P2228
Barometric Pressure Sensor Circuit Low
The barometric (ambient) pressure sensor reports a voltage below the valid window. The ECU uses this signal to compensate fuel and boost calculations for altitude — a stuck-low value tricks the ECU into thinking the car is at high altitude.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Barometric pressure sensor failedCommon
- Signal shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Barometric Pressure Sensor
- Bps Wiring
P2228 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.