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Engine-Codes – Nissan – P0118 2012 Nissan Sentra

P0118 2012 Nissan Sentra Code - Engine Coolant Temperature Sensor Circuit High

Quick Answer

The P0118 code for a 2012 Nissan Sentra indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit reading higher than normal. Common causes include Faulty ECT sensor, Corrosion or damage to the sensor's wiring or connectors, Coolant level is low or contaminated. 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 2012 Nissan Sentra indicates Engine Coolant Temperature Sensor Circuit High.
Common causes
Common causes include Faulty ECT sensor, Corrosion or damage to the sensor's wiring or connectors, Coolant level is low or contaminated.
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 Aug 30, 2024
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Code P0118 2012 Nissan Sentra Description

The P0118 code for a 2012 Nissan Sentra indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit reading higher than normal. The ECT sensor is responsible for monitoring the engine's temperature and sending this information to the engine control module (ECM). When the sensor detects a high voltage signal, it triggers the P0118 code. This issue can lead to inaccurate temperature readings, which can affect the engine's performance, fuel efficiency, and emissions control.

OBDII Code P0118 2012 Nissan Sentra - Engine Coolant Temperature Sensor Circuit High
P0118 2012 Nissan Sentra Code - Engine Coolant Temperature Sensor Circuit High

Common Causes of P0118 2012 Nissan Sentra

  1. Faulty ECT sensor.
  2. Corrosion or damage to the sensor's wiring or connectors.
  3. Coolant level is low or contaminated.
  4. Thermostat not functioning properly.
  5. ECM issues.

Symptoms of P0118 2012 Nissan Sentra

  1. Check engine light illuminated on the dashboard.
  2. Engine overheating or running hotter than usual.
  3. Poor fuel economy.
  4. Rough idling or stalling.
  5. Difficulty starting the engine.

How to Fix P0118 2012 Nissan Sentra

  1. Begin by locating the ECT sensor, typically located near the thermostat housing.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the ECT sensor using a multimeter to check for proper resistance values.
  4. Replace the ECT sensor if it is found to be faulty.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0118 2012 Nissan Sentra

The cost of repairing a P0118 code on a 2012 Nissan Sentra can vary depending on the root cause of the issue. In general, the price range for parts such as an ECT sensor can be between $20 to $100, with labor costs ranging from $80 to $150 per hour. The total repair cost could fall anywhere between $100 to $300, but it's advisable to consult with a local auto repair shop for a more accurate estimate.

What does this mean?

Tech Notes for P0118 2012 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.

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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 2012 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0118 in a 2012 Nissan Sentra?

The common symptoms include the engine overheating, a decrease in fuel efficiency, rough idling, and the temperature gauge showing abnormally high readings.

2. What causes the OBDII code P0118 in a 2012 Nissan Sentra?

The most common cause of the P0118 code in a 2012 Nissan Sentra is a faulty engine coolant temperature (ECT) sensor or a problem with the ECT sensor circuit.

3. How can I diagnose the issue causing the OBDII code P0118 in my 2012 Nissan Sentra?

You can diagnose the issue by checking the ECT sensor for proper operation, inspecting the sensor wiring for damage or loose connections, and testing the coolant temperature sensor circuit for continuity.

4. Can a bad thermostat trigger the OBDII code P0118 in a 2012 Nissan Sentra?

Yes, a malfunctioning thermostat can potentially cause the engine coolant temperature to rise too high, triggering the P0118 code in your 2012 Nissan Sentra.

5. Is it safe to continue driving my 2012 Nissan Sentra with the OBDII code P0118 active?

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

6. How do I reset the OBDII code P0118 in my 2012 Nissan Sentra after making repairs?

You can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes. However, the code may return if the underlying issue is not fixed.

7. Can a dirty or low coolant level trigger the OBDII code P0118 in a 2012 Nissan Sentra?

Yes, low coolant levels or dirty coolant can affect the ECT sensor's readings and potentially trigger the P0118 code in your 2012 Nissan Sentra.

8. What are some DIY repair tips for fixing the OBDII code P0118 in a 2012 Nissan Sentra?

DIY repair tips include checking and cleaning the ECT sensor, inspecting the sensor wiring for damage, ensuring proper coolant levels, and testing the thermostat for proper operation.

9. How much does it typically cost to repair the OBDII code P0118 in a 2012 Nissan Sentra at a mechanic or dealership?

The cost of repairing the P0118 code can vary depending on the exact cause of the issue. It may range from $100 to $300 for parts and labor at a mechanic or dealership.

10. Can a faulty ECU (Engine Control Unit) cause the OBDII code P0118 in a 2012 Nissan Sentra?

While it's less common, a malfunctioning ECU can potentially cause erroneous readings from the ECT sensor, leading to the activation of the P0118 code in your 2012 Nissan Sentra.

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