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Engine-Codes – Subaru – P0112 Subaru

P0112 Subaru Code - Intake Air Temperature Circuit Low Input

Quick Answer

The P0112 code for Subaru vehicles indicates a problem with the Intake Air Temperature (IAT) sensor circuit, specifically a low input signal. Common causes include Faulty IAT sensor, Wiring issues in the IAT sensor circuit, Loose or corroded electrical connections. 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 Subaru indicates Intake Air Temperature Circuit Low Input.
Common causes
Common causes include Faulty IAT sensor, Wiring issues in the IAT sensor circuit, Loose or corroded electrical connections.
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 08, 2024
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Code P0112 Subaru Description

The P0112 code for Subaru vehicles indicates a problem 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 to optimize engine performance and fuel efficiency. When the ECM detects a low input signal from the IAT sensor, it may cause various issues with the vehicle's performance.

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

Common Causes of P0112 Subaru

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

Symptoms of P0112 Subaru

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

How to Fix P0112 Subaru

  1. Diagnose the issue by using a scan tool to read the code and testing the IAT sensor for proper functionality.
  2. Inspect the wiring and connectors in the IAT sensor circuit for any damage or corrosion.
  3. Replace the faulty IAT sensor if necessary.
  4. Clear the code and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis of the ECM or intake system may be required.

Cost to Fix P0112 Subaru

The cost of repairing a P0112 code in a Subaru vehicle can vary depending on the specific cause of the issue. On average, the cost of replacing an IAT sensor ranges from $50 to $150, depending on the brand and quality of the sensor. Labor costs for this repair can range from $80 to $150 per hour, and the total repair bill may range from $150 to $300 or more. It's important to note that these are rough estimates, and actual repair costs can vary based on the location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate.

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 Subaru Code

1. What are the common symptoms of OBDII code P0112 in a Subaru related to the Intake Air Temperature Circuit Low Input?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes triggering the OBDII code P0112 in a Subaru?

- The code P0112 in a Subaru is often caused by a faulty intake air temperature (IAT) sensor, damaged wiring or connectors, or issues with the engine control module (ECM).

3. How does a malfunctioning intake air temperature (IAT) sensor contribute to the OBDII code P0112 in a Subaru?

- A malfunctioning IAT sensor can provide incorrect readings to the ECM, leading to a low input signal error and triggering the P0112 code.

4. What are some diagnostic steps to identify the root cause of OBDII code P0112 in a Subaru?

- Diagnostic steps may include checking the IAT sensor for proper operation, inspecting the wiring and connectors for damage, and verifying the ECM functionality using a scan tool.

5. Can a dirty or contaminated intake air temperature (IAT) sensor cause the OBDII code P0112 in a Subaru?

- Yes, a dirty or contaminated IAT sensor can provide inaccurate readings, leading to a low input signal error and triggering the P0112 code.

6. How can I reset the OBDII code P0112 in a Subaru after repairing the underlying issue?

- The OBDII code P0112 can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the ECM's memory.

7. Are there any repair tips for addressing the OBDII code P0112 related to Intake Air Temperature Circuit Low Input in a Subaru?

- When repairing the P0112 code, ensure to use a high-quality replacement IAT sensor, check and repair any damaged wiring or connectors, and perform a thorough inspection of the intake air system.

8. Can driving with the OBDII code P0112 unresolved cause further damage to a Subaru's engine?

- Continuing to drive with the P0112 code unresolved can potentially lead to decreased engine performance, reduced fuel efficiency, and in some cases, further damage to engine components.

9. How crucial is it to address the OBDII code P0112 promptly in a Subaru?

- It is important to address the P0112 code promptly to prevent potential engine performance issues, improve fuel efficiency, and avoid further complications that may arise from driving with a faulty intake air temperature circuit.

10. Is it recommended to seek professional help for diagnosing and repairing the OBDII code P0112 in a Subaru?

- If you are not confident in diagnosing or repairing the P0112 code yourself, it is advisable to seek assistance from a qualified mechanic or Subaru dealership to ensure the issue is properly resolved.

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