AutoCodes – Ford – P0112 2009 Ford Fusion

P0112 2009 Ford Fusion Code - Intake Air Temperature Sensor Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT) sensor is built into Mass Air Flow (MAF) sensor. Common causes include Dirty Air Filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted. 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 Ford Fusion indicates Intake Air Temperature Sensor Circuit Low Input.
Common causes: Common causes include Dirty Air Filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted.
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.

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Code Popularity 2,667

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0112 2009 Ford Fusion Description

The Intake Air Temperature (IAT) sensor is built into Mass Air Flow (MAF) sensor. The sensor detects intake air temperature and transmits a signal to the Powertrain Control Module (PCM). The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle. It is used by the Powertrain Control Module to assist with the calculation of idle speed, fuel mixture, and spark advance. The Diagnostic Trouble Code (DTC) will set when the PCM detects an excessively low voltage from the sensor.

OBDII Code P0112 2009 Ford Fusion - Intake Air Temperature Sensor Circuit Low Input - AutoCodes.com — P0112 2009 Ford Fusion Code - Intake Air Temperature Sensor Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 2009 Ford Fusion?

Dirty Air Filter
Faulty Intake Air Temperature (IAT) Sensor
Intake Air Temperature Sensor harness is open or shorted
Intake Air Temperature Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0112 2009 Ford Fusion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Before replacing the Mass Air Flow (MAF) sensor, try replacing the air filter and cleaning the Mass Air Flow sensor with Mass Air Flow sensor cleaner. Reset code and drive the vehicle. If the code comes back, it may be necessary to replace the Mass Air Flow sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 2009 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0112 2009 Ford Fusion code?

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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 Ford Fusion Code

1. What are the common symptoms of OBDII code P0112 on a 2009 Ford Fusion?

- Common symptoms include poor fuel economy, rough idling, engine stalling, and a decrease in overall engine performance.

2. What does the OBDII code P0112 indicate on a 2009 Ford Fusion?

- The code P0112 indicates a low input signal from the Intake Air Temperature (IAT) sensor circuit.

3. What are the possible causes of the Intake Air Temperature Sensor Circuit Low Input code (P0112) on a 2009 Ford Fusion?

- Possible causes include a faulty IAT sensor, damaged wiring or connectors in the sensor circuit, or a problem with the Engine Control Module (ECM).

4. How can I diagnose the cause of the P0112 code on my 2009 Ford Fusion?

- To diagnose the issue, you can use a multimeter to test the IAT sensor's resistance, check for any wiring or connector damage, and scan the ECM for any related trouble codes.

5. Can I drive my 2009 Ford Fusion with the P0112 code present?

- It is not recommended to drive your vehicle with the P0112 code, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair the Intake Air Temperature Sensor Circuit Low Input code (P0112) on my 2009 Ford Fusion?

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

7. Will resetting the ECM clear the P0112 code on my 2009 Ford Fusion?

- Resetting the ECM may temporarily clear the code, but if the underlying issue causing the P0112 code persists, the code is likely to return.

8. How much does it typically cost to repair the P0112 code on a 2009 Ford Fusion?

- The cost of repairing the P0112 code can vary depending on the cause of the issue, but it may range from $50 to $200 for parts and labor.

9. Can a DIY enthusiast fix the P0112 code on a 2009 Ford Fusion?

- Yes, a knowledgeable DIY enthusiast with the right tools and experience can potentially diagnose and repair the P0112 code on a 2009 Ford Fusion.

10. How important is it to address the P0112 code promptly on a 2009 Ford Fusion?

- It is important to address the P0112 code promptly to prevent further engine damage, ensure optimal fuel efficiency, and maintain overall vehicle performance.