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P0125 2004 Infiniti G35 Code - Engine Coolant Temperature Sensor

Quick Answer

The P0125 code on a 2004 Infiniti G35 indicates a potential issue with the Engine Coolant Temperature Sensor (ECT). Common causes include Faulty ECT sensor, Wiring or connector issues, Coolant level or quality problems. 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
P0125 2004 Infiniti G35 indicates Engine Coolant Temperature Sensor.
Common causes
Common causes include Faulty ECT sensor, Wiring or connector issues, Coolant level or quality problems.
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 17, 2024
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Code P0125 2004 Infiniti G35 Description

The P0125 code on a 2004 Infiniti G35 indicates a potential issue with the Engine Coolant Temperature Sensor (ECT). This sensor is responsible for monitoring the temperature of the engine coolant and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing to ensure optimal engine performance and efficiency.

OBDII Code P0125 2004 Infiniti G35 - Engine Coolant Temperature Sensor
P0125 2004 Infiniti G35 Code - Engine Coolant Temperature Sensor

Common Causes of P0125 2004 Infiniti G35

  1. Faulty ECT sensor
  2. Wiring or connector issues
  3. Coolant level or quality problems
  4. Thermostat malfunction
  5. ECM software issues

Symptoms of P0125 2004 Infiniti G35

  1. Check engine light illuminated
  2. Poor fuel economy
  3. Rough idling
  4. Hesitation during acceleration
  5. Engine stalling

How to Fix P0125 2004 Infiniti G35

  1. Begin by diagnosing the issue using a scan tool to confirm the P0125 code and check the ECT sensor's readings.
  2. Inspect the ECT sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Check the coolant level and quality. Top up the coolant if necessary and ensure it is at the correct concentration.
  4. Test the thermostat to ensure it is functioning correctly. Replace it if needed.
  5. Clear the trouble code from the ECM's memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0125 2004 Infiniti G35

The cost of repairing a P0125 code on a 2004 Infiniti G35 can vary depending on the specific cause of the issue. Typically, the cost of replacing an ECT sensor ranges from $100 to $200, including parts and labor. Additional costs may apply if other components need to be replaced or if further diagnostics are required. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops can vary, so it's advisable to inquire about rates in your local area for a more precise cost estimate.

When is the Code Detected?

The voltage sent to Engine Control Module (ECM) from the Engine Coolant Temperature (ECT) sensor is not practical, even when some time has passed after starting the engine. The engine is taking too long to reach the normal temperature level.

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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 P0125 2004 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0125 in a 2004 Infiniti G35?

The common symptoms of OBDII code P0125 in a 2004 Infiniti G35 include the engine running hotter than usual, decreased fuel efficiency, and the Check Engine light illuminating on the dashboard.

2. What is the main cause of OBDII code P0125 in a 2004 Infiniti G35?

The main cause of OBDII code P0125 in a 2004 Infiniti G35 is usually a faulty engine coolant temperature sensor, which fails to accurately report the temperature of the coolant to the engine control module.

3. How can I diagnose a faulty engine coolant temperature sensor in a 2004 Infiniti G35?

To diagnose a faulty engine coolant temperature sensor in a 2004 Infiniti G35, you can use an OBDII scanner to read the code, visually inspect the sensor for any signs of damage or corrosion, and test the sensor's resistance with a multimeter.

4. Can a faulty thermostat cause OBDII code P0125 in a 2004 Infiniti G35?

Yes, a faulty thermostat can cause OBDII code P0125 in a 2004 Infiniti G35. A thermostat that is stuck open or closed can affect the engine coolant temperature sensor readings and trigger the code.

5. How can I repair OBDII code P0125 in a 2004 Infiniti G35?

To repair OBDII code P0125 in a 2004 Infiniti G35, you will need to replace the faulty engine coolant temperature sensor with a new one. Ensure that the new sensor is compatible with your vehicle model and properly calibrated.

6. Are there any tips to prevent OBDII code P0125 from recurring in a 2004 Infiniti G35?

To prevent OBDII code P0125 from recurring in a 2004 Infiniti G35, it is essential to perform regular maintenance on the cooling system, including flushing and replacing the coolant as recommended by the manufacturer.

7. Can driving with OBDII code P0125 in a 2004 Infiniti G35 cause further damage to the engine?

Driving with OBDII code P0125 in a 2004 Infiniti G35 can potentially cause further damage to the engine if the issue is left unresolved for an extended period. It is recommended to address the problem promptly to prevent any serious complications.

8. How long does it typically take to replace the engine coolant temperature sensor in a 2004 Infiniti G35?

The replacement of the engine coolant temperature sensor in a 2004 Infiniti G35 usually takes around 30 minutes to an hour, depending on the accessibility of the sensor and the tools available.

9. Is it safe to continue driving a 2004 Infiniti G35 with OBDII code P0125 if the engine is not overheating?

It is generally not recommended to continue driving a 2004 Infiniti G35 with OBDII code P0125, even if the engine is not overheating. Ignoring the issue can lead to other complications and potentially affect the performance of the vehicle.

10. How much does it cost to replace the engine coolant temperature sensor in a 2004 Infiniti G35?

The cost to replace the engine coolant temperature sensor in a 2004 Infiniti G35 can vary depending on the brand of the sensor and the labor rates of the repair shop. On average, the total cost, including parts and labor, can range from $100 to $200.

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