AutoCodes – Generic – P1109

P1109 Code - BARO Sensor Circuit Out of Range High

Quick Answer

The Barometric Pressure (BARO) sensor is built into the Engine Control Module (ECM) and monitors atmospheric pressure. Common causes include Engine Control Module (ECM) outdated or incorrect software, Faulty Engine Control Module (ECM). 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 indicates BARO Sensor Circuit Out of Range High.
Common causes: Common causes include Engine Control Module (ECM) outdated or incorrect software, Faulty Engine Control Module (ECM).
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 23,271

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 Apr 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1109 Description

The Barometric Pressure (BARO) sensor is built into the Engine Control Module (ECM) and monitors atmospheric pressure. The ECM estimates appropriate intake airflow from the Manifold Absolute Pressure (MAP) sensor output voltage and BARO sensor output voltage. If the BARO sensor output voltage is a specified value or more, the ECM detects a malfunction and a code is stored.

OBDII Code P1109 - BARO Sensor Circuit Out of Range High - AutoCodes.com — P1109 Code - BARO Sensor Circuit Out of Range High

What does this mean?

What are the Possible Causes of the DTC P1109?

Engine Control Module (ECM) outdated or incorrect software
Faulty Engine Control Module (ECM)

How to Fix the DTC P1109?

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 P1109 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 P1109 code?

Need more information on how to fix the P1109 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1109 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1109 Acura — BARO Sensor Circuit Out of Range High
P1109 Audi — HO2S22 Sensor Circuit Voltage Too Low Air Leak
P1109 Buick — Secondary Port Throttle System
P1109 Cadillac — Secondary Port Throttle System
P1109 Chevrolet — Secondary Port Throttle System
P1109 Ford — IAT Sensor 2 Intermittent Condition
P1109 GMC — Secondary Port Throttle System
P1109 Honda — BARO Sensor Circuit Out of Range High
P1109 Hyundai — Fuel Pump - Abnormal
P1109 Volkswagen — HO2S22 Sensor Circuit Voltage Too Low Air Leak

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 Code

1. What are the common symptoms of OBDII code P1109 (BARO Sensor Circuit Out of Range High)?

- Common symptoms include rough idling, reduced engine performance, and potential stalling.

2. What could cause the OBDII code P1109 to trigger?

- The code may be triggered by a faulty BARO (barometric pressure) sensor, a vacuum leak, or issues with the sensor's circuit.

3. How can I diagnose the cause of OBDII code P1109?

- Diagnostic steps may include checking the BARO sensor's voltage, inspecting for vacuum leaks, and testing the sensor's wiring for continuity.

4. Can a dirty air filter trigger code P1109?

- Yes, a dirty or clogged air filter can affect the barometric pressure readings and potentially trigger the P1109 code.

5. What are the potential repair options for fixing OBDII code P1109?

- Repair options may include replacing the BARO sensor, repairing any vacuum leaks, cleaning or replacing the air filter, and checking the sensor's wiring connections.

6. Is it safe to continue driving with OBDII code P1109 present?

- It is not recommended to continue driving with the P1109 code, as it can lead to further engine performance issues and potential damage if left unresolved.

7. Can a DIY enthusiast fix OBDII code P1109 at home?

- Depending on the cause of the code, some DIY enthusiasts may be able to fix it at home by following proper diagnostic procedures and replacing faulty components.

8. How much does it typically cost to repair OBDII code P1109 at a professional auto repair shop?

- Repair costs for OBDII code P1109 can vary depending on the exact cause, but it may range from $100 to $300 or more, including parts and labor.

9. Will resetting the OBDII system clear the P1109 code temporarily?

- Resetting the OBDII system may temporarily clear the P1109 code, but if the underlying issue is not fixed, the code is likely to return.

10. Can a mechanic use a scan tool to reset the P1109 code without fixing the issue?

- Yes, a mechanic can use a scan tool to clear the P1109 code, but it is important to address the root cause of the problem to prevent the code from reoccurring.