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Engine-Codes – Nissan – P0112 2012 Nissan Altima Sedan

P0112 2012 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for the 2012 Nissan Altima Sedan specifically refers to the Intake Air Temperature (IAT) Circuit Low Input. Common causes include Faulty or damaged IAT sensor, Loose or corroded electrical connections to the IAT sensor, Wiring issues or shorts in the IAT circuit. 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 2012 Nissan Altima Sedan indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty or damaged IAT sensor, Loose or corroded electrical connections to the IAT sensor, Wiring issues or shorts in the IAT circuit.
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 12, 2024
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Code P0112 2012 Nissan Altima Sedan Description

The P0112 diagnostic trouble code (DTC) for the 2012 Nissan Altima Sedan specifically refers to the Intake Air Temperature (IAT) Circuit Low Input. This code is triggered when the Engine Control Module (ECM) detects that the voltage signal from the IAT sensor is lower than the expected range. The IAT sensor measures the temperature of the incoming air into the engine, which is crucial for determining the air-fuel mixture and ignition timing. When the IAT sensor provides a low voltage signal, it can lead to incorrect calculations by the ECM, resulting in poor engine performance and efficiency.

OBDII Code P0112 2012 Nissan Altima Sedan - Intake Air Temperature Circuit Low Input
P0112 2012 Nissan Altima Sedan Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2012 Nissan Altima Sedan

  1. Faulty or damaged IAT sensor
  2. Loose or corroded electrical connections to the IAT sensor
  3. Wiring issues or shorts in the IAT circuit
  4. ECM software malfunction
  5. Intake air leaks near the IAT sensor

Symptoms of P0112 2012 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Hesitation during acceleration
  4. Check Engine Light illuminated
  5. Reduced engine performance

How to Fix P0112 2012 Nissan Altima Sedan

  1. Begin by locating the IAT sensor, typically near the air intake duct or air filter housing.
  2. Inspect the sensor and wiring for any visible damage, corrosion, or loose connections.
  3. Test the IAT sensor using a multimeter to verify its resistance values at different temperatures.
  4. If the sensor is faulty, replace it with a new one following manufacturer specifications.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0112 2012 Nissan Altima Sedan

The cost of repairing a P0112 code on a 2012 Nissan Altima Sedan can vary depending on the cause of the issue and the specific parts needed. Typically, the cost of a new IAT sensor ranges from $20 to $50, 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 advisable to check with local auto repair shops for a more accurate estimate.

What does this mean?

Tech Notes for P0112 2012 Nissan Altima Sedan

Intake Air Temperature (IAT) sensor is built into the mass air flow 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 2012 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0112 in a 2012 Nissan Altima Sedan?

The common symptoms include poor fuel economy, rough idling, stalling, and a decrease in engine performance.

2. What does the OBDII code P0112 on a 2012 Nissan Altima Sedan indicate?

The code P0112 indicates that there is a low input signal coming from the intake air temperature (IAT) sensor circuit.

3. What are the possible causes of OBDII code P0112 in a 2012 Nissan Altima Sedan?

Possible causes include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, or issues with the engine control module (ECM).

4. How can I diagnose the OBDII code P0112 in my 2012 Nissan Altima Sedan?

Diagnosing the code involves checking the IAT sensor for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to read data from the ECM.

5. Can a dirty air filter trigger the OBDII code P0112 in a 2012 Nissan Altima Sedan?

Yes, a dirty air filter can affect the IAT sensor readings and potentially trigger the P0112 code. It is recommended to check and replace the air filter if necessary.

6. Is it safe to continue driving with the OBDII code P0112 illuminated in a 2012 Nissan Altima Sedan?

It is not recommended to continue driving with the P0112 code as it can lead to poor engine performance and potential damage. It is best to address the issue promptly.

7. How can I reset the OBDII code P0112 in my 2012 Nissan Altima Sedan after making repairs?

You can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes. However, the code will likely reappear if the underlying issue is not fixed.

8. Can a DIY enthusiast repair the OBDII code P0112 in a 2012 Nissan Altima Sedan?

Depending on the cause, some DIY enthusiasts may be able to repair the issue by replacing the IAT sensor or fixing wiring problems. However, complex ECM-related issues may require professional assistance.

9. Will the OBDII code P0112 affect the emissions performance of a 2012 Nissan Altima Sedan?

Yes, the P0112 code can affect emissions performance by causing improper fuel-air mixture, which may lead to increased emissions. It is advisable to address the issue to maintain optimal emissions levels.

10. How much can I expect to pay for repairing the OBDII code P0112 in a 2012 Nissan Altima Sedan at a repair shop?

The cost of repairing the P0112 code can vary depending on the exact cause of the issue and labor rates. It is advisable to get a diagnostic assessment from a reputable repair shop for an accurate estimate.

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