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P1109 2009 Honda Accord Code - BARO Sensor Circuit Out of Range High

Quick Answer

The P1109 diagnostic trouble code (DTC) for a 2009 Honda Accord indicates that the BARO (Barometric Pressure) sensor circuit is out of range high. Common causes include Faulty BARO sensor, Damaged wiring or connectors in the BARO sensor circuit, ECM software issues affecting BARO sensor readings. 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
P1109 2009 Honda Accord indicates BARO Sensor Circuit Out of Range High.
Common causes
Common causes include Faulty BARO sensor, Damaged wiring or connectors in the BARO sensor circuit, ECM software issues affecting BARO sensor readings.
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 17, 2024
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Code P1109 2009 Honda Accord Description

The P1109 diagnostic trouble code (DTC) for a 2009 Honda Accord indicates that the BARO (Barometric Pressure) sensor circuit is out of range high. The BARO sensor is responsible for measuring the atmospheric pressure outside the vehicle, which is crucial for the engine's air-fuel ratio calculations. When the BARO sensor circuit is out of range high, it means that the sensor is detecting a pressure that is higher than the expected range, which can lead to issues with the engine's performance.

OBDII Code P1109 2009 Honda Accord - BARO Sensor Circuit Out of Range High
P1109 2009 Honda Accord Code - BARO Sensor Circuit Out of Range High

Common Causes of P1109 2009 Honda Accord

  1. Faulty BARO sensor
  2. Damaged wiring or connectors in the BARO sensor circuit
  3. ECM software issues affecting BARO sensor readings
  4. Vacuum leaks affecting BARO sensor operation
  5. Environmental factors causing incorrect BARO sensor readings

Symptoms of P1109 2009 Honda Accord

  1. Decreased fuel efficiency
  2. Rough idling or engine misfires
  3. Hesitation or lack of power during acceleration
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P1109 2009 Honda Accord

  1. Use an OBD-II scanner to retrieve the trouble codes and verify the P1109 code for the BARO sensor circuit.
  2. Inspect the BARO sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Test the BARO sensor's output using a multimeter to ensure it is within the specified range. Replace the sensor if necessary.
  4. Clear the DTCs from the ECM memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix P1109 2009 Honda Accord

The typical repair costs for addressing a P1109 BARO Sensor Circuit Out of Range High code can vary depending on the specific cause of the issue. In general, replacing a faulty BARO sensor can cost between $50 and $150 for the part, with additional labor costs ranging from $100 to $200. However, if the problem is related to wiring or ECM issues, the repair costs may be higher. It is advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific diagnosis and repair needed. Keep in mind that labor rates can vary between different locations and types of repair facilities.

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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 P1109 2009 Honda Accord Code

1. What are the common symptoms of OBDII code P1109 on a 2009 Honda Accord?

- Common symptoms include rough idling, engine hesitation, poor fuel economy, and potential stalling.

2. What does the OBDII code P1109 on a 2009 Honda Accord signify?

- The code indicates a malfunction in the BARO (Barometric Pressure) Sensor Circuit, specifically an out-of-range high reading.

3. What are the possible causes of OBDII code P1109 on a 2009 Honda Accord?

- The code can be triggered by a faulty BARO sensor, a vacuum leak in the intake system, wiring issues, or a problem with the engine control module (ECM).

4. How can I diagnose the BARO sensor circuit issue in my 2009 Honda Accord?

- Use a scan tool to read the code and check the BARO sensor's voltage output. Inspect the sensor and its wiring for any visible damage or signs of wear.

5. Can I drive my 2009 Honda Accord with OBDII code P1109?

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

6. How can I repair OBDII code P1109 on my 2009 Honda Accord?

- Repair options include replacing the BARO sensor, fixing any vacuum leaks, repairing damaged wiring, or reprogramming the ECM if necessary.

7. Will resetting the OBDII code P1109 on a 2009 Honda Accord fix the issue?

- Resetting the code may temporarily turn off the Check Engine light, but it will not solve the underlying problem causing the BARO sensor circuit malfunction.

8. Can a DIY enthusiast fix OBDII code P1109 on a 2009 Honda Accord?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to diagnose and repair simpler causes like vacuum leaks, but sensor replacement and ECM issues are best left to professionals.

9. How much does it cost to repair OBDII code P1109 on a 2009 Honda Accord?

- The cost of repair can vary based on the specific cause, but it typically ranges from $100 to $300 for parts and labor.

10. What is the importance of addressing OBDII code P1109 promptly on a 2009 Honda Accord?

- Promptly addressing the code is crucial to prevent further engine damage, ensure optimal fuel efficiency, and maintain overall vehicle performance.

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