P222BBarometric Pressure Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P222B means sensor B delivers a clean signal whose value is wrong. GM documents two strategies. On the 3.0 L LGW (2018) and a 2016 engine family the ECM estimates outside pressure from boost pressure, airflow and rpm while driving; sensor B fails if it deviates by more than 20 kPa, or 25 kPa once more than 1.24 miles have passed since the last update. With the engine stopped for over 10 s, B must sit between 50 and 115 kPa, and if MAP, boost and BARO A agree within 10 kPa while B is further away, B is singled out. Both run as Type B over 320 of 400 readings. On GM's 2023-2024 twin-throttle engine, sensor B measures ahead of the bank 2 throttle and is checked against ambient pressure for 2 s.
- What you may notice
- Check engine light after two drives
- Usually no driveability change
- Likely causes
- LikelySensor B reading with offset or stuck at one value
- PossibleLeak or restriction in the intake path that distorts the comparison
- RareBoost or manifold pressure sensor fault affecting the estimate
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.