P0108 Code BMW: Meaning, Causes, Symptoms and Fixes

BMW P0108 Code : Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High

If you’re a BMW owner and have encountered the P0108 code, you may be wondering what it means and how to fix it. As a car enthusiast, it’s important to understand the various diagnostic trouble codes that your vehicle may encounter. In this article, we’ll dive into the details of the BMW P0108 code, including its meaning, possible causes, symptoms, and fixes. By the end of this article, you’ll have a better understanding of what’s causing the issue and how to get your BMW back on the road. So, let’s get started!

Table of Contents

What Does the BMW P0108 Code Mean?

The BMW P0108 code is a diagnostic trouble code (DTC) that indicates a problem with the manifold absolute pressure/barometric pressure sensor circuit. This code is triggered when the engine control module (ECM) detects a high voltage signal from the sensor, indicating that the pressure in the intake manifold or ambient air is higher than expected. This can cause a variety of issues with the engine’s performance and fuel efficiency, and should be addressed as soon as possible to prevent further damage to the vehicle.

Signs and Symptoms of BMW P0108 Code

When the BMW P0108 code appears, it indicates that there is a problem with the Manifold Absolute Pressure/Barometric Pressure Sensor Circuit. This sensor is responsible for measuring the pressure inside the intake manifold and the surrounding atmosphere. When the sensor detects a high voltage signal, it triggers the P0108 code. Here are some of the signs and symptoms that you may experience when this code appears:

Check Engine Light: The most common symptom of the P0108 code is the illumination of the check engine light on the dashboard. This light indicates that there is a problem with the engine or emissions system.
Poor Engine Performance: When the sensor is not working correctly, it can cause the engine to run poorly. You may experience a lack of power, hesitation, or stalling when driving your BMW.
Reduced Fuel Efficiency: A faulty sensor can also cause your BMW to consume more fuel than usual. This can result in reduced fuel efficiency and higher fuel costs.
Difficulty Starting: In some cases, the P0108 code can make it difficult to start your BMW. You may need to crank the engine several times before it starts.
Idling Problems: A malfunctioning sensor can also cause your BMW to idle roughly or stall when idling.
Other Codes: In some cases, the P0108 code may trigger other codes related to the engine or emissions system. These codes may provide additional information about the underlying problem.

If you experience any of these symptoms, it is essential to have your BMW diagnosed by a qualified mechanic. Ignoring the P0108 code can lead to further damage to your vehicle and potentially costly repairs.

Possible Causes of BMW P0108 Code

Faulty MAP/BARO sensor: The most common cause of the P0108 code is a faulty MAP/BARO sensor. This sensor may be damaged or malfunctioning, causing it to send incorrect signals to the engine control module (ECM).
Wiring issues: The wiring that connects the MAP/BARO sensor to the ECM may be damaged, corroded, or disconnected. This can cause the ECM to receive incorrect signals from the sensor.
Vacuum leaks: A vacuum leak in the intake manifold or the surrounding hoses can cause the MAP/BARO sensor to receive incorrect pressure readings, leading to the P0108 code.
Faulty ECM: In rare cases, the ECM itself may be faulty and unable to receive or interpret the signals from the MAP/BARO sensor correctly.
Dirty air filter: A dirty air filter can restrict the airflow to the engine, causing the MAP/BARO sensor to receive incorrect pressure readings.
Faulty throttle body: A faulty throttle body can cause the engine to receive incorrect airflow, leading to incorrect pressure readings from the MAP/BARO sensor.
Faulty EGR valve: A faulty EGR valve can cause the engine to receive incorrect amounts of exhaust gas, leading to incorrect pressure readings from the MAP/BARO sensor.

If you are experiencing the P0108 code in your BMW, it is important to have it diagnosed and repaired as soon as possible. Ignoring this code can lead to further damage to your vehicle and potentially dangerous driving conditions. Contact a qualified BMW mechanic or repair shop to diagnose and fix the issue.

Fixes for BMW P0108 Code

If your BMW is showing the P0108 code, it means that there is an issue with the Manifold Absolute Pressure/Barometric Pressure Sensor Circuit. Here are some possible fixes for this problem:

Replace the MAP sensor: The most common fix for the P0108 code is to replace the MAP sensor. This sensor measures the pressure inside the intake manifold and sends that information to the engine control module (ECM). If the sensor is faulty, it can cause the ECM to think that there is too much pressure in the manifold, which triggers the P0108 code.
Check the wiring and connections: Sometimes, the issue may not be with the sensor itself, but with the wiring or connections that lead to it. Check for any loose or damaged wires, and make sure that the connections are clean and secure.
Clean the throttle body: A dirty throttle body can also cause the P0108 code to appear. If the throttle body is clogged with dirt and debris, it can affect the airflow and pressure in the intake manifold. Cleaning the throttle body can help to resolve this issue.
Replace the ECM: In rare cases, the issue may be with the ECM itself. If the ECM is not receiving accurate information from the MAP sensor, it may trigger the P0108 code. In this case, replacing the ECM may be necessary.
Check for vacuum leaks: Vacuum leaks can also cause the P0108 code to appear. If there is a leak in the intake manifold or vacuum lines, it can affect the pressure readings that the MAP sensor is sending to the ECM. Check for any leaks and repair them as necessary.

If you are not comfortable diagnosing and fixing the issue yourself, it is recommended to take your BMW to a qualified mechanic or repair shop. They will have the tools and expertise to properly diagnose the problem and recommend the best course of action.

How Much Will It Take to Fix BMW P0108 Code?

The cost of fixing the BMW P0108 code can vary depending on the severity of the issue and the type of repair needed. In general, the cost can range from $100 to $500 or more.

If the issue is related to a faulty sensor, replacing the sensor may be enough to fix the problem. The cost of a new sensor can range from $50 to $200, depending on the make and model of the vehicle. Labor costs for replacing the sensor can range from $50 to $150, depending on the mechanic’s hourly rate and the complexity of the repair.

If the issue is related to a wiring or circuit problem, the cost can be higher. The mechanic may need to spend more time diagnosing the issue and repairing the wiring or circuit. This can result in higher labor costs, which can range from $100 to $300 or more.

In any case, it is important to have the issue diagnosed and repaired as soon as possible to prevent further damage to the vehicle and ensure safe driving.

Possible Causes and Fixes of Code P0108

Possible Cause	Fix	Cost to Fix
Failed Manifold Absolute Pressure (MAP) Sensor	Replace MAP sensor	$50-$200
Wiring or Connector Issues	Repair or replace wiring or connector	$50-$200
Failed Engine Control Module (ECM)	Replace ECM	$500-$1000
Vacuum Leak	Repair or replace vacuum lines or components	$100-$500
Failed Barometric Pressure Sensor	Replace barometric pressure sensor	$50-$200

Preventing BMW P0108 Code

Preventing the BMW P0108 code from appearing is essential to keep your vehicle running smoothly. Here are some preventive measures you can take:

Regular Maintenance: Regular maintenance of your BMW vehicle is crucial to prevent any issues from arising. Make sure to follow the manufacturer’s recommended maintenance schedule and get your vehicle serviced regularly.
Clean Air Filter: A dirty air filter can cause the engine to work harder, leading to a high-pressure reading. Make sure to clean or replace the air filter regularly to prevent this issue.
Check Vacuum Hoses: Vacuum hoses can become cracked or damaged over time, causing a leak in the system. Check the vacuum hoses regularly and replace any damaged hoses to prevent the code from appearing.
Check Wiring Connections: Loose or damaged wiring connections can cause the sensor to malfunction, leading to a high-pressure reading. Check the wiring connections regularly and repair any damaged connections.
Use Quality Fuel: Poor quality fuel can cause the engine to work harder, leading to a high-pressure reading. Make sure to use quality fuel to prevent this issue.
Use OEM Parts: Using OEM parts for repairs and replacements can ensure that the parts are compatible with your BMW vehicle and prevent any issues from arising.
Drive Responsibly: Aggressive driving can cause the engine to work harder, leading to a high-pressure reading. Drive responsibly and avoid harsh acceleration or braking to prevent this issue.

By following these preventive measures, you can reduce the risk of the BMW P0108 code appearing and keep your vehicle running smoothly. However, if the code does appear, it is essential to get your vehicle diagnosed and repaired by a qualified mechanic to prevent any further damage to the engine.

How Serious is the BMW P0108 Code?

The BMW P0108 code is a serious issue that should not be ignored. This code indicates a problem with the Manifold Absolute Pressure/Barometric Pressure Sensor Circuit, which is responsible for measuring the pressure inside the intake manifold of the engine. If this sensor is not functioning properly, it can cause a variety of problems with the engine’s performance and fuel efficiency.

Some of the symptoms of the BMW P0108 code include a decrease in engine power, poor acceleration, rough idling, and stalling. In addition, the vehicle may experience a decrease in fuel efficiency and an increase in emissions. If left untreated, this code can cause serious damage to the engine and other components of the vehicle.

The causes of the BMW P0108 code can vary, but some of the most common include a faulty sensor, a damaged wiring harness, or a problem with the engine’s vacuum system. To fix this issue, it is important to have the vehicle diagnosed by a qualified mechanic who can identify the root cause of the problem and make the necessary repairs.

In conclusion, the BMW P0108 code is a serious issue that should not be ignored. If you are experiencing any of the symptoms associated with this code, it is important to have your vehicle diagnosed and repaired as soon as possible to avoid further damage and ensure the safety of yourself and others on the road.

Can You Still Drive with the BMW P0108 Code?

It is not recommended to drive your BMW with the P0108 code as it can cause serious damage to your vehicle’s engine and emissions system. The code indicates that there is a problem with the Manifold Absolute Pressure/Barometric Pressure Sensor Circuit, which is responsible for measuring the air pressure in the engine’s intake manifold. This information is used by the engine control module to adjust the fuel injection and ignition timing to ensure optimal performance and fuel efficiency.

If the sensor is malfunctioning, it can cause the engine to run too rich or too lean, which can lead to poor fuel economy, reduced power, and increased emissions. In some cases, the engine may even stall or fail to start. Therefore, it is important to have the issue diagnosed and repaired as soon as possible to avoid further damage to your BMW.

It is recommended to have your BMW towed to a repair shop or mechanic if you experience any symptoms related to the P0108 code, such as rough idle, hesitation, or loss of power. Driving your vehicle with a malfunctioning sensor can cause irreversible damage to your engine and emissions system, resulting in costly repairs.

Conclusion

If you are experiencing the P0108 code on your BMW, it is important to address the issue as soon as possible to avoid further damage to your vehicle. The code indicates a problem with the manifold absolute pressure/barometric pressure sensor circuit, which can cause a variety of symptoms such as poor fuel economy, rough idling, and decreased engine performance. The causes of the code can range from a faulty sensor to a damaged wiring harness, and the fixes may include replacing the sensor or repairing the wiring. It is recommended to seek the help of a professional mechanic to diagnose and fix the issue. By addressing the P0108 code promptly, you can ensure your BMW is running smoothly and efficiently on the road.

FAQ

What does the BMW P0108 code mean?

The BMW P0108 code refers to a problem with the Manifold Absolute Pressure/Barometric Pressure Sensor Circuit, indicating that the sensor is reading a high voltage signal.

What are the symptoms of a BMW P0108 code?

The symptoms of a BMW P0108 code may include poor acceleration, rough idling, stalling, and decreased fuel efficiency.

What are the possible causes of a BMW P0108 code?

The possible causes of a BMW P0108 code may include a faulty sensor, damaged wiring or connectors, a vacuum leak, or a problem with the engine control module.

How is a BMW P0108 code diagnosed?

A BMW P0108 code can be diagnosed using an OBD-II scanner, which will read the code and provide information about the problem. A mechanic may also perform a visual inspection of the sensor and its wiring to check for any obvious issues.

Can a BMW P0108 code be fixed at home?

While it is possible to fix a BMW P0108 code at home, it is recommended to have a professional mechanic diagnose and repair the issue to ensure proper repairs are made.

How much does it cost to fix a BMW P0108 code?

The cost to fix a BMW P0108 code will vary depending on the cause of the problem and the location of the repair. On average, repairs can cost anywhere from $100 to $500.

How can I prevent a BMW P0108 code from occurring?

To prevent a BMW P0108 code from occurring, it is important to keep up with regular maintenance, including replacing air filters and checking for vacuum leaks. It is also important to address any issues with the engine or sensors as soon as they arise.

Learn about other similar BMW Fault Codes from our BMW OBD 2 Fault Code List.