P0105 code meaning
Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
Powertrain system Generic code P01xx codes Check engine light
What P0105 means
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 gasoline 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.
P0105 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1 hours
- Clears after repairAfter a drive cycle
Symptoms of P0105
- Check engine light on
- Loss of power, limp mode with torque limit (diesel)
- Rough idle, hard starting, higher consumption (gasoline)
- Smoke possible on diesels
Common causes of P0105
- Most 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
- Less likely5 V reference pulled down by another sensor on the same circuit
- Less likelyEngine control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Manifold absolute pressure sensorSensor wiringSensor reference voltage
What each part of P0105 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| 05 | The exact fault in that area. |
What to do next
- Note P0105 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0105
What does P0105 mean?
P0105 means "Manifold Absolute Pressure/Barometric Pressure Sensor Circuit". 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 generic code, so it means the same on every make.
Is it safe to drive with P0105?
Drive gently and only to a workshop. With P0105 the car can go into limp mode (reduced power) to protect itself.
Will P0105 fail an emissions test?
Yes, it can. P0105 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0105 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0105 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.