AutoCodes – Toyota – P0118 2002 Toyota Highlander

P0118 2002 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 2002 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 4,729

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 2002 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 2002 Toyota Highlander - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2002 Toyota Highlander Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2002 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 2002 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 2002 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 2002 Toyota Highlander code?

Need more information on how to fix the P0118 2002 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 2002 Toyota Highlander Code

1. What does OBDII code P0118 on a 2002 Toyota Highlander mean?

The code P0118 indicates a high input in the engine coolant temperature circuit.

2. What are common symptoms of OBDII code P0118 on a 2002 Toyota Highlander?

Common symptoms include the temperature gauge reading abnormally high, the check engine light illuminating, and potential issues with engine performance.

3. What are possible causes of OBDII code P0118 on a 2002 Toyota Highlander?

Common causes of this code include a faulty engine coolant temperature sensor, a malfunctioning thermostat, wiring issues, or a problem with the engine control module.

4. How can I diagnose OBDII code P0118 on my 2002 Toyota Highlander?

Diagnosing this code involves checking the engine coolant temperature sensor, inspecting for any wiring faults, and testing the thermostat for proper operation.

5. Can driving with OBDII code P0118 on a 2002 Toyota Highlander cause further damage?

Continued driving with this code may lead to overheating issues, potential damage to the engine, and reduced fuel efficiency. It is recommended to address the issue promptly.

6. How can I repair OBDII code P0118 on my 2002 Toyota Highlander?

Repairing this code typically involves replacing the engine coolant temperature sensor, fixing any wiring problems, and ensuring the thermostat is functioning correctly.

7. Will resetting the OBDII code P0118 on a 2002 Toyota Highlander make it go away permanently?

Resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause.

8. Can a DIY enthusiast fix OBDII code P0118 on a 2002 Toyota Highlander?

Depending on the skill level, DIY enthusiasts can attempt to fix this code by following repair guides and using the necessary tools. However, if unsure, it is recommended to seek professional help.

9. How long does it take to repair OBDII code P0118 on a 2002 Toyota Highlander?

The repair time for this code can vary depending on the exact cause and the expertise of the person performing the repair. It can take anywhere from 30 minutes to a few hours.

10. Is it safe to drive with OBDII code P0118 on a 2002 Toyota Highlander?

It is not recommended to drive with this code for an extended period as it can lead to potential engine issues. It is best to address the problem promptly to ensure the vehicle's safety and performance.