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Engine-Codes – Toyota – P0112 Toyota

P0112 Toyota Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for Toyota vehicles indicates an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. Common causes include Faulty IAT sensor, Damaged or corroded wiring/connectors in the IAT sensor circuit, Intake air leaks near 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 Toyota indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Damaged or corroded wiring/connectors in the IAT sensor circuit, Intake air leaks near 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 Sep 09, 2024
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Code P0112 Toyota Description

The P0112 diagnostic trouble code (DTC) for Toyota vehicles indicates an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. The IAT sensor is a crucial component that measures the temperature of the air entering the engine. This information is essential for the Engine Control Module (ECM) to adjust the air-fuel mixture accordingly, ensuring optimal engine performance and fuel efficiency.

OBDII Code P0112 Toyota - Intake Air Temperature Circuit Low Input
P0112 Toyota Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 Toyota

  1. Faulty IAT sensor
  2. Damaged or corroded wiring/connectors in the IAT sensor circuit
  3. Intake air leaks near the IAT sensor
  4. ECM issues or faults
  5. Incorrect sensor calibration or programming

Symptoms of P0112 Toyota

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

How to Fix P0112 Toyota

  1. Locate the IAT sensor: The sensor is typically located on the air intake duct near the air filter housing.
  2. Inspect wiring and connectors: Check for any visible damage, corrosion, or loose connections in the IAT sensor circuit.
  3. Test the IAT sensor: Use a multimeter to check the sensor's resistance and voltage readings to determine if it is functioning correctly.
  4. Replace the IAT sensor: If the sensor is faulty, replace it with a new one following the manufacturer's recommendations.
  5. Clear the DTC: After replacing the sensor, clear the DTC using a diagnostic scanner to reset the ECM and monitor the system for any recurring issues.

Cost to Fix P0112 Toyota

The typical repair costs for addressing a P0112 code on a Toyota vehicle can vary depending on the specific model and year. The cost of a new IAT sensor ranges from $20 to $100, depending on the brand and quality. Labor costs for this repair can range from $100 to $200, depending on the shop's hourly rates. Overall, the total repair cost can be estimated to be between $120 and $300. It's important to keep in mind that additional diagnosis time and labor charges may apply, so it's advisable to consult with a trusted auto repair shop for a more accurate estimate.

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Information for Specific Toyota Models

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 Toyota Code

1. What are the common symptoms of OBDII code P0112 in a Toyota vehicle?

The common symptoms of code P0112 include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What does the OBDII code P0112 indicate in a Toyota vehicle?

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 OBDII code P0112 in a Toyota?

Possible causes of code P0112 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 in my Toyota?

You can diagnose code P0112 by using a scan tool to read the code, testing the IAT sensor, inspecting the wiring and connectors for damage, and checking the ECM for faults.

5. Can a dirty air filter trigger OBDII code P0112 in a Toyota?

Yes, a dirty air filter can disrupt the intake air temperature readings, potentially triggering code P0112. It is advisable to check and replace the air filter if necessary.

6. How can I repair OBDII code P0112 in my Toyota?

To repair code P0112, you may need to replace the faulty IAT sensor, repair any damaged wiring or connectors, or address any ECM issues causing the low input signal.

7. Is it safe to continue driving with OBDII code P0112 in a Toyota?

It is not recommended to continue driving with code P0112 unresolved, as it can lead to further engine issues and potential damage. It is best to address the problem promptly.

8. Can extreme weather conditions affect OBDII code P0112 in a Toyota?

Extreme weather conditions, such as very high or low temperatures, can impact the IAT sensor readings and potentially trigger code P0112. Ensure proper sensor functioning in such conditions.

9. How do I reset the OBDII code P0112 in my Toyota after making repairs?

After making necessary repairs, you can reset the OBDII code P0112 using an OBDII scan tool or by disconnecting the car's battery for a few minutes to clear the ECM memory.

10. Will code P0112 cause the check engine light to illuminate in a Toyota?

Yes, code P0112 will typically trigger the check engine light to illuminate in a Toyota vehicle, indicating a problem with the intake air temperature circuit.

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