P0105: Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

Definition

The OBD2 code P0105 indicates a malfunction in the manifold absolute pressure (MAP) or barometric pressure sensor circuit, which can affect engine performance and fuel efficiency

Common causes

Faulty MAP sensor
Vacuum leaks
Damaged wiring or connectors
Faulty PCM (Powertrain Control Module)
Clogged or restricted intake manifold
Barometric pressure sensor issues
Corroded or loose electrical connections
Faulty intake air temperature sensor
Software issues in the engine control module

Common misdiagnoses

Faulty Mass Air Flow (MAF) Sensor
Vacuum Leaks
Throttle Position Sensor (TPS) Issues
Engine Coolant Temperature Sensor Problems
Intake Air Temperature Sensor Malfunction
Faulty Engine Control Module (ECM)
Fuel Pressure Issues
Exhaust Gas Recirculation (EGR) System Problems
Wiring or Connector Issues
Dirty or Clogged Air Filter

Troubleshooting steps

1. Check for Additional Codes

Before proceeding, check for any other related trouble codes that may provide more context to the problem
2. Inspect the MAP Sensor
3. Locate the MAP sensor and visually inspect it for any signs of damage, corrosion, or loose connections
4. Ensure that the sensor is securely mounted and that the electrical connector is clean and free of debris
5. Test the MAP Sensor
6. Use a multimeter to check the voltage output of the MAP sensor. Compare the readings to the specifications in the vehicle's service manual
7. If the voltage is outside the expected range, the sensor may be faulty and should be replaced
8. Check Wiring and Connectors
9. Inspect the wiring harness and connectors leading to the MAP sensor for any signs of wear, fraying, or damage
10. Look for any loose or corroded connections that could affect the sensor's performance
11. Check for Vacuum Leaks
12. Inspect the intake manifold and vacuum hoses for any leaks. A vacuum leak can cause incorrect readings from the MAP sensor
13. Use a smoke machine or a can of carburetor cleaner to help identify any leaks
14. Test the Barometric Pressure Sensor
15. If your vehicle has a separate BARO sensor, test it similarly to the MAP sensor. Ensure it is functioning correctly and providing accurate readings
16. Inspect the Engine Ground
17. Ensure that the engine ground connections are clean and secure. Poor grounding can lead to erratic sensor readings
18. Check the Power Supply
19. Verify that the MAP sensor is receiving the correct voltage from the vehicle's power supply. Check the vehicle's wiring diagram for the correct voltage specifications
20. Clear the Codes and Test Drive
21. After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
22. Consult a Professional
23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue causing the P0105 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the MAP Sensor

3. Locate the MAP sensor and visually inspect it for any signs of damage, corrosion, or loose connections

4. Ensure that the sensor is securely mounted and that the electrical connector is clean and free of debris

5. Test the MAP Sensor

6. Use a multimeter to check the voltage output of the MAP sensor. Compare the readings to the specifications in the vehicle's service manual

7. If the voltage is outside the expected range, the sensor may be faulty and should be replaced

8. Check Wiring and Connectors

9. Inspect the wiring harness and connectors leading to the MAP sensor for any signs of wear, fraying, or damage

10. Look for any loose or corroded connections that could affect the sensor's performance

11. Check for Vacuum Leaks

12. Inspect the intake manifold and vacuum hoses for any leaks. A vacuum leak can cause incorrect readings from the MAP sensor

13. Use a smoke machine or a can of carburetor cleaner to help identify any leaks

14. Test the Barometric Pressure Sensor

15. If your vehicle has a separate BARO sensor, test it similarly to the MAP sensor. Ensure it is functioning correctly and providing accurate readings

16. Inspect the Engine Ground

17. Ensure that the engine ground connections are clean and secure. Poor grounding can lead to erratic sensor readings

18. Check the Power Supply

19. Verify that the MAP sensor is receiving the correct voltage from the vehicle's power supply. Check the vehicle's wiring diagram for the correct voltage specifications

20. Clear the Codes and Test Drive

21. After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

22. Consult a Professional

23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue causing the P0105 code