P0105: Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
P0105 means Manifold Absolute Pressure/Barometric Pressure Sensor Circuit. The manifold absolute pressure (MAP) sensor measures intake manifold pressure (vacuum), which the engine computer uses to calculate engine load. The control module has detected a fault in the circuit itself, such as an open circuit, a short, or a signal outside the electrical limits it expects.
Can I keep driving? Drivable with care. Diagnose soon: performance, economy or other components can be affected.
Common symptoms
- Check engine light on
- Rough idle or hesitation
- Poor fuel economy or black smoke
- Hard starting
- Possible failed emissions
Possible causes
- Cracked or disconnected vacuum hose to the sensor
- Failed MAP sensor
- Wiring or connector fault
- Problem with the 5 V reference circuit
- Engine mechanical problem causing low vacuum (range/performance codes)
How to diagnose P0105
- Check the vacuum hose or port to the sensor.
- With key on, engine off, the MAP reading should match barometric pressure. At warm idle it should drop considerably.
- Check the 5 V reference, ground and signal at the connector.
- For range/performance codes, verify engine vacuum with a gauge.
What the code means, digit by digit
Generic codes have the same definition on every OBD-II vehicle (petrol cars from model year 1996 in the US, 2001 in the EU; diesels later). Manufacturers can add their own enhanced codes; those are not listed here.
Related 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
- P0109 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Intermittent
General guidance only. Fault codes describe what the engine computer saw, not which part failed: confirm with testing before replacing parts, and follow the vehicle's service information.