P2229

Barometric Pressure Sensor A Circuit High

Q: Is it safe to drive with P2229?

Yes. Barometric pressure is a minor fueling and timing input used mainly for altitude compensation, so the effect on driving is small. It should still be repaired to keep the mixture accurate.

Q: Can I just clear P2229?

It clears, but a high signal returns while the wiring or sensor is faulty. Find and fix the open circuit or replace the sensor first.

Fuel & air metering Generic OBD-II Low

What it means

P2229 means the ECM sees a higher-than-expected voltage on the barometric pressure sensor "A" signal circuit — usually an open or a short to voltage in the wiring, or a failed sensor. The barometric sensor (often built into the MAP sensor) tells the ECM the ambient air pressure so it can compensate for altitude. The car drives normally, with the main effect being slightly less accurate fueling, especially at high elevation.

Low

Can I keep driving? Safe to drive — a barometric pressure signal fault mainly affects altitude compensation, so you may notice slightly reduced performance or economy, especially at high altitude.

Real-world scan data

Seen in

149

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Appears alongside · share of P2229 scans

P0113in 51.0% of scans

P0103in 47.0% of scans

P0102in 45.0% 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 noticeable driving symptom
Minor hesitation or reduced performance, most likely at altitude
Slight drop in fuel economy

Common causes

Most likely first

Faulty barometric pressure sensor (often integrated into the MAP sensor)Likely
Open circuit or short to voltage in the sensor signal wiring (high reading)Common
Poor electrical connection or corrosion at the sensor connectorCommon
Faulty ECM (least likely)Less often

How to diagnose & fix

Work through it in order

Do a careful visual inspection of the sensor and its connector for damage, corrosion, or loose pins.
With the key on and engine off, check for a steady 5-volt reference and a good ground at the sensor.
Compare the sensor's barometric reading on a scan tool to the actual pressure for your altitude — a fixed high value points to an open signal or the sensor.
Repair the wiring or replace the barometric/MAP pressure sensor, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2229?+

Yes. Barometric pressure is a minor fueling and timing input used mainly for altitude compensation, so the effect on driving is small. It should still be repaired to keep the mixture accurate.

Can I just clear P2229?+

It clears, but a high signal returns while the wiring or sensor is faulty. Find and fix the open circuit or replace the sensor first.

Read & clear P2229 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