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P0112 20012 Nissan Sentra Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2012 Nissan Sentra indicates that there is a low input signal from the intake air temperature (IAT) sensor circuit. Common causes include Faulty IAT sensor, Wiring issues or corrosion in the IAT sensor circuit, Poor electrical connection at the IAT sensor. 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 20012 Nissan Sentra indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Wiring issues or corrosion in the IAT sensor circuit, Poor electrical connection at the IAT sensor.
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 Aug 30, 2024
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Code P0112 20012 Nissan Sentra Description

The P0112 diagnostic trouble code (DTC) for a 2012 Nissan Sentra indicates that there is a low input signal from the intake air temperature (IAT) sensor circuit. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for determining the air-fuel mixture. A low input signal suggests that the sensor is reporting a temperature that is lower than expected, which can lead to incorrect fuel calculations and potentially affect engine performance.

OBDII Code P0112 20012 Nissan Sentra - Intake Air Temperature Circuit Low Input
P0112 20012 Nissan Sentra Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 20012 Nissan Sentra

  1. Faulty IAT sensor
  2. Wiring issues or corrosion in the IAT sensor circuit
  3. Poor electrical connection at the IAT sensor
  4. Engine coolant temperature sensor malfunction
  5. ECM software issue

Symptoms of P0112 20012 Nissan Sentra

  1. Poor fuel economy
  2. Rough idling
  3. Reduced engine performance
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P0112 20012 Nissan Sentra

  1. Use a scan tool to verify the P0112 code and check the freeze frame data for more information.
  2. Inspect the wiring harness and connectors for any visible damage or corrosion.
  3. Test the IAT sensor using a multimeter to ensure it is functioning properly.
  4. Replace the faulty IAT sensor if necessary.
  5. Clear the DTC codes and perform a test drive to confirm the issue has been resolved.

Cost to Fix P0112 20012 Nissan Sentra

The cost estimate for repairing a P0112 code on a 2012 Nissan Sentra can vary depending on the specific cause of the issue. Generally, the cost of a new IAT sensor ranges from $20 to $50, while the labor cost for diagnosis and repair can range from $100 to $200. Overall, the total repair cost could range from $120 to $250. It's advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific circumstances.

What does this mean?

Tech Notes for P0112 20012 Nissan Sentra

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compressed air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replace 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 20012 Nissan Sentra Code

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

- Common symptoms include poor engine performance, rough idling, reduced fuel efficiency, and an illuminated Check Engine light.

2. What does the OBDII code P0112 indicate in a 2012 Nissan Sentra?

- The code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is reporting a low input to the Engine Control Module (ECM).

3. What are the possible causes of the P0112 code in a 2012 Nissan Sentra?

- Possible causes include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, a disconnected or corroded sensor, or a malfunctioning ECM.

4. How can I diagnose the cause of the P0112 code in my 2012 Nissan Sentra?

- To diagnose the issue, you can use a multimeter to test the IAT sensor's resistance, check the wiring and connectors for any damage, and inspect the sensor for physical damage or corrosion.

5. Can I drive my 2012 Nissan Sentra with the P0112 code present?

- It is not recommended to drive your vehicle with the P0112 code present, as it can lead to poor engine performance and potentially cause further damage to your engine.

6. How can I repair the P0112 code in my 2012 Nissan Sentra?

- Repairing the P0112 code typically involves replacing a faulty IAT sensor, repairing damaged wiring or connectors, or resetting the ECM after addressing any underlying issues.

7. Will resetting the Check Engine light fix the P0112 code in my 2012 Nissan Sentra?

- Resetting the Check Engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0112 code to appear.

8. Can a dirty air filter trigger the P0112 code in a 2012 Nissan Sentra?

- While a dirty air filter can affect engine performance, it is unlikely to trigger the P0112 code specifically. The code is usually related to the IAT sensor or its circuit.

9. How much does it cost to repair the P0112 code in a 2012 Nissan Sentra?

- The cost of repairing the P0112 code can vary depending on the cause of the issue and whether you choose to address it yourself or take it to a mechanic. Costs may include parts and labor.

10. Is the P0112 code a serious issue in a 2012 Nissan Sentra?

- While the P0112 code may not cause immediate harm to your vehicle, it is still important to address it promptly to prevent further damage and maintain optimal engine performance.

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