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Air intakeSeverity Medium: diagnose soon

P0105Manifold Absolute Pressure/Barometric Pressure Circuit

What it means

The ECU has detected an electrical fault in the MAP sensor circuit: the signal is missing, stuck or outside the range the sensor can produce. The MAP sensor measures the pressure (vacuum or boost) in the intake manifold.

Symptoms

  • Rough idle or hesitation
  • Poor fuel economy or black smoke
  • Limp mode on turbo engines

Common causes

  • Open or shorted signal, 5 V reference or ground wire
  • Corroded, loose or water-filled connector
  • Failed MAP sensor
  • Fault on the shared 5 V reference (another sensor pulling it down)

What to check first

  1. With the key on, measure the 5 V reference and the ground at the sensor connector
  2. Back-probe the signal and compare it with live data while wiggling the harness
  3. Check for other codes on the same 5 V reference (e.g. P0641, P0651)
Can I drive with P0105? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind P0105

MAP and boost pressure sensorWiring, typical values, multimeter and scope tests

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P0105: questions and answers

What does P0105 mean?

P0105: Manifold Absolute Pressure/Barometric Pressure Circuit. The ECU has detected an electrical fault in the MAP sensor circuit: the signal is missing, stuck or outside the range the sensor can produce. The MAP sensor measures the pressure (vacuum or boost) in the intake manifold.

What are the symptoms of P0105?

Rough idle or hesitation. Poor fuel economy or black smoke. Limp mode on turbo engines.

What causes P0105?

Open or shorted signal, 5 V reference or ground wire. Corroded, loose or water-filled connector. Failed MAP sensor. Fault on the shared 5 V reference (another sensor pulling it down).

How do you diagnose P0105?

1. With the key on, measure the 5 V reference and the ground at the sensor connector 2. Back-probe the signal and compare it with live data while wiggling the harness 3. Check for other codes on the same 5 V reference (e.g. P0641, P0651)

Can I drive with P0105?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.