AutoCodes – Ford – P0109 2003 Ford F150

P0109 2003 Ford F150 Code - BARO Sensor Circuit 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 2003 Ford F150 indicates BARO Sensor Circuit 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 4,463

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 2003 Ford F150 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 2003 Ford F150 - BARO Sensor Circuit Intermittent - AutoCodes.com — P0109 2003 Ford F150 Code - BARO Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0109 2003 Ford F150?

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 2003 Ford F150?

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 2003 Ford F150 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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P0109 in a 2003 Ford F150 related to the BARO sensor circuit intermittent issue?

- Common symptoms include rough idling, poor acceleration, reduced fuel efficiency, and potential stalling of the engine.

2. What could be the possible causes of the BARO Sensor Circuit Intermittent OBDII code P0109 in a 2003 Ford F150?

- Possible causes may include a faulty BARO sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

3. How can I diagnose the BARO Sensor Circuit Intermittent issue causing OBDII code P0109 in my 2003 Ford F150?

- A proper diagnosis involves using an OBDII scanner to read the code, checking the BARO sensor's wiring and connections, and testing the sensor's functionality using a multimeter.

4. Is it safe to continue driving my 2003 Ford F150 with OBDII code P0109 related to the BARO Sensor Circuit Intermittent issue?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage and potential safety hazards. It's best to address the problem promptly.

5. Can I repair the BARO Sensor Circuit Intermittent issue causing OBDII code P0109 in my 2003 Ford F150 myself?

- Depending on your mechanical skills and tools available, you may be able to replace the BARO sensor or repair wiring issues yourself. However, professional help is recommended for accurate diagnosis and repair.

6. Are there any quick fixes or temporary solutions for OBDII code P0109 related to the BARO Sensor Circuit Intermittent issue in a 2003 Ford F150?

- Quick fixes like resetting the ECM or clearing the code may temporarily eliminate the check engine light, but the underlying issue must be addressed to prevent further problems.

7. How much does it typically cost to repair the BARO Sensor Circuit Intermittent issue causing OBDII code P0109 in a 2003 Ford F150?

- The cost of repair can vary depending on the exact cause of the issue. It may range from $100 to $300 for parts and labor if a professional mechanic is involved.

8. What are the long-term effects of ignoring the BARO Sensor Circuit Intermittent issue triggering OBDII code P0109 in a 2003 Ford F150?

- Ignoring this issue can lead to poor engine performance, decreased fuel efficiency, and potential engine damage over time if left unresolved.

9. Can a faulty BARO sensor cause other issues besides triggering OBDII code P0109 in a 2003 Ford F150?

- Yes, a faulty BARO sensor can cause various engine performance issues, including rough idling, hesitation during acceleration, and incorrect air-fuel mixture leading to poor fuel economy.

10. Is there a recall or service bulletin related to the BARO Sensor Circuit Intermittent issue and OBDII code P0109 in a 2003 Ford F150?

- It's recommended to check with a Ford dealership or online resources for any relevant recalls or service bulletins related to this specific problem in your vehicle.