AutoCodes – Ford – P0109 2012 Ford Fusion

P0109 2012 Ford Fusion Code - Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent

Quick Answer

The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection. 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: P0109 2012 Ford Fusion indicates Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent.
Common causes: Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection.
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 2,891

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 May 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0109 2012 Ford Fusion Description

The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, Barometric Pressure (BARO) and if equipped, turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.
The MAP sensor wiring includes 3 circuits. The Engine Control Module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAP Sensor voltage is failing intermittently.

OBDII Code P0109 2012 Ford Fusion - Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent - AutoCodes.com — P0109 2012 Ford Fusion Code - Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P0109 2012 Ford Fusion?

Faulty Manifold Absolute Pressure (MAP) Sensor
Manifold Absolute Pressure Sensor harness is open or shorted
Manifold Absolute Pressure Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0109 2012 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0109 2012 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.

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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 P0109 2012 Ford Fusion Code

1. What are the common symptoms of OBDII code P0109 in a 2012 Ford Fusion?

The common symptoms include rough idling, decreased engine performance, and stalling.

2. What does the OBDII code P0109 on a 2012 Ford Fusion indicate?

The code P0109 indicates an intermittent issue with the Manifold Absolute Pressure (MAP) or Barometric Pressure Sensor.

3. What are the possible causes of OBDII code P0109 in a 2012 Ford Fusion?

Possible causes include a faulty MAP sensor, wiring issues, a vacuum leak, or a problem with the sensor's electrical circuit.

4. How can I diagnose the cause of OBDII code P0109 in my 2012 Ford Fusion?

You can use a diagnostic scanner to retrieve the trouble code, visually inspect the sensor and wiring, perform a vacuum leak test, and test the sensor's electrical circuit for continuity.

5. Can I still drive my 2012 Ford Fusion with OBDII code P0109?

It is not recommended to drive the vehicle with an intermittent issue with the MAP sensor, as it can lead to further engine problems or safety issues.

6. How can I repair OBDII code P0109 in a 2012 Ford Fusion?

Repair options include replacing the faulty MAP sensor, repairing any damaged wiring, fixing vacuum leaks, or addressing any issues with the sensor's electrical circuit.

7. Will resetting the OBDII code P0109 in my 2012 Ford Fusion make it go away permanently?

Simply clearing the trouble code may temporarily remove the warning light, but the underlying issue causing the code will persist until properly diagnosed and repaired.

8. How much does it typically cost to fix OBDII code P0109 in a 2012 Ford Fusion?

The cost of fixing P0109 can vary based on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast fix OBDII code P0109 in a 2012 Ford Fusion?

Depending on your skill level and access to tools, you may be able to replace the MAP sensor or address wiring issues yourself. However, diagnosing the exact cause may require professional expertise.

10. Is OBDII code P0109 a common issue in 2012 Ford Fusion vehicles?

While not extremely common, issues with the MAP sensor leading to code P0109 can occur in 2012 Ford Fusion models and should be promptly addressed to avoid further damage.