AutoCodes – Mitsubishi – P0129 Mitsubishi

P0129 Mitsubishi Code - Barometric Pressure Out Of Range Low

Quick Answer

The Engine Control Module (ECM) has detected an out of range signal from the Manifold Absolute Pressure (MAP) sensor Common causes include Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness open or shorted, Manifold Absolute Pressure (MAP) 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: P0129 Mitsubishi indicates Barometric Pressure Out Of Range Low.
Common causes: Common causes include Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness open or shorted, Manifold Absolute Pressure (MAP) 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 5,041

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0129 Mitsubishi Description

The Engine Control Module (ECM) has detected an out of range signal from the Manifold Absolute Pressure (MAP) sensor

OBDII Code P0129 Mitsubishi - Barometric Pressure Out Of Range Low - AutoCodes.com — P0129 Mitsubishi Code - Barometric Pressure Out Of Range Low

What does this mean?

What are the Possible Causes of the DTC P0129 Mitsubishi?

Faulty Manifold Absolute Pressure (MAP) sensor
Manifold Absolute Pressure (MAP) sensor harness open or shorted
Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection

How to Fix the DTC P0129 Mitsubishi?

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 P0129 Mitsubishi 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 P0129 Mitsubishi code?

Need more information on how to fix the P0129 Mitsubishi code? Get Access to Factory Service Manuals

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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 P0129 Mitsubishi Code

1. What does the OBDII code P0129 mean on a Mitsubishi?

P0129 indicates that the vehicleâ€™s Powertrain Control Module (PCM) has detected that the barometric pressure is lower than the expected range.

2. What are the common symptoms of code P0129 in a Mitsubishi?

Common symptoms include poor engine performance, reduced fuel efficiency, difficulty starting the engine, and potential stalling during operation.

3. What causes the P0129 code to appear in a Mitsubishi?

Possible causes include a faulty barometric pressure sensor, wiring or connection issues, a malfunctioning MAP sensor, or a problem with the vehicleâ€™s PCM.

4. Can a clogged air filter cause the P0129 code?

While unlikely, a severely clogged air filter might restrict airflow and contribute to performance issues, but the code is typically related to the barometric pressure sensor or its circuit.

5. How can I diagnose the P0129 code on my Mitsubishi?

Start by inspecting the barometric pressure sensor and its wiring for damage or corrosion. Compare live data from the barometric pressure sensor with atmospheric pressure using a scan tool.

6. Is it safe to drive a Mitsubishi with the P0129 code?

Driving with this code is not recommended, as it can lead to poor performance, inefficient fuel use, and potential engine stalling, which may compromise safety.

7. How do you fix the P0129 code on a Mitsubishi?

Repairs may include replacing the barometric pressure sensor, repairing damaged wiring, cleaning or replacing the MAP sensor, or reprogramming the PCM if necessary.

8. Does the P0129 code require sensor replacement?

Not always. Before replacing the sensor, check for wiring issues, poor connections, or other related faults that may trigger the code.

9. Can extreme weather conditions cause the P0129 code?

Yes, extreme altitude or weather changes can temporarily affect the barometric pressure reading, but persistent issues likely point to sensor or circuit problems.

10. Will clearing the P0129 code with a scan tool fix the problem?

Clearing the code may temporarily remove the warning light, but it will return if the underlying issue isnâ€™t resolved. Proper diagnostics and repairs are needed.