AutoCodes – Honda – P1109 Honda

P1109 Honda 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 Common causes include Engine Control Module (ECM) outdated or incorrect software, Faulty Engine Control Module (ECM).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 Honda 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Common causes: Common causes include Engine Control Module (ECM) outdated or incorrect software, Faulty Engine Control Module (ECM).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 8,345

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 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
Comments
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Code P1109 Honda 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 Honda - BARO Sensor Circuit Out of Range High - AutoCodes.com — P1109 Honda Code - BARO Sensor Circuit Out of Range High

What does this mean?

What are the Possible Causes of the DTC P1109 Honda?

Engine Control Module (ECM) outdated or incorrect software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

How to Fix the DTC P1109 Honda?

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 Honda 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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Need Help with the Code?

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Information for Specific Honda Models

P1109 2008 Honda Accord — BARO Sensor Circuit Out of Range High
P1109 2009 Honda Accord — BARO Sensor Circuit Out of Range High
P1109 2010 Honda Accord — BARO Sensor Circuit Out of Range High

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.