P2227
Barometric Pressure Sensor A Circuit Range/Performance
Fuel & air metering
Generic OBD-II
Low
What it means
P2227 means the barometric pressure sensor's reading is out of its expected range or not tracking real atmospheric pressure. The PCM uses barometric pressure to adjust fuel and timing for altitude, so a bad reading can cause mild hesitation or slightly off fueling. On many vehicles the baro value is read from the MAP sensor, so that sensor, its wiring, or a plugged port are the common causes.
Low
Can I keep driving? Generally safe to drive — you may notice mild hesitation or altitude-related running issues; fix it to keep fueling and emissions correct.
Common symptoms
What you'll notice
- Check-engine light on
- Mild hesitation or rough running, especially with altitude changes
- Slightly reduced fuel economy
- Often no strongly noticeable symptom
Common causes
Most likely first
- Faulty barometric/MAP pressure sensor (baro is often read from the MAP sensor)Likely
- Sensor reading drifted out of its expected range vs. actual conditionsCommon
- Sensor harness open or shortedCommon
- Poor connection or corrosion at the sensor connectorLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare the baro reading to known atmospheric pressure for your altitude.
- Do a careful visual inspection of the sensor and its connector for damage or corrosion.
- Check the sensor's reference, ground, and signal circuits against spec.
- Clear any vacuum-port blockage if the sensor shares the MAP port.
- If the reading stays out of range with good wiring, replace the pressure sensor and re-test.
FAQ
Quick answers
Is it safe to drive with P2227?+
Usually yes — the effect is mostly minor fueling and drivability at altitude, but it should still be corrected for proper economy and emissions.
Can I just clear P2227?+
It clears, but returns if the sensor reading is still out of range; the sensor or wiring has to be addressed.
Related codes
Often seen with P2227
Read & clear P2227 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