AutoCodes – Ford – P0109 2011 Ford Fusion

P0109 2011 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 2011 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 2,519

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 2011 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 2011 Ford Fusion - Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent - AutoCodes.com — P0109 2011 Ford Fusion Code - Manifold Absolute Pressure/Barometric Pressure Sensor Intermittent

What does this mean?

What are the Possible Causes of the DTC P0109 2011 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 2011 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 2011 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 2011 Ford Fusion Code

1. What are the common symptoms of an intermittent Manifold Absolute Pressure/Barometric Pressure Sensor (MAP/BARO) on a 2011 Ford Fusion with OBDII code P0109?

The common symptoms include fluctuating engine performance, rough idling, poor fuel efficiency, and stalling.

2. What are the possible causes of OBDII code P0109 indicating an intermittent MAP/BARO sensor issue in a 2011 Ford Fusion?

Potential causes include a faulty sensor, damaged wiring or connectors, vacuum leaks, or issues with the engine control module (ECM).

3. How can I diagnose an intermittent MAP/BARO sensor problem triggering OBDII code P0109 on my 2011 Ford Fusion?

You can diagnose the issue by inspecting the sensor and its connections, checking for vacuum leaks, testing the sensor's voltage output, or using a scan tool to monitor sensor data.

4. Can I continue driving my 2011 Ford Fusion with OBDII code P0109 related to an intermittent MAP/BARO sensor issue?

It's not recommended to drive with this issue as it can lead to poor engine performance and potentially more severe problems if left unresolved.

5. What are some repair tips for fixing OBDII code P0109 on a 2011 Ford Fusion caused by an intermittent MAP/BARO sensor problem?

Repair tips include replacing the faulty sensor, repairing damaged wiring or connectors, fixing vacuum leaks, and resetting the ECM after the repair.

6. How much does it typically cost to repair an intermittent MAP/BARO sensor issue triggering OBDII code P0109 on a 2011 Ford Fusion?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Is the MAP sensor the same as the BARO sensor in a 2011 Ford Fusion when dealing with OBDII code P0109?

In some vehicles, including the 2011 Ford Fusion, the MAP sensor also serves as the BARO sensor, meaning they are integrated into one unit.

8. Can a dirty air filter cause OBDII code P0109 related to an intermittent MAP/BARO sensor on a 2011 Ford Fusion?

A dirty air filter may indirectly affect sensor readings, but it is not a direct cause of the P0109 code. It's essential to address the sensor issue separately.

9. How long does it typically take to fix an intermittent MAP/BARO sensor issue triggering OBDII code P0109 on a 2011 Ford Fusion?

The repair time can vary based on the exact problem, but it usually takes around 1-2 hours for a professional technician to diagnose and fix the issue.

10. Can resetting the OBDII system clear the P0109 code caused by an intermittent MAP/BARO sensor problem on a 2011 Ford Fusion?

Resetting the system may temporarily clear the code, but if the underlying issue with the sensor persists, the code is likely to reappear. It's crucial to address the root cause of the problem for a lasting solution.