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P0108 Honda Code - Manifold Absolute Pressure Sensor Circuit High Voltage

Quick Answer

The P0108 diagnostic trouble code (DTC) for Honda vehicles indicates a high voltage condition in the Manifold Absolute Pressure (MAP) sensor circuit. Common causes include Faulty MAP Sensor: The MAP sensor itself may be malfunctioning, sending incorrect voltage readings to the ECM, Wiring Issues: Damaged or corroded wiring connections between the MAP sensor and ECM can cause high voltage readings, Vacuum Leaks: Any leaks in the intake manifold or vacuum lines can affect the MAP sensor's readings. 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 Honda indicates Manifold Absolute Pressure Sensor Circuit High Voltage.
Common causes
Common causes include Faulty MAP Sensor: The MAP sensor itself may be malfunctioning, sending incorrect voltage readings to the ECM, Wiring Issues: Damaged or corroded wiring connections between the MAP sensor and ECM can cause high voltage readings, Vacuum Leaks: Any leaks in the intake manifold or vacuum lines can affect the MAP sensor's readings.
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 Honda Description

The P0108 diagnostic trouble code (DTC) for Honda vehicles indicates a high voltage condition in the Manifold Absolute Pressure (MAP) sensor circuit. The MAP sensor is a crucial component in the engine management system, as it measures the intake manifold pressure, which is used by the Engine Control Module (ECM) to calculate air/fuel mixture and ignition timing. A high voltage reading from the MAP sensor can lead to incorrect fuel delivery and ignition timing, resulting in poor engine performance, reduced fuel economy, and increased emissions.

OBDII Code P0108 Honda - Manifold Absolute Pressure Sensor Circuit High Voltage
P0108 Honda Code - Manifold Absolute Pressure Sensor Circuit High Voltage

Common Causes of P0108 Honda

  1. Faulty MAP Sensor: The MAP sensor itself may be malfunctioning, sending incorrect voltage readings to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connections between the MAP sensor and ECM can cause high voltage readings.
  3. Vacuum Leaks: Any leaks in the intake manifold or vacuum lines can affect the MAP sensor's readings.
  4. ECM Malfunction: A malfunctioning ECM can also cause high voltage in the MAP sensor circuit.

Symptoms of P0108 Honda

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine Light on the dashboard.
  2. Decreased Engine Performance: The vehicle may experience a lack of power, hesitation, or rough idling due to incorrect air/fuel mixture.
  3. Poor Fuel Economy: A high voltage in the MAP sensor circuit can lead to inefficient combustion, resulting in decreased fuel efficiency.
  4. Emissions Issues: The vehicle may fail emissions tests due to improper air/fuel mixture and increased emissions.

How to Fix P0108 Honda

  1. Diagnose: Use a scan tool to confirm the P0108 code and perform a thorough inspection of the MAP sensor and its wiring.
  2. Replace MAP Sensor: If the MAP sensor is faulty, replace it with a new one following manufacturer's instructions.
  3. Check Wiring: Inspect and repair any damaged wiring connections or replace corroded connectors.
  4. Repair Vacuum Leaks: Check for and repair any vacuum leaks in the intake manifold or vacuum lines.
  5. Clear Codes: After repairing the issue, clear the DTC and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix P0108 Honda

The cost of repairing a P0108 code in a Honda vehicle can vary depending on the specific model and year. On average, the cost of replacing a MAP sensor ranges from $100 to $250, with labor costs adding an additional $80 to $150 per hour. Overall, the total repair cost can range from $150 to $400, but it's advisable to check with local auto repair shops for a more accurate estimate. Factors such as the vehicle's location, make and model, and the severity of the issue can all impact the final repair cost.

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Information for Specific Honda Models

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 Honda Code

1. What are the common symptoms of OBDII code P0108 in a Honda related to the Manifold Absolute Pressure (MAP) sensor circuit high voltage?

The common symptoms include poor engine performance, rough idling, stalling, reduced fuel efficiency, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P0108 in a Honda?

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 control module (ECM).

3. How can I diagnose the issue related to OBDII code P0108 in my Honda?

You can diagnose the issue by using an OBDII scanner to retrieve the fault code, visually inspecting the MAP sensor and its connections, checking for damaged wiring, and performing a voltage test on the sensor.

4. Can I drive my Honda with OBDII code P0108 triggered?

It is not recommended to drive your Honda with this code triggered, as it can lead to poor engine performance and potential further damage. It is best to address the issue promptly.

5. How can I repair OBDII code P0108 in my Honda?

Repair options include replacing the faulty MAP sensor, repairing or replacing damaged wiring or connectors, cleaning or replacing a clogged intake manifold, and resetting the fault code using an OBDII scanner.

6. Is it possible to reset OBDII code P0108 in my Honda without fixing the underlying issue?

Resetting the code without fixing the underlying issue may temporarily turn off the Check Engine Light, but the problem will likely reoccur. It is important to address the root cause of the code.

7. Can a DIY enthusiast fix OBDII code P0108 in a Honda?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to fix this issue by following repair guides or tutorials specific to their Honda model. However, professional help is recommended if unsure.

8. How much does it typically cost to repair OBDII code P0108 in a Honda at a mechanic or dealership?

The cost of repair can vary depending on the exact cause of the issue, but it generally ranges from $100 to $300 for parts and labor. Prices may be higher at a dealership compared to an independent mechanic.

9. Are there any preventive measures to avoid OBDII code P0108 in a Honda?

Regular maintenance, such as cleaning the intake system, inspecting the MAP sensor and its connections, and addressing any engine performance issues promptly, can help prevent the occurrence of this code.

10. How long does it usually take to repair OBDII code P0108 in a Honda?

The repair time can vary depending on the specific cause of the issue and the availability of parts. In general, it may take anywhere from 1 to 3 hours to diagnose and fix the problem related to this code.

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