P2229 — Barometric Pressure Circuit High
Moderate severityWhat it means
P2229 is stored when the engine control unit sees a fault involving the barometric (atmospheric) pressure sensor. The barometric pressure sensor lets the control unit adjust fuelling and timing for altitude and weather; a fault skews those corrections. A “high” reading means the signal is pinned near the top of its range — often an open circuit, a lost ground, or a short to voltage.
Common symptoms
- The live reading sits abnormally high or maxed out
- Hesitation or poor performance, especially at altitude
- Hard starting
- Higher fuel consumption
Likely causes
- Open signal or ground wire
- Signal wire shorted to a voltage supply
- A faulty barometric/MAP pressure sensor
- A wiring or connector fault
What to check first
- Check for an open circuit or missing ground at the sensor connector
- At key-on the sensor should read local atmospheric pressure
- Inspect the sensor connector and wiring
Can you keep driving?
Usually drivable, but fuelling and timing suffer; diagnose before long trips or mountain driving.
Frequently asked questions
What is the most common cause of P2229?
The most likely cause is: Open signal or ground wire. Several other faults can set P2229 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P2229 and keep driving?
Clearing P2229 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P2229?
P2229 is a moderate-severity code. The car is often still drivable, but have it diagnosed soon — the underlying problem can get worse and it may fail an emissions test.
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