P2228

Barometric Pressure Sensor A Circuit Low

Q: Is it safe to drive with P2228?

Generally yes. The ECM uses a substitute barometric value, so the car runs, but fueling accuracy suffers, so repair it before it affects economy or emissions.

Q: Can I just clear P2228?

It returns until the sensor or its low-reading circuit is repaired, since the ECM continuously checks the barometric signal.

Fuel & air metering (barometric pressure) Generic OBD-II Medium

What it means

P2228 means the barometric pressure sensor signal is reading abnormally low — the circuit voltage is below the expected range. This sensor (often built into the MAP sensor) tells the ECM the local atmospheric pressure so it can trim fueling for altitude. The car usually still runs on a default value, but performance and economy can suffer until the sensor or wiring is fixed.

Medium

Can I keep driving? Usually drivable — the ECM falls back to a default reading, though you may notice slightly rough running or reduced performance, especially at altitude or under load.

Real-world scan data

Seen in

237

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2228 scans

P0113in 62.5% of scans

P0102in 43.0% of scans

P0118in 28.7% of scans

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
Slightly rough running or hesitation
Reduced performance or economy, especially at altitude

Common causes

Most likely first

Faulty barometric/MAP pressure sensor reading lowLikely
Short-to-ground or open in the sensor signal wiringCommon
Poor or corroded connection at the sensorCommon
Faulty ECM/PCMLess often

How to diagnose & fix

Work through it in order

Read freeze-frame and view the barometric pressure value; a stuck-low reading confirms the fault.
Do a careful visual inspection of the sensor and its connector for corrosion or damage.
Check the signal wire for a short to ground and confirm the 5-volt reference and ground are present.
Compare the barometric reading against known atmospheric pressure for your altitude.
If reference, ground, and wiring are good, replace the barometric/MAP pressure sensor and retest.

FAQ

Quick answers

Is it safe to drive with P2228?+

Generally yes. The ECM uses a substitute barometric value, so the car runs, but fueling accuracy suffers, so repair it before it affects economy or emissions.

Can I just clear P2228?+

It returns until the sensor or its low-reading circuit is repaired, since the ECM continuously checks the barometric signal.

Read & clear P2228 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