AutoCodes – Honda – P0118 2009 Honda Accord

P0118 2009 Honda Accord Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

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 2009 Honda Accord indicates Engine Coolant Temperature Sensor 1 Circuit High Voltage.
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 7,799

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 2009 Honda Accord 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 2009 Honda Accord - Engine Coolant Temperature Sensor 1 Circuit High Voltage - AutoCodes.com — P0118 2009 Honda Accord Code - Engine Coolant Temperature Sensor 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0118 2009 Honda Accord?

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 2009 Honda Accord?

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 2009 Honda Accord 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 2009 Honda Accord 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 2009 Honda Accord Code

1. What are the common symptoms of OBDII code P0118 on a 2009 Honda Accord?

- Common symptoms include the engine running hot, inaccurate temperature gauge readings, poor fuel economy, and potential issues with the vehicle's heater.

2. What does the OBDII code P0118 indicate on a 2009 Honda Accord?

- This code indicates a high voltage condition in the Engine Coolant Temperature Sensor 1 circuit, suggesting a potential problem with the sensor or its circuit.

3. What are the possible causes of OBDII code P0118 on a 2009 Honda Accord?

- The code can be triggered by a faulty engine coolant temperature sensor, a damaged sensor connector, a malfunctioning thermostat, low coolant levels, or issues with the sensor circuit wiring.

4. How can I diagnose the issue causing OBDII code P0118 on my 2009 Honda Accord?

- To diagnose the problem, you can use a multimeter to test the engine coolant temperature sensor's resistance, check the sensor's wiring for breaks or damage, and inspect the coolant level and thermostat.

5. Can driving with OBDII code P0118 on a 2009 Honda Accord cause further damage?

- Continuing to drive with this code may lead to overheating issues, potential damage to the engine, and reduced fuel efficiency. It is advisable to address the problem promptly.

6. How can I repair OBDII code P0118 on my 2009 Honda Accord?

- Repair options include replacing the engine coolant temperature sensor, fixing any damaged wiring or connectors, ensuring proper coolant levels, and replacing the thermostat if necessary.

7. Is it possible to reset OBDII code P0118 on a 2009 Honda Accord without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it is not recommended as the issue causing the code will persist, potentially leading to more serious problems down the line.

8. Can a DIY enthusiast fix OBDII code P0118 on a 2009 Honda Accord?

- Yes, replacing the engine coolant temperature sensor and checking the wiring connections are tasks that can be performed by a DIY enthusiast with basic automotive repair skills and tools.

9. How much does it typically cost to repair OBDII code P0118 on a 2009 Honda Accord at a mechanic?

- The cost of repairing this code can vary depending on the root cause, but it may range from $100 to $300 at a mechanic, including parts and labor.

10. How often does OBDII code P0118 occur in a 2009 Honda Accord, and is it a common issue?

- While it's not the most common issue, OBDII code P0118 can occur in a 2009 Honda Accord due to sensor failures, wiring problems, or cooling system issues. Regular maintenance can help prevent this code from appearing.