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P0112 2008 Toyota Prius Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2008 Toyota Prius indicates an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. Common causes include Faulty IAT sensor: The sensor itself may be malfunctioning, providing inaccurate temperature readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the IAT sensor to the ECM can disrupt the signal, ECM problems: A malfunctioning ECM may struggle to interpret the data from the IAT sensor correctly. 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 2008 Toyota Prius indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor: The sensor itself may be malfunctioning, providing inaccurate temperature readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the IAT sensor to the ECM can disrupt the signal, ECM problems: A malfunctioning ECM may struggle to interpret the data from the IAT sensor correctly.
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 2008 Toyota Prius Description

The P0112 diagnostic trouble code (DTC) for a 2008 Toyota Prius indicates an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. The IAT sensor is responsible for measuring the temperature of the air entering the engine. This information is crucial for the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion and performance. When the ECM detects a low input signal from the IAT sensor, it can lead to various performance issues and potentially cause long-term damage if left unaddressed.

OBDII Code P0112 2008 Toyota Prius - Intake Air Temperature Circuit Low Input
P0112 2008 Toyota Prius Code - Intake Air Temperature Circuit Low Input

Common Causes of P0112 2008 Toyota Prius

  1. Faulty IAT sensor: The sensor itself may be malfunctioning, providing inaccurate temperature readings to the ECM.
  2. Wiring issues: Damaged or corroded wiring connecting the IAT sensor to the ECM can disrupt the signal.
  3. ECM problems: A malfunctioning ECM may struggle to interpret the data from the IAT sensor correctly.
  4. Intake air leaks: Leaks in the intake system can affect the IAT sensor's readings, leading to a low input signal.

Symptoms of P0112 2008 Toyota Prius

  1. Decreased fuel efficiency: A faulty IAT sensor can cause the ECM to inaccurately adjust the air-fuel mixture, leading to decreased fuel efficiency.
  2. Engine misfires: Incorrect air-fuel ratios can result in engine misfires, rough idling, or hesitation during acceleration.
  3. Check Engine Light: The illumination of the Check Engine Light is a common symptom of a P0112 code.
  4. Reduced engine performance: The engine may lack power or responsiveness due to incorrect air-fuel mixture settings.

How to Fix P0112 2008 Toyota Prius

  1. Diagnose the issue: Use a scan tool to retrieve the DTC and perform a visual inspection of the IAT sensor and its wiring.
  2. Test the IAT sensor: Check the sensor's resistance with a multimeter at different temperatures to determine if it is functioning correctly.
  3. Inspect wiring: Look for any damage or corrosion in the wiring harness and repair or replace as necessary.
  4. Replace the IAT sensor: If the sensor is faulty, replace it with a new one following the manufacturer's instructions.
  5. Clear the DTC: After completing the repair, clear the DTC with a scan tool and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P0112 2008 Toyota Prius

The cost of repairing a P0112 code on a 2008 Toyota Prius can vary depending on the specific cause of the issue. Typically, the price of a new IAT sensor ranges from $20 to $50, while labor costs for diagnosis and replacement can range from $100 to $200. Overall, the total repair cost could fall between $120 and $250. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0112 2008 Toyota Prius

Intake air temperature sensor is built into the mass air flow meter. Before doing anything else clean the mass air flow meter with mass air flow sensor cleaner and reset the light.

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 2008 Toyota Prius Code

1. What are the common symptoms of OBDII code P0112 in a 2008 Toyota Prius?

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

2. What does the OBDII code P0112 in a 2008 Toyota Prius indicate?

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

3. What are some possible causes of OBDII code P0112 in a 2008 Toyota Prius?

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

4. How can I diagnose the cause of OBDII code P0112 in my 2008 Toyota Prius?

You can use a multimeter to test the IAT sensor for proper resistance values, check the wiring and connectors for damage, and scan the ECM for any related error codes.

5. Can I drive my 2008 Toyota Prius with the OBDII code P0112 present?

It is not recommended to drive with the code present, as it can lead to decreased engine performance and potential damage if left unresolved.

6. How can I repair OBDII code P0112 in my 2008 Toyota Prius?

Repair options include replacing the faulty IAT sensor, repairing any damaged wiring or connectors, and resetting the ECM to clear the code.

7. Will resetting the ECM clear the OBDII code P0112 in a 2008 Toyota Prius?

Resetting the ECM may temporarily clear the code, but it is important to diagnose and fix the underlying issue to prevent the code from reappearing.

8. Is it possible to prevent OBDII code P0112 from occurring in a 2008 Toyota Prius?

Regular maintenance, including checking and replacing the IAT sensor as needed, can help prevent the code from occurring.

9. How long does it take to repair OBDII code P0112 in a 2008 Toyota Prius?

The repair time can vary depending on the exact cause of the code, but it typically takes around 1-2 hours to diagnose and fix the issue.

10. Can I reset the OBDII code P0112 in my 2008 Toyota Prius without fixing the underlying problem?

While you can clear the code temporarily, it is not recommended to ignore the underlying issue, as it can lead to further problems down the line.

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