Engine-Codes.com
Engine-Codes – Nissan – P0118 2009 Nissan Sentra

P0118 2009 Nissan Sentra Code - Engine Coolant Temperature Sensor Circuit High

Quick Answer

The P0118 code for a 2009 Nissan Sentra indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit registering a high voltage. Common causes include Faulty ECT sensor: The ECT sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM, Wiring issues: Damaged or corroded wiring in the ECT sensor circuit can cause high voltage readings, Poor electrical connection: Loose or poor electrical connections at the ECT sensor or ECM can lead to high voltage signals. 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 Nissan Sentra indicates Engine Coolant Temperature Sensor Circuit High.
Common causes
Common causes include Faulty ECT sensor: The ECT sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM, Wiring issues: Damaged or corroded wiring in the ECT sensor circuit can cause high voltage readings, Poor electrical connection: Loose or poor electrical connections at the ECT sensor or ECM can lead to high voltage signals.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0118 2009 Nissan Sentra Description

The P0118 code for a 2009 Nissan Sentra indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit registering a high voltage. The ECT sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing to optimize engine performance and fuel efficiency. When the ECT sensor circuit shows a high voltage reading, it means that the engine coolant temperature is higher than expected, which can lead to various issues.

OBDII Code P0118 2009 Nissan Sentra - Engine Coolant Temperature Sensor Circuit High
P0118 2009 Nissan Sentra Code - Engine Coolant Temperature Sensor Circuit High

Common Causes of P0118 2009 Nissan Sentra

  1. Faulty ECT sensor: The ECT sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring in the ECT sensor circuit can cause high voltage readings.
  3. Poor electrical connection: Loose or poor electrical connections at the ECT sensor or ECM can lead to high voltage signals.
  4. Coolant leaks: Low coolant levels or leaks in the cooling system can affect the ECT sensor readings.
  5. ECM malfunction: In rare cases, a faulty ECM can misinterpret ECT sensor data and trigger the P0118 code.

Symptoms of P0118 2009 Nissan Sentra

  1. Engine overheating: The most common symptom of a faulty ECT sensor circuit is engine overheating, as the ECM may not receive accurate temperature readings to adjust cooling system operation.
  2. Poor fuel economy: Incorrect temperature readings can lead to improper fuel delivery, resulting in decreased fuel efficiency.
  3. Rough idling or stalling: The ECM may adjust engine parameters incorrectly based on faulty temperature readings, leading to rough idling or stalling.
  4. Check Engine Light: The illumination of the Check Engine Light on the dashboard is a common indicator of this issue.

How to Fix P0118 2009 Nissan Sentra

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the ECT sensor, wiring, and connections.
  2. Replace the ECT sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  3. Check wiring and connections: Inspect the wiring harness for any damage or corrosion, and ensure all connections are secure.
  4. Clear the trouble code: After making the necessary repairs, clear the trouble code using a diagnostic scanner to reset the Check Engine Light.
  5. Test drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the engine operates within normal temperature ranges.

Cost to Fix P0118 2009 Nissan Sentra

The cost of repairing a P0118 code on a 2009 Nissan Sentra can vary depending on the specific cause of the issue. In general, the cost of replacing the ECT sensor itself can range from $50 to $150, depending on the brand and quality of the sensor. Labor costs for this repair can range from $80 to $150 per hour, and the total repair time may take around 1-2 hours. Therefore, the total cost of repairing a P0118 code on a 2009 Nissan Sentra can be estimated to be between $130 and $450, including parts and labor. It's important to note that these are rough estimates, and actual costs may vary based on the location of the repair shop, the specific diagnosis time, and the rates charged by the technician.

What does this mean?

Tech Notes for P0118 2009 Nissan Sentra

Check for coolant leaks first, if there are no leaks check to see if thermostat is opening and closing properly if its not replace thermostat if problem is still there coolant temperature sensor may need to be replaced.

When is the Code Detected?

An excessively high voltage from the sensor is sent to ECM.

Need more information about the P0118 2009 Nissan Sentra code?

Need more information on how to fix the P0118 2009 Nissan Sentra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0118 2009 Nissan Sentra code diagnosed by a professional: Find a repair shop in your area

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 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0118 on a 2009 Nissan Sentra?

The common symptoms of OBDII code P0118 on a 2009 Nissan Sentra include engine overheating, rough idling, poor fuel economy, and a temperature gauge reading that is higher than normal.

2. What does OBDII code P0118 indicate on a 2009 Nissan Sentra?

OBDII code P0118 on a 2009 Nissan Sentra indicates a high voltage signal from the Engine Coolant Temperature (ECT) sensor circuit.

3. What are the possible causes of OBDII code P0118 on a 2009 Nissan Sentra?

Possible causes of OBDII code P0118 on a 2009 Nissan Sentra include a faulty ECT sensor, a short or open circuit in the sensor wiring, a corroded connector, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the cause of OBDII code P0118 on my 2009 Nissan Sentra?

To diagnose the cause of OBDII code P0118 on a 2009 Nissan Sentra, you can start by checking the ECT sensor wiring, inspecting the sensor for any physical damage, testing the sensor's resistance, and scanning for any additional trouble codes.

5. Can I still drive my 2009 Nissan Sentra with OBDII code P0118?

It is not recommended to drive your 2009 Nissan Sentra with OBDII code P0118, as it can lead to potential engine damage due to overheating or poor fuel mixture. It is best to address the issue promptly.

6. How can I repair OBDII code P0118 on my 2009 Nissan Sentra?

To repair OBDII code P0118 on a 2009 Nissan Sentra, you may need to replace the Engine Coolant Temperature sensor, repair any damaged wiring, clean or replace corroded connectors, or reset the ECM after fixing the issue.

7. Can a DIY enthusiast fix OBDII code P0118 on a 2009 Nissan Sentra?

If you have the necessary tools and automotive knowledge, you may be able to fix OBDII code P0118 on a 2009 Nissan Sentra yourself by following a repair manual or online guides. However, it is recommended to seek professional help if you are unsure.

8. How much does it cost to repair OBDII code P0118 on a 2009 Nissan Sentra?

The cost to repair OBDII code P0118 on a 2009 Nissan Sentra can vary depending on the cause of the issue and whether you choose to replace the sensor yourself or have a mechanic do the repairs. Costs can range from $50 to $200 or more.

9. Will resetting the OBDII code P0118 on my 2009 Nissan Sentra make it go away permanently?

Resetting the OBDII code P0118 on a 2009 Nissan Sentra may temporarily turn off the check engine light, but if the underlying issue causing the code is not fixed, the code is likely to reappear. It is essential to address the root cause of the problem.

10. Is OBDII code P0118 a serious issue on a 2009 Nissan Sentra?

OBDII code P0118 on a 2009 Nissan Sentra should be taken seriously, as it can lead to engine overheating, poor performance, and potential damage if left unresolved. It is recommended to address the issue promptly to prevent further problems.

Discuss the causes and fixes for P0118 2009 Nissan Sentra OBDII Code

Submit a New Comment

Code P0118 2009 Nissan Sentra comments

No comments found for this page.