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P code powertrain Medium severity

P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

The OBD2 code P0107 indicates that the Manifold Absolute Pressure (MAP) or Barometric Pressure sensor is sending a low voltage signal to the engine control module, suggesting a potential issue with the sensor or its...

Definition

The OBD2 code P0107 indicates that the Manifold Absolute Pressure (MAP) or Barometric Pressure sensor is sending a low voltage signal to the engine control module, suggesting a potential issue with the sensor or its circuit

Common causes

  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Damaged wiring or connectors in the MAP sensor circuit
  • Vacuum leaks in the intake system
  • Faulty engine control module (ECM)
  • Clogged or restricted intake manifold
  • Low engine vacuum
  • Corroded or loose electrical connections
  • Faulty barometric pressure sensor (if applicable)

Common misdiagnoses

  • Faulty MAP sensor
  • Vacuum leaks
  • Throttle position sensor issues
  • EGR valve problems
  • Wiring or connector issues
  • Engine control module (ECM) failure
  • Intake air temperature sensor faults
  • Fuel pressure problems
  • Mass air flow sensor issues
  • Exhaust leaks

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can help identify if there are related issues

  2. 2. Inspect the MAP Sensor

    Visual Inspection: Check the MAP sensor for any physical damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors for fraying, breaks, or poor connections

  4. 4. Test the MAP Sensor

    Voltage Test: Use a multimeter to check the voltage output of the MAP sensor. Compare the readings to the manufacturer's specifications

  5. 5. Vacuum Test

    If applicable, apply vacuum to the MAP sensor and observe if the voltage changes accordingly

  6. 6. Check the Barometric Pressure Sensor

    If your vehicle has a separate barometric pressure sensor, perform similar checks as with the MAP sensor

  7. 7. Inspect the Vacuum Lines

    Check for any leaks or blockages in the vacuum lines connected to the MAP sensor. A vacuum leak can cause incorrect readings

  8. 8. Check for Intake Leaks

    Inspect the intake manifold and associated gaskets for leaks that could affect pressure readings

  9. 9. Examine the Engine Ground

    Ensure that the engine ground is secure and free of corrosion. A poor ground can lead to erratic sensor readings

  10. 10. Check the ECM

    If all other components are functioning correctly, the issue may lie with the Engine Control Module itself. Check for software updates or faults in the ECM

  11. 11. Clear the Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  12. 12. Consult Repair Manual

    Refer to the vehicle’s service manual for specific testing procedures and specifications related to the MAP and barometric pressure sensors.1

  13. 13. Seek Professional Help

    If you are unable to diagnose or fix the issue, consider seeking help from a qualified mechanic or automotive technician. By following these steps, you should be able to identify the cause of the P0107 code and take appropriate action to resolve it