P0108 Mercedes-Benz Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Quick Answer
The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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
- P0108 Mercedes-Benz indicates Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
- Common causes
- Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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.
Code P0108 Mercedes-Benz Description
The MAP sensor wiring includes 3 circuits. The Engine Control Module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAP Sensor voltage is more than 4.50 V for greater than 13 ms.
What are the Possible Causes of the DTC P0108 Mercedes-Benz?
- Faulty Manifold Absolute Pressure (MAP) Sensor
- Manifold Absolute Pressure Sensor harness is open or shorted
- Manifold Absolute Pressure Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0108 Mercedes-Benz?
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 P0108 Mercedes-Benz 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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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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