Diagnostic Trouble Code P0105

P0105 “Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction”


What is code P0105?

Code P0105 stands for “Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction”. This diagnostic trouble code can happen for a number of reasons related to the manifold absolute pressure (MAP) sensor on your engine. Therefore, it is important to have a qualified technician diagnose the specific problem that caused the code to be stored in your vehicle’s computer.

Get this checked out soon by a CarAdvise shop, where the work will be guaranteed, and one of our expert techs will review any repair orders.

What does code P0105 mean?

Code P0105 relates to an electrical problem with the MAP circuit on your engine, an important part of the air and fuel intake.

Your engine requires that a specific mixture or ratio of air and fuel enter the combustion chambers in order for combustion to happen as it should. When that ratio is out of balance, with too much air (too “lean”) or too much fuel (too “rich”), vehicle emissions increase and engine performance and fuel economy decrease. Even internal engine damage can occur.

For this reason, vehicle manufacturers include several sensors in the engine to monitor performance properties. The MAP sensor measures the rise and fall of pressure inside the intake manifold. It is mounted in or next to the throttle body. When your engine is running, the MAP sensor detects the level of pressure and sends the data by way of electric current to the ECM (engine control module). This data helps the ECM to determine how much fuel needs to be injected, when to fire the spark plugs, how much the EGR valve should open, and more.

If the ECM detects an issue with the electric signal coming from the MAP sensor, it will store a code P0105 and turn on the check engine light.


What causes code P0105?

A number of causes can trigger a code P0105. That is why an accurate diagnosis is essential. Causes of this code include:

Most likely

  • Vacuum leak or other leak in the air intake system
  • Faulty MAP sensor ($100-$275)
  • Inconsistent airflow from the engine air cleaner ($18-$52)

Other possibilities

  • Faulty wiring or electrical connection
  • Improper routing of the wires too close to high voltage components
  • Related engine problem leading to faulty MAP sensor readings


What symptoms are associated with this code?

Common signs associated with a code P0105 include the following:


How does a technician diagnose code P0105?

If a diagnostic scan of your vehicle indicates a code P0105, a technician will perform tests to pinpoint the problem. These tests include checking for any related trouble codes. The technician will also use the scan tool to read the live data of the mass air flow sensor across a variety of operating conditions. The mass air flow sensor, engine air cleaner, and vacuum hoses are also checked for signs of an air leak. The technician might also perform tests on the sensor itself with a multimeter and verify that sufficient voltage is reaching the device while in operation. If necessary, the technician might perform further inspection of the ECM to verify proper operation.


How serious is this code?

A code P0105 will often lead to a poor running engine. Whether or not it causes immediate drivability issues, the condition should be diagnosed and repaired as soon as possible. A problem with the MAP sensor can lead to issues beyond a rough running engine. Other problems include difficulty starting, stalling, and internal engine damage. For these reasons, a vehicle should not be driven for long with a check engine light on without scheduling an appointment for an accurate diagnosis.

Get this checked out soon by a CarAdvise shop, where the work will be guaranteed, and one of our expert techs will review any repair orders.


Related Diagnostic Trouble Codes

P0106 “Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/Performance”

P0107 “Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low”

P0108 “Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High”

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