P2226
Barometric Pressure Sensor A Circuit
Fuel & air metering
Generic OBD-II
Low
What it means
P2226 flags a general fault in the barometric pressure sensor circuit, which tells the ECM the local atmospheric pressure so it can correct fueling and timing for altitude. The sensor is often integrated with the MAP sensor. Because the ECM can substitute a default value, the car usually still drives normally, with only minor fueling or economy effects.
Low
Can I keep driving? Drivable — the ECM falls back to a default value. You may notice slightly off fueling or timing, especially at altitude.
Common symptoms
What you'll notice
- Check-engine light on
- Often no obvious driving symptoms
- Slight loss of power or economy, more noticeable at altitude
- Occasional hesitation or rough running
Common causes
Most likely first
- Faulty barometric pressure sensor (often built into the MAP sensor)Likely
- Open or shorted wiring in the BARO/MAP circuitCommon
- Poor connection or corrosion at the sensor connectorCommon
- Vacuum or reference-port fault feeding the sensorLess often
- Rarely, a faulty ECM/PCMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and live data; compare the BARO reading to actual atmospheric pressure for your elevation.
- Inspect the sensor connector and wiring for opens, shorts, and corrosion.
- Backprobe for the 5V reference and a good ground at the sensor.
- On combined MAP/BARO sensors, check the vacuum line and port for leaks or blockage.
- If the wiring and reference are good, replace the sensor and retest.
FAQ
Quick answers
Is it safe to drive with P2226?+
Yes. The ECM uses a substitute pressure value, so drivability is mostly normal, though fueling may be slightly off until it's fixed.
Can I just clear P2226?+
It returns until the sensor or its circuit is repaired.
Related codes
Often seen with P2226
Read & clear P2226 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