P0105
Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
Fuel & air metering
Generic OBD-II
High
What it means
P0105 means the ECM has detected a fault in the manifold absolute pressure (MAP) sensor circuit. The MAP sensor measures intake manifold pressure so the ECM can gauge engine load and meter fuel and timing. A faulty signal can make the engine run rough, lose power, use more fuel, and in some cases stall or start hard.
High
Can I keep driving? Usually drivable but expect poor running — a bad MAP signal can cause rough idle, hesitation, stalling, or hard starting, so repair soon.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle, hesitation, or surging
- Reduced power and poor acceleration
- Poor fuel economy
- Possible stalling or hard starting
Common causes
Most likely first
- Faulty MAP/BARO sensorLikely
- Damaged or corroded wiring or connector in the sensor circuitCommon
- Vacuum leak or blocked/cracked MAP vacuum port or hoseCommon
- Less commonly, an ECM/PCM faultLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data, then check the live MAP value at key-on (it should read close to barometric pressure).
- Inspect the sensor's vacuum source and hose for leaks or blockage.
- Check the sensor wiring and connector for damage or corrosion.
- Compare the MAP reading against actual manifold pressure under load.
- Replace the MAP/BARO sensor if it reads inaccurately, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P0105?+
You can usually drive short distances, but the engine may run poorly and could stall or be hard to start. Repair it soon to avoid being stranded.
Can I just clear P0105?+
It will come back until the sensor, wiring, or vacuum leak is fixed. The MAP signal is central to fueling, so address the cause.
Related codes
Often seen with P0105
Read & clear P0105 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX