P2226

Barometric Pressure Sensor A Circuit

Q: 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.

Q: Can I just clear P2226?

It returns until the sensor or its circuit is repaired.

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.

Real-world scan data

Seen in

117

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2226 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX