new coolant temperature sensor and labor for the repair.

10. How often does the P0118 code occur in a 2006 Toyota Highlander?

The P0118 code can occur sporadically or persistently, depending on the severity of the issue causing it. Regular maintenance and prompt repairs can help prevent this code from reoccurring.