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Engine-Codes – Honda – P0112 2009 Honda Accord

P0112 2009 Honda Accord Code - Intake Air Temperature Circuit Low Voltage

Quick Answer

The P0112 code for a 2009 Honda Accord indicates a problem with the Intake Air Temperature (IAT) Circuit, specifically that the voltage is too low. Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged or corroded wiring in the IAT circuit, Loose or poor 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 2009 Honda Accord indicates Intake Air Temperature Circuit Low Voltage.
Common causes
Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged or corroded wiring in the IAT circuit, Loose or poor 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 Sep 10, 2024
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Code P0112 2009 Honda Accord Description

The P0112 code for a 2009 Honda Accord indicates a problem with the Intake Air Temperature (IAT) Circuit, specifically that the voltage is too low. The Intake Air Temperature sensor is responsible for measuring the temperature of the incoming air into the engine. This data is crucial for the engine control module (ECM) to adjust the air-fuel mixture and ignition timing for optimal performance and efficiency. When the voltage from the IAT sensor is too low, it can lead to incorrect readings and potentially cause issues with the engine's performance.

OBDII Code P0112 2009 Honda Accord - Intake Air Temperature Circuit Low Voltage
P0112 2009 Honda Accord Code - Intake Air Temperature Circuit Low Voltage

Common Causes of P0112 2009 Honda Accord

  1. Faulty Intake Air Temperature (IAT) sensor
  2. Damaged or corroded wiring in the IAT circuit
  3. Loose or poor connection at the IAT sensor
  4. Faulty Engine Control Module (ECM)
  5. Intake air leaks affecting the IAT sensor readings

Symptoms of P0112 2009 Honda Accord

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Engine running rough or misfiring
  4. Difficulty starting the engine
  5. Decreased overall engine performance

How to Fix P0112 2009 Honda Accord

  1. Begin by locating the Intake Air Temperature (IAT) sensor in the intake system.
  2. Inspect the wiring and connector for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the IAT sensor using a multimeter to ensure it is within the manufacturer's specified resistance range.
  4. If the sensor is faulty, replace it with a new one and clear the trouble codes.
  5. Reset the ECM by disconnecting the battery for a few minutes to clear the code and allow the ECM to relearn the correct values.

Cost to Fix P0112 2009 Honda Accord

The cost of repairing a P0112 code for a 2009 Honda Accord can vary depending on the specific cause of the issue. On average, the cost of replacing an Intake Air Temperature (IAT) sensor ranges from $50 to $150 for the part itself. Labor costs at an auto repair shop can range from $80 to $150 per hour. Overall, the total repair cost including parts and labor could range from $150 to $300. However, it is recommended to check with local auto repair shops for more accurate pricing based on your location and the specific diagnosis of the issue.

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 Honda Accord Code

1. What are the common symptoms of OBDII code P0112 on a 2009 Honda Accord?

The common symptoms include poor fuel efficiency, rough idling, and potential stalling of the engine.

2. What does the OBDII code P0112 indicate on a 2009 Honda Accord?

The code P0112 signifies that the Intake Air Temperature (IAT) sensor circuit is reporting a low voltage to the vehicle's engine control module.

3. What are the possible causes of OBDII code P0112 on a 2009 Honda Accord?

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

4. How can I diagnose the issue causing OBDII code P0112 on my 2009 Honda Accord?

You can use a multimeter to test the IAT sensor's resistance and voltage, check the wiring for any damages, and inspect the connectors for corrosion or loose connections.

5. Can a dirty air filter trigger OBDII code P0112 on a 2009 Honda Accord?

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

6. How can I repair OBDII code P0112 on my 2009 Honda Accord?

Repair options include replacing the faulty IAT sensor, repairing damaged wiring or connectors, and resetting the trouble code with an OBDII scanner after the issue is fixed.

7. Is it safe to continue driving with OBDII code P0112 present on a 2009 Honda Accord?

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

8. Can extreme weather conditions trigger OBDII code P0112 on a 2009 Honda Accord?

Extreme temperatures can impact the IAT sensor readings, potentially causing code P0112 to be triggered. Make sure to address any sensor issues promptly.

9. How much does it typically cost to repair OBDII code P0112 on a 2009 Honda Accord?

The cost of repair can vary depending on the exact cause of the issue. Replacing the IAT sensor or repairing wiring may cost between $100 to $300 at a repair shop.

10. Will resetting the trouble code make OBDII code P0112 disappear permanently on a 2009 Honda Accord?

Resetting the code will clear it temporarily, but if the underlying issue causing P0112 is not addressed, the code is likely to reappear during driving conditions.

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