AutoCodes – Toyota – P0118 2001 Toyota Highlander

P0118 2001 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 2001 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 4,195

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 2001 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 2001 Toyota Highlander - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2001 Toyota Highlander Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2001 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 2001 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 2001 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 2001 Toyota Highlander code?

Need more information on how to fix the P0118 2001 Toyota Highlander code? Get Access to Factory Service Manuals

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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 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0118 in a 2001 Toyota Highlander?

The common symptoms of code P0118 include the engine running hotter than normal, the temperature gauge showing high readings, and the Check Engine light illuminating on the dashboard.

2. What does the OBDII code P0118 "Engine Coolant Temperature Circuit High Input" mean for a 2001 Toyota Highlander?

Code P0118 indicates that the Engine Control Module (ECM) has detected a high voltage input signal from the Engine Coolant Temperature (ECT) sensor.

3. What are some possible causes of OBDII code P0118 in a 2001 Toyota Highlander?

Common causes of code P0118 include a faulty ECT sensor, a short or open circuit in the ECT sensor wiring, a malfunctioning thermostat, or issues with the ECM itself.

4. How can I diagnose the cause of OBDII code P0118 in my 2001 Toyota Highlander?

To diagnose code P0118, you can start by checking the ECT sensor's wiring and connector for damage or corrosion, testing the sensor's resistance, and verifying the thermostat's operation.

5. Can I drive my 2001 Toyota Highlander with OBDII code P0118 "Engine Coolant Temperature Circuit High Input"?

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

6. How can I repair OBDII code P0118 in a 2001 Toyota Highlander?

Repairing code P0118 may involve replacing the faulty ECT sensor, repairing any damaged wiring, ensuring the thermostat is functioning correctly, and resetting the ECM to clear the code.

7. Will resetting the Check Engine light clear OBDII code P0118 in a 2001 Toyota Highlander?

Resetting the Check Engine light may temporarily clear the code, but if the underlying issue causing P0118 is not addressed, the code is likely to return after some driving cycles.

8. How important is it to fix OBDII code P0118 in a 2001 Toyota Highlander?

It is crucial to address code P0118 promptly to prevent potential engine damage due to overheating. Ignoring this code can lead to costly repairs down the line.

9. Can a DIY enthusiast repair OBDII code P0118 in a 2001 Toyota Highlander?

Depending on your skill level and access to tools, a DIY enthusiast may be able to repair code P0118 by following a repair manual specific to the Highlander and using proper diagnostic equipment.

10. How much does it typically cost to fix OBDII code P0118 in a 2001 Toyota Highlander?

The cost of repairing code P0118 can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or take your vehicle to a professional mechanic.