AutoCodes – Toyota – P0118 2005 Toyota Prius

P0118 2005 Toyota Prius 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 2005 Toyota Prius 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 8,612

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0118 2005 Toyota Prius 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 2005 Toyota Prius - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2005 Toyota Prius Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2005 Toyota Prius?

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 2005 Toyota Prius?

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 does this mean?

Code Tech Notes

If there are no coolant leaks, replace the thermostat first, if problem is still there check/replace coolant temperature sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0118 2005 Toyota Prius 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 2005 Toyota Prius 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 2005 Toyota Prius Code

1. What does OBDII code P0118 mean on a 2005 Toyota Prius?

The code P0118 indicates a high input signal from the engine coolant temperature (ECT) sensor circuit in a 2005 Toyota Prius.

2. What are the common symptoms of OBDII code P0118 in a 2005 Toyota Prius?

Common symptoms of code P0118 include the engine running hotter than normal, poor fuel economy, overheating, and possibly a check engine light illuminated on the dashboard.

3. What are the possible causes of OBDII code P0118 in a 2005 Toyota Prius?

Potential causes of code P0118 in a 2005 Toyota Prius include a faulty ECT sensor, a damaged ECT sensor connector or wiring, low coolant level, a malfunctioning thermostat, or issues with the engine's cooling system.

4. How can I diagnose OBDII code P0118 in my 2005 Toyota Prius?

To diagnose code P0118, you can start by checking the coolant level, inspecting the ECT sensor and its wiring, testing the thermostat, and verifying the cooling system's overall condition. A professional diagnostic tool may also be needed for accurate troubleshooting.

5. How can I repair OBDII code P0118 in a 2005 Toyota Prius?

Repairing code P0118 in a 2005 Toyota Prius may involve replacing the engine coolant temperature sensor, repairing or replacing damaged wiring or connectors, addressing cooling system issues, or fixing any underlying problems causing the high input signal.

6. Can I drive my 2005 Toyota Prius with OBDII code P0118?

It is not recommended to drive a 2005 Toyota Prius with code P0118, as it can lead to engine overheating, potential damage, and decreased performance. It is advisable to address the issue promptly to avoid further complications.

7. How much does it cost to fix OBDII code P0118 in a 2005 Toyota Prius?

The cost of fixing code P0118 in a 2005 Toyota Prius can vary depending on the root cause of the issue, labor costs, and parts needed. It is best to consult a mechanic for a proper diagnosis and cost estimate.

8. Will resetting the check engine light resolve OBDII code P0118 in a 2005 Toyota Prius?

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing code P0118. It is essential to diagnose and repair the problem to prevent it from recurring.

9. How long does it take to repair OBDII code P0118 in a 2005 Toyota Prius?

The repair time for code P0118 in a 2005 Toyota Prius can vary based on the cause of the issue and the complexity of the repair needed. Simple fixes like replacing the ECT sensor may take less time compared to diagnosing and fixing wiring problems or cooling system issues.

10. Can a DIY enthusiast fix OBDII code P0118 in a 2005 Toyota Prius?

While some DIY enthusiasts may be able to address code P0118 by replacing the ECT sensor or checking basic wiring, diagnosing and repairing more complex issues related to the cooling system or wiring may require professional expertise. It is essential to have the necessary tools and knowledge before attempting a repair.