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P0118 2005 Infiniti G35 Code - Engine Coolant Temperature Circuit High Input

Quick Answer

The P0118 code for a 2005 Infiniti G35 indicates a problem with the Engine Coolant Temperature (ECT) Circuit High Input. Common causes include Faulty ECT sensor, Wiring issues or a short circuit in the ECT circuit, Corrosion or poor connection at the ECT sensor or ECM. 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 2005 Infiniti G35 indicates Engine Coolant Temperature Circuit High Input.
Common causes
Common causes include Faulty ECT sensor, Wiring issues or a short circuit in the ECT circuit, Corrosion or poor connection at the ECT sensor or ECM.
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 15, 2024
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Code P0118 2005 Infiniti G35 Description

The P0118 code for a 2005 Infiniti G35 indicates a problem with the Engine Coolant Temperature (ECT) Circuit High Input. This means that the Engine Control Module (ECM) has detected a higher than normal voltage signal from the ECT sensor, which is responsible for monitoring the temperature of the engine coolant. The ECT sensor plays a crucial role in the engine's performance by providing data to the ECM to adjust fuel delivery and ignition timing based on the engine's operating temperature.

OBDII Code P0118 2005 Infiniti G35 - Engine Coolant Temperature Circuit High Input
P0118 2005 Infiniti G35 Code - Engine Coolant Temperature Circuit High Input

Common Causes of P0118 2005 Infiniti G35

  1. Faulty ECT sensor
  2. Wiring issues or a short circuit in the ECT circuit
  3. Corrosion or poor connection at the ECT sensor or ECM
  4. Coolant level too low or contaminated
  5. Faulty ECM

Symptoms of P0118 2005 Infiniti G35

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

How to Fix P0118 2005 Infiniti G35

  1. Begin by diagnosing the ECT sensor using a multimeter to check for proper resistance values.
  2. Inspect the wiring and connectors in the ECT circuit for any damage, corrosion, or loose connections.
  3. Test the coolant level and quality to ensure it is within the manufacturer's specifications.
  4. If the ECT sensor is faulty, replace it with a new one and clear the code from the ECM.
  5. Reset the ECM and perform a test drive to ensure the code does not return.

Cost to Fix P0118 2005 Infiniti G35

The cost of repairing a P0118 code on a 2005 Infiniti G35 can vary depending on the specific cause of the issue. Typically, the cost of a new ECT sensor ranges from $20 to $100, while labor costs can range from $80 to $150 per hour. Overall, the total repair cost for this issue could range from $100 to $300, including parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's recommended to check with local auto repair shops for a more accurate estimate.

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 2005 Infiniti G35 Code

1. What does OBDII code P0118 indicate in a 2005 Infiniti G35?

The code P0118 in a 2005 Infiniti G35 signifies an issue with the Engine Coolant Temperature (ECT) sensor circuit reporting a high input signal.

2. What are the common symptoms of OBDII code P0118 in a 2005 Infiniti G35?

Common symptoms of code P0118 in a 2005 Infiniti G35 may include engine overheating, poor fuel economy, rough idling, and an illuminated check engine light.

3. What are the possible causes of OBDII code P0118 in a 2005 Infiniti G35?

Potential causes of code P0118 in a 2005 Infiniti G35 include a faulty ECT sensor, a damaged ECT sensor connector, a corroded wiring harness, or a problem with the engine's cooling system.

4. How can I diagnose the issue related to OBDII code P0118 in my 2005 Infiniti G35?

To diagnose the problem associated with code P0118 in a 2005 Infiniti G35, you can use a scan tool to monitor the ECT sensor's readings, visually inspect the sensor and its wiring for any visible damage, and perform a resistance test on the sensor.

5. Can I drive my 2005 Infiniti G35 with OBDII code P0118?

It is not recommended to drive your 2005 Infiniti G35 with an unresolved P0118 code, as it can lead to potential engine damage due to incorrect temperature readings and improper fuel delivery.

6. How do I reset OBDII code P0118 in a 2005 Infiniti G35?

To reset the P0118 code in a 2005 Infiniti G35, you can use an OBDII scan tool to clear the code after addressing and fixing the underlying issue with the ECT sensor circuit.

7. Can a DIY enthusiast repair OBDII code P0118 in a 2005 Infiniti G35?

A DIY enthusiast with automotive knowledge and tools can potentially repair code P0118 in a 2005 Infiniti G35 by replacing the faulty ECT sensor, repairing damaged wiring, or fixing connector issues.

8. How much does it cost to fix OBDII code P0118 in a 2005 Infiniti G35 at a mechanic?

The cost of repairing code P0118 in a 2005 Infiniti G35 at a mechanic can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will OBDII code P0118 in a 2005 Infiniti G35 affect vehicle performance?

Yes, code P0118 in a 2005 Infiniti G35 can impact vehicle performance by causing issues such as poor fuel economy, engine overheating, and potential drivability problems.

10. How long does it take to fix OBDII code P0118 in a 2005 Infiniti G35?

The time required to fix code P0118 in a 2005 Infiniti G35 can vary based on the specific cause of the issue and the expertise of the individual performing the repair, but it typically takes between 1 to 2 hours for a professional mechanic.

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