P0108 Subaru 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 Subaru 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 Subaru 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 Subaru?
- 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 Subaru?
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 Subaru 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 Subaru Code
1. What are the common symptoms of OBDII code P0108 in a Subaru?
- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, stalling, and potential issues with acceleration.
2. What does the OBDII code P0108 in a Subaru indicate?
- The 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 Subaru?
- Possible causes include a faulty MAP sensor, damaged wiring or connectors in the sensor circuit, a clogged or leaking intake manifold, or a problem with the engine's computer.
4. How can I diagnose the OBDII code P0108 in my Subaru?
- Diagnosis involves using an OBDII scanner to read the code, checking the sensor's voltage output, inspecting the sensor and its wiring for damage, and testing the intake manifold for leaks or blockages.
5. Can I drive my Subaru with the OBDII code P0108 present?
- It is not recommended to drive your Subaru with the code P0108 present, as it can lead to poor engine performance and potential damage over time. It is best to address the issue promptly.
6. How can I repair the OBDII code P0108 in my Subaru?
- Repair options include replacing the faulty MAP sensor, repairing damaged wiring or connectors, cleaning or replacing the intake manifold, or resetting the engine computer after fixing the issue.
7. Is it safe to reset the OBDII code P0108 in my Subaru without addressing the underlying problem?
- It is not recommended to simply reset the code without addressing the underlying issue, as the problem will likely resurface, leading to potential engine performance issues and decreased fuel efficiency.
8. Can a DIY enthusiast fix the OBDII code P0108 in a Subaru?
- Depending on the DIYer's skill level and access to tools, repairing the code P0108 may be feasible by following repair guides and using proper diagnostic equipment.
9. Will the OBDII code P0108 cause my Subaru to fail an emissions test?
- Yes, the code P0108 can cause your Subaru to fail an emissions test, as it indicates a problem with the vehicle's emissions control system that needs to be addressed for proper functioning.
10. How much does it typically cost to repair the OBDII code P0108 in a Subaru?
- The cost of repairing the code P0108 can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor.
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