AutoCodes – Nissan – P0118 2003 Nissan Altima Sedan

P0118 2003 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 2003 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 8,402

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 2003 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 2003 Nissan Altima Sedan - Engine Coolant Temperature Sensor Circuit High - AutoCodes.com — P0118 2003 Nissan Altima Sedan Code - Engine Coolant Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 2003 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 2003 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 2003 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 2003 Nissan Altima Sedan Code

1. What does OBDII code P0118 mean for my 2003 Nissan Altima Sedan?

- OBDII code P0118 indicates a high voltage reading from the Engine Coolant Temperature (ECT) sensor circuit in your vehicle.

2. What are the common symptoms of OBDII code P0118 in a 2003 Nissan Altima Sedan?

- Common symptoms include the engine running hotter than normal, poor fuel economy, and potentially a check engine light on the dashboard.

3. What are the possible causes of OBDII code P0118 in a 2003 Nissan Altima Sedan?

- The causes can range from a faulty ECT sensor, damaged wiring or connectors in the sensor circuit, to issues with the engine coolant itself.

4. How can I diagnose OBDII code P0118 in my 2003 Nissan Altima Sedan?

- You can diagnose this code by using a scan tool to read the code and data from the ECT sensor, checking the sensor's resistance, and inspecting the wiring for any visible damage.

5. Can I continue driving my 2003 Nissan Altima Sedan with OBDII code P0118?

- It is not recommended to continue driving with this code, as it can lead to overheating and potential engine damage. It is best to address the issue promptly.

6. How can I repair OBDII code P0118 in my 2003 Nissan Altima Sedan?

- Repairing this code may involve replacing the ECT sensor, repairing any damaged wiring or connectors, and ensuring the cooling system is functioning properly.

7. Are there any tips for preventing OBDII code P0118 in my 2003 Nissan Altima Sedan?

- Regular maintenance of your vehicle, including checking the cooling system, replacing the coolant as recommended, and addressing any cooling system issues promptly, can help prevent this code.

8. Is it possible to reset OBDII code P0118 in a 2003 Nissan Altima Sedan by disconnecting the battery?

- Disconnecting the battery may clear the code temporarily, but it is not a recommended method to address the underlying issue causing OBDII code P0118.

9. Can a DIY enthusiast repair OBDII code P0118 in a 2003 Nissan Altima Sedan?

- Depending on your skill level and access to tools, you may be able to replace the ECT sensor or check the wiring yourself. However, diagnosing and repairing complex issues may require professional help.

10. Does OBDII code P0118 affect the performance of a 2003 Nissan Altima Sedan?

- Yes, this code can impact the performance of the vehicle by causing issues with fuel delivery, engine timing, and overall engine efficiency.