P0105Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The manifold absolute pressure (MAP) sensor measures the pressure behind the throttle; on vehicles without a separate barometric sensor it also supplies the ambient pressure, read at key-on or wide-open throttle – hence 'MAP/BARO'. It is a three-wire sensor with 5 V reference, ground and signal. P0105 is the general circuit fault and is rarely used today: most petrol engines report low, high and intermittent separately (P0107–P0109). It appears mainly where the fault cannot be broken down further – Ford's 2023 diesels set it when the digital SENT sensor reports a bad status or an out-of-limit value for 5 s (lost communication is a separate U code), and Bosch EDC16 diesels use it with a fault type byte, for example signal below 0.2 V. Saab then substitutes 101.3 kPa, limits torque and switches off EGR and boost control.
- What you may notice
- Check engine light on
- Loss of power, limp mode with torque limit (diesel)
- Rough idle, hard starting, higher consumption (petrol)
- Smoke possible on diesels
- Likely causes
- LikelyConnector or wiring to the sensor open, shorted or loose
- PossibleMAP sensor faulty (oiled, failed internally, SENT status fault)
- PossibleSensor hose disconnected, vacuum or boost leak
- Rare5 V reference pulled down by another sensor on the same circuit
- RareEngine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.