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P0108 Mercedes-Benz Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Quick Answer

The P0108 diagnostic trouble code (DTC) for Mercedes-Benz indicates a high input signal from the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit. Common causes include Faulty MAP sensor, Wiring or connector issues in the MAP sensor circuit, Vacuum leaks in the intake system. 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
P0108 Mercedes-Benz indicates Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
Common causes
Common causes include Faulty MAP sensor, Wiring or connector issues in the MAP sensor circuit, Vacuum leaks in the intake system.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0108 Mercedes-Benz Description

The P0108 diagnostic trouble code (DTC) for Mercedes-Benz indicates a high input signal from the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit. The MAP sensor measures the pressure inside the intake manifold, which helps the engine control module (ECM) determine the correct air-fuel mixture for optimal performance. A high input signal suggests that the pressure reading is higher than expected, potentially leading to issues with fuel delivery, ignition timing, and overall engine performance.

OBDII Code P0108 Mercedes-Benz - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0108 Mercedes-Benz Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Common Causes of P0108 Mercedes-Benz

  1. Faulty MAP sensor
  2. Wiring or connector issues in the MAP sensor circuit
  3. Vacuum leaks in the intake system
  4. Faulty ECM
  5. Barometric pressure sensor malfunction

Symptoms of P0108 Mercedes-Benz

  1. Decreased fuel efficiency
  2. Rough idle
  3. Hesitation or stumbling during acceleration
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P0108 Mercedes-Benz

  1. Diagnose the issue by using a scan tool to check for the P0108 code and perform a visual inspection of the MAP sensor and related wiring.
  2. Test the MAP sensor's voltage output using a multimeter to determine if it is functioning within specifications.
  3. Inspect and repair any damaged wiring or connectors in the MAP sensor circuit.
  4. Check for vacuum leaks in the intake system and repair as necessary.
  5. If the issue persists, replace the MAP sensor or the ECM, depending on the root cause of the problem.

Cost to Fix P0108 Mercedes-Benz

The cost of repairing a P0108 code in a Mercedes-Benz can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing a faulty MAP sensor can cost between $100 to $300, including parts and labor. However, if additional diagnosis or repairs are needed, the total cost could be higher. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

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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 P0108 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0108 in a Mercedes-Benz?

- Common symptoms include poor engine performance, reduced fuel efficiency, rough idle, stalling, and the illumination of the check engine light.

2. What does the OBDII code P0108 indicate in a Mercedes-Benz?

- OBDII code P0108 indicates a high input signal from the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit.

3. What are the possible causes of OBDII code P0108 in a Mercedes-Benz?

- Possible causes include a faulty MAP sensor, BARO sensor, damaged wiring or connectors in the sensor circuit, intake manifold leaks, or a problem with the engine's computer.

4. How can I diagnose the issue related to OBDII code P0108 in my Mercedes-Benz?

- Diagnosis involves using a scan tool to read the code, checking the sensor's wiring and connectors for damage, testing the sensor's voltage output, and inspecting the intake manifold for leaks.

5. Can I still drive my Mercedes-Benz with OBDII code P0108?

- It is not recommended to drive your vehicle with OBDII code P0108, as it can lead to further damage to the engine and potentially unsafe driving conditions.

6. How can I repair OBDII code P0108 in my Mercedes-Benz?

- Repair options include replacing the faulty MAP or BARO sensor, repairing damaged wiring or connectors, fixing any intake manifold leaks, and clearing the trouble code using a scan tool.

7. Is it necessary to reset the check engine light after fixing OBDII code P0108 in a Mercedes-Benz?

- Yes, it is important to reset the check engine light using a scan tool after fixing the issue related to OBDII code P0108 to ensure proper functionality and monitor for any new problems.

8. Will OBDII code P0108 cause permanent damage to my Mercedes-Benz if left untreated?

- Ignoring OBDII code P0108 can potentially lead to reduced engine performance, decreased fuel efficiency, and other engine-related issues over time if left untreated.

9. Can a DIY enthusiast fix OBDII code P0108 in a Mercedes-Benz?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to address OBDII code P0108 by following repair guides and utilizing appropriate diagnostic equipment.

10. How can I prevent OBDII code P0108 from occurring in my Mercedes-Benz in the future?

- Regular maintenance, such as checking and replacing sensors as recommended, inspecting wiring for damage, and addressing any intake manifold issues promptly, can help prevent OBDII code P0108 from occurring.

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