OBD-II Code P0108 is defined as a Manifold Absolute Pressure Sensor/Barometric Pressure Circuit High Input. This code indicates that the voltage from the Manifold Absolute Pressure (MAP) Sensor is exceeding the expected range, which can lead to improper engine performance.
What Does the P0108 Code Mean?
The P0108 code means that the engine control module (PCM) has detected a high input from the MAP/Barometric Pressure Sensor. This sensor plays a crucial role in measuring air pressure inside the intake manifold, which is vital for calculating the correct air-fuel mixture for optimal engine performance.
What Causes the P0108 Code?
- Defective Manifold Absolute Pressure Sensor/Barometric Pressure Sensor
- Intake manifold vacuum leaks
- Faulty or corroded MAP Sensor wiring or connections
What Are the Symptoms of the P0108 Code?
- Check Engine Light illumination
- Hard starting and/or poor fuel economy
- Poor engine performance
How Serious Is the P0108 Code?
The P0108 code is classified as urgent. Ignoring this code can lead to significant engine damage or safety issues, so immediate action is necessary to diagnose and repair the underlying problems.
How to Diagnose the P0108 Code
To diagnose the P0108 code, follow these steps:
- Record freeze frame information when the code is set.
- Perform a test drive to replicate the conditions that triggered the code.
- Monitor engine load, throttle position, RPM, and road speed using a data streaming scan tool.
- Check the MAP sensor connector for a steady 5-volt reference voltage and a good ground.
- Conduct a vacuum pump voltage output test on the MAP sensor to verify functionality.
Common Repairs for the P0108 Code
- Replacing the defective MAP Sensor
- Repairing or replacing corroded wiring or connectors
- Fixing any vacuum leaks in the intake manifold
How Much Does It Cost to Fix the P0108 Code?
The cost to repair the P0108 code can vary significantly based on the cause of the issue. On average, repairs might range from $100 to $500, depending on whether a sensor replacement or more extensive repairs are needed.
Can I Fix the P0108 Code Myself?
If you have automotive repair experience and the necessary tools, you may be able to diagnose and fix the P0108 code yourself. However, due to the potential complexity of the issue, it is recommended to consult a professional mechanic for a thorough diagnosis and repair.
