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What does Error Code P0108 mean?

Moderate Issue
DTC Code P0108 indicates a Manifold Absolute Pressure/Barometric Pressure Circuit High Input, where the ECM detects the MAP sensor voltage exceeding 4.50 V for more than 13 ms, suggesting abnormal pressure readings in the intake manifold.

What are the symptoms of Error Code P0108?

  • Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating a potential issue with the manifold absolute pressure (MAP) sensor circuit.
  • Engine Rough Idle: The engine may experience a rough idle due to incorrect air-fuel mixture caused by the high input from the MAP sensor.
  • Engine Hesitation: There may be noticeable hesitation during acceleration as the engine struggles to maintain proper performance due to the MAP sensor's high input.

What causes Error Code P0108?

  • The Manifold Absolute Pressure (MAP) sensor may be malfunctioning, leading to incorrect pressure readings.
  • An open or shorted MAP sensor harness can disrupt the signal transmission, causing high input readings.
  • Poor electrical connections in the MAP sensor circuit can result in intermittent or incorrect data being sent to the ECM.
  • A faulty Engine Control Module (ECM) might misinterpret the sensor data, triggering the error code.
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How to fix Error Code P0108?

  • Verify DTC Code: Confirm the presence of DTC P0108 using an OBD-II scanner. Check for any additional codes that may be present.
  • Inspect MAP Sensor: Visually inspect the Manifold Absolute Pressure (MAP) sensor for any signs of damage, corrosion, or loose connections. Ensure the sensor is properly mounted.
  • Check Wiring and Connectors: Examine the wiring and connectors leading to the MAP sensor for any signs of wear, fraying, or disconnection. Repair or replace as necessary.
  • Test MAP Sensor Voltage: Using a multimeter, measure the voltage at the MAP sensor connector. Compare the readings to the manufacturer's specifications to ensure they are within range.
  • Inspect Vacuum Lines: Check the vacuum lines connected to the MAP sensor for any leaks, blockages, or disconnections. Repair or replace as needed.
  • Perform ECU Reset: After repairs, clear the DTC code from the ECU and perform a test drive to ensure the issue does not reoccur.
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