AutoCodes – Nissan – P0118 2004 Nissan Altima Sedan

P0118 2004 Nissan Altima Sedan Code - Engine Coolant Temperature Sensor Circuit High

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 2004 Nissan Altima Sedan indicates Engine Coolant Temperature Sensor Circuit High.
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 5,446

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 2004 Nissan Altima Sedan 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 2004 Nissan Altima Sedan - Engine Coolant Temperature Sensor Circuit High - AutoCodes.com — P0118 2004 Nissan Altima Sedan Code - Engine Coolant Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 2004 Nissan Altima Sedan?

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 2004 Nissan Altima Sedan?

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 2004 Nissan Altima Sedan 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.

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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 2004 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0118 in a 2004 Nissan Altima Sedan?

- Common symptoms include the engine running hotter than usual, the temperature gauge reading high, and potential issues with fuel efficiency.

2. What does the "Engine Coolant Temperature Sensor Circuit High" mean for a 2004 Nissan Altima Sedan?

- This code indicates that the Engine Coolant Temperature Sensor is detecting a high voltage signal, suggesting a potential issue with the sensor or its circuit.

3. What are the possible causes of OBDII code P0118 in a 2004 Nissan Altima Sedan?

- Possible causes include a faulty Engine Coolant Temperature Sensor, a damaged sensor wiring harness, a malfunctioning thermostat, or issues with the engine's cooling system.

4. How can I diagnose the cause of OBDII code P0118 in my 2004 Nissan Altima Sedan?

- To diagnose the issue, you can use a multimeter to test the Engine Coolant Temperature Sensor's resistance, check the sensor wiring for any damage, and inspect the cooling system components for any issues.

5. How can I repair OBDII code P0118 in my 2004 Nissan Altima Sedan?

- Repair options include replacing the Engine Coolant Temperature Sensor, repairing or replacing damaged wiring, ensuring proper thermostat function, and checking and maintaining the cooling system.

6. Can driving with OBDII code P0118 in a 2004 Nissan Altima Sedan cause further damage?

- Driving with this code may lead to overheating issues, reduced fuel efficiency, and potential damage to the engine if not addressed promptly.

7. Can resetting the OBDII code P0118 in a 2004 Nissan Altima Sedan make it go away permanently?

- Simply resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear.

8. Is it safe to continue driving my 2004 Nissan Altima Sedan with OBDII code P0118?

- It is not recommended to drive with this code, as it can lead to overheating problems and potentially cause damage to the engine. It's best to address the issue promptly.

9. How much does it typically cost to repair OBDII code P0118 in a 2004 Nissan Altima Sedan?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from around $100 to $300 for parts and labor.

10. Can a DIY enthusiast fix OBDII code P0118 in a 2004 Nissan Altima Sedan?

- If you have experience with automotive repairs and the necessary tools, you may be able to diagnose and fix the issue yourself. However, if you're unsure, it's best to consult a professional mechanic for assistance.