P0108 – OBD-II DTC

OBD-II DTC P0108 – Manifold Absolute Pressure/Barometric Pressure Circuit High Input

DTC P0108 meaning

DTC P0108 refers to a diagnostic trouble code that indicates a high input signal from the Manifold Absolute Pressure (MAP) sensor or the Barometric Pressure (BARO) sensor. This code is triggered when the Engine Control Module (ECM) detects a voltage reading from the MAP sensor that exceeds the manufacturer’s specified range. The MAP sensor measures the pressure within the intake manifold, which is crucial for determining the engine’s air-fuel mixture and overall performance.

DTC P0108 symptoms

Common symptoms associated with DTC P0108 may include:

• Check Engine Light illuminated
• Rough idling or stalling
• Decreased engine performance
• Poor fuel economy
• Increased emissions
• Difficulty starting the engine

DTC P0108 causes

Several factors can lead to the triggering of DTC P0108, including:

• Faulty MAP sensor
• Wiring issues or damaged connectors in the MAP sensor circuit
• Vacuum leaks in the intake manifold
• Faulty Barometric Pressure sensor
• ECM software issues or malfunctions
• Excessive pressure in the intake manifold due to a malfunctioning turbocharger or supercharger

DTC P0108 seriousness

DTC P0108 is considered a serious issue as it can lead to poor engine performance and increased emissions. If left unaddressed, it may result in further engine damage or failure. It is advisable to diagnose and repair the issue promptly to ensure optimal vehicle performance and compliance with emissions regulations.

How to diagnose DTC P0108

To diagnose DTC P0108, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0108 code.
2. Inspect the MAP sensor and its wiring for any visible damage or disconnections.
3. Check for vacuum leaks in the intake manifold.
4. Test the MAP sensor using a multimeter to ensure it operates within the specified voltage range.
5. Examine the Barometric Pressure sensor if applicable.
6. Review the ECM for any software updates or faults.

How to fix DTC P0108 step-by-step instructions

To fix DTC P0108, follow these step-by-step instructions:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors related to the MAP sensor.
3. Replace the MAP sensor if it is found to be faulty.
4. Fix any vacuum leaks in the intake manifold.
5. Check and replace the Barometric Pressure sensor if necessary.
6. Recheck the system for any additional codes after repairs.
7. Test drive the vehicle to ensure the issue is resolved.

How to erase DTC P0108

To erase DTC P0108, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the scanner’s menu and select the option to clear or erase trouble codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the engine to verify that the code does not reappear.

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