P0105: Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

What does P0105 mean?

The computer cannot trust the MAP/BARO pressure circuit. It uses this information to estimate engine load and fueling, so a fault can imitate an engine that is running too rich or too lean.

Generic OBD-II definition: Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction. Confirm applicability in your vehicle service information.

Common causes

• Disconnected or blocked MAP vacuum hose where fitted
• Faulty MAP/BARO sensor
• Broken reference, signal, or ground wiring

Symptoms

• Rough idle
• Rich running or hesitation
• Stalling or check engine light

Diagnostic focus

A blocked vacuum passage can make a good MAP sensor report the wrong manifold conditions. Check the pressure connection as well as the electrical connector.

Can I keep driving with P0105?

Severity: Medium Drive gently and get it diagnosed soon.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Inspect the MAP hose or pressure port
• Compare key-on engine-off pressure with local barometric pressure
• Test the sensor supply, ground, and response before replacement

Sources & review

• OBD-Codes.com: P0105
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.