AutoCodes – Infiniti – P0118 2004 Infiniti G35

P0118 2004 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 2004 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 6,492

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 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 2004 Infiniti G35 - Engine Coolant Temperature Circuit High Input - AutoCodes.com — P0118 2004 Infiniti G35 Code - Engine Coolant Temperature Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0118 2004 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 2004 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 2004 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.

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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 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0118 in a 2004 Infiniti G35?

Typical symptoms include the engine temperature gauge reading high, engine overheating, lack of heat from the heater, and potential illumination of the check engine light.

2. What does the OBDII code P0118 indicate in a 2004 Infiniti G35?

Code P0118 signals a high input in the engine coolant temperature (ECT) circuit, which may lead to inaccurate temperature readings and affect the engine's performance.

3. What are the possible causes of OBDII code P0118 in a 2004 Infiniti G35?

Common causes include a faulty ECT sensor, damaged wiring or connectors in the ECT circuit, low coolant levels, a malfunctioning thermostat, or issues with the engine control module (ECM).

4. How can I diagnose OBDII code P0118 in my 2004 Infiniti G35?

Diagnosis typically involves checking the ECT sensor's resistance, inspecting the wiring and connectors for damage, verifying coolant levels, testing the thermostat, and scanning the ECM for related error codes.

5. Can I drive my 2004 Infiniti G35 with OBDII code P0118?

It is not recommended to drive your vehicle with code P0118 as it may lead to engine damage from overheating. It's advisable to address the issue promptly to prevent further complications.

6. How do I repair OBDII code P0118 in a 2004 Infiniti G35?

Repair options include replacing the ECT sensor, repairing or replacing damaged wiring/connectors, refilling coolant, replacing the thermostat if faulty, or addressing any ECM issues identified during diagnosis.

7. Will resetting the check engine light resolve OBDII code P0118 in my 2004 Infiniti G35?

While resetting the check engine light may temporarily clear the code, it will not fix the underlying issue causing code P0118. Proper diagnosis and repair are necessary to address the problem effectively.

8. Can a DIY enthusiast fix OBDII code P0118 in a 2004 Infiniti G35?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code P0118 by replacing the ECT sensor or addressing simple wiring issues. However, more complex repairs may require professional assistance.

9. How much does it cost to repair OBDII code P0118 in a 2004 Infiniti G35?

The cost of repair can vary based on the specific cause of code P0118. Replacing the ECT sensor or repairing wiring/connectors may cost a few hundred dollars, while addressing ECM issues or thermostat replacement could increase the repair cost.

10. Is OBDII code P0118 a common issue in 2004 Infiniti G35 vehicles?

While not extremely common, code P0118 can occur in 2004 Infiniti G35 models due to sensor or circuit issues. Regular maintenance and prompt attention to cooling system problems can help prevent this code from appearing.