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P0112 2009 Nissan Pathfinder Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2009 Nissan Pathfinder refers to the Intake Air Temperature (IAT) Circuit Low Input. Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, ECM malfunction. 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
P0112 2009 Nissan Pathfinder indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, ECM malfunction.
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 14, 2024
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Code P0112 2009 Nissan Pathfinder Description

The P0112 diagnostic trouble code (DTC) for a 2009 Nissan Pathfinder refers to the Intake Air Temperature (IAT) Circuit Low Input. This code indicates that the Engine Control Module (ECM) has detected a lower than expected voltage signal from the IAT sensor. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for determining the correct air-fuel mixture for combustion. When the ECM receives a low input signal from the IAT sensor, it can lead to various performance issues and potentially cause long-term damage if not addressed promptly.

OBDII Code P0112 2009 Nissan Pathfinder - Intake Air Temperature Circuit Low Input
P0112 2009 Nissan Pathfinder Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2009 Nissan Pathfinder

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the IAT circuit
  3. ECM malfunction
  4. Intake air leaks
  5. Incorrect IAT sensor placement

Symptoms of P0112 2009 Nissan Pathfinder

  1. Poor engine performance
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Issues with acceleration
  5. Check Engine Light illuminated

How to Fix P0112 2009 Nissan Pathfinder

  1. Begin by locating the IAT sensor in the intake air duct or manifold.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as needed.
  3. Test the IAT sensor using a multimeter to check for proper resistance values.
  4. If the sensor is faulty, replace it with a new one following manufacturer's guidelines.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0112 2009 Nissan Pathfinder

The typical repair costs for addressing a P0112 code on a 2009 Nissan Pathfinder can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as location, vehicle make and model, and engine type can also impact the overall repair costs.

What does this mean?

Tech Notes for P0112 2009 Nissan Pathfinder

Intake Air Temperature (IAT) sensor is built into the Mass Air Flow (MAF) sensor. Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.



When is the Code Detected?

An excessively low 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 P0112 2009 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0112 on a 2009 Nissan Pathfinder?

The common symptoms of OBDII code P0112 on a 2009 Nissan Pathfinder may include rough idling, poor fuel economy, lack of power, and in some cases, the Check Engine Light may illuminate.

2. What does the OBDII code P0112 "Intake Air Temperature Circuit Low Input" mean for a 2009 Nissan Pathfinder?

The OBDII code P0112 for a 2009 Nissan Pathfinder indicates that the Engine Control Module (ECM) has detected a low input signal from the Intake Air Temperature (IAT) sensor.

3. What are the possible causes of OBDII code P0112 on a 2009 Nissan Pathfinder?

The possible causes of OBDII code P0112 on a 2009 Nissan Pathfinder include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, or issues with the ECM.

4. How can I diagnose the OBDII code P0112 on my 2009 Nissan Pathfinder?

To diagnose the OBDII code P0112 on a 2009 Nissan Pathfinder, you can start by checking the IAT sensor and its wiring for any visible damage. You may also use a multimeter to test the sensor's resistance and voltage output.

5. Can I drive my 2009 Nissan Pathfinder with OBDII code P0112?

It is not recommended to drive your 2009 Nissan Pathfinder with OBDII code P0112 for an extended period, as it can lead to poor engine performance and potential long-term damage. It's best to address the issue promptly.

6. How do I repair OBDII code P0112 on a 2009 Nissan Pathfinder?

To repair OBDII code P0112 on a 2009 Nissan Pathfinder, you may need to replace the faulty IAT sensor, repair any damaged wiring or connectors in the circuit, or reset the ECM after fixing the issue.

7. Can a dirty air filter cause OBDII code P0112 on a 2009 Nissan Pathfinder?

A dirty air filter is unlikely to directly cause OBDII code P0112 on a 2009 Nissan Pathfinder. However, a clogged air filter can affect the overall engine performance and fuel efficiency, so it's essential to replace it regularly.

8. How much does it cost to fix OBDII code P0112 on a 2009 Nissan Pathfinder?

The cost to fix OBDII code P0112 on a 2009 Nissan Pathfinder can vary depending on the root cause of the issue. Replacing the IAT sensor or repairing wiring may cost between $50 to $200, excluding labor charges.

9. Will OBDII code P0112 on a 2009 Nissan Pathfinder affect emissions?

Yes, OBDII code P0112 on a 2009 Nissan Pathfinder may affect emissions by causing the engine to run inefficiently. It's important to address the issue to ensure the vehicle meets emission standards.

10. How long does it take to repair OBDII code P0112 on a 2009 Nissan Pathfinder?

The repair time for OBDII code P0112 on a 2009 Nissan Pathfinder can vary based on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and fix the problem.

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