AutoCodes – Infiniti – P0118 2003 Infiniti G35

P0118 2003 Infiniti G35 Code - Engine Coolant Temperature Circuit High Input

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 Infiniti G35 indicates Engine Coolant Temperature Circuit High Input.
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 7,040

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 Infiniti G35 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 Infiniti G35 - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2003 Infiniti G35 Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2003 Infiniti G35?

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 Infiniti G35?

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 Infiniti G35 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.

Need more information about the P0118 2003 Infiniti G35 code?

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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 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0118 in a 2003 Infiniti G35?

The common symptoms include the engine running hotter than normal, the temperature gauge reading incorrectly, and potential issues with the vehicle's fuel efficiency.

2. What does the OBDII code P0118 "Engine Coolant Temperature Circuit High Input" mean in a 2003 Infiniti G35?

This code indicates that the engine coolant temperature sensor is sending a signal to the engine control module (ECM) that is higher than expected.

3. What are the possible causes of OBDII code P0118 in a 2003 Infiniti G35?

Potential causes include a faulty engine coolant temperature sensor, a short or open in the sensor circuit, a malfunctioning ECM, or low coolant levels.

4. How can I diagnose the OBDII code P0118 in my 2003 Infiniti G35?

You can diagnose this code by checking the coolant level, inspecting the temperature sensor and its wiring for damage, and using a scan tool to monitor the sensor's readings.

5. Can I continue driving my 2003 Infiniti G35 with OBDII code P0118?

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

6. How can I repair OBDII code P0118 in my 2003 Infiniti G35?

Repair options include replacing the engine coolant temperature sensor, repairing any damaged wiring, or resetting the ECM after fixing the underlying issue.

7. Will resetting the OBDII code P0118 in my 2003 Infiniti G35 fix the problem?

Simply resetting the code without addressing the root cause, such as a faulty sensor or wiring issue, is unlikely to permanently resolve the problem. It's important to diagnose and fix the issue first.

8. How much does it typically cost to repair OBDII code P0118 in a 2003 Infiniti G35?

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

9. Can a DIY enthusiast fix OBDII code P0118 in a 2003 Infiniti G35?

Depending on your skill level and access to tools, you may be able to fix this issue yourself by replacing the engine coolant temperature sensor or repairing the wiring. However, professional diagnosis is recommended.

10. How often does OBDII code P0118 occur in a 2003 Infiniti G35?

While not extremely common, this code can occur due to various factors related to the engine coolant temperature sensor and its circuit, so it's important to address it promptly when it does occur.