P222B code meaning
Barometric Pressure Sensor B Circuit Range/Performance
Powertrain system Generic code P22xx codes Check engine light
What P222B means
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.
P222B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P222B
- Check engine light after two drives
- Usually no driveability change
Common causes of P222B
- Most likelySensor B reading with offset or stuck at one value
- PossibleLeak or restriction in the intake path that distorts the comparison
- Less likelyBoost or manifold pressure sensor fault affecting the estimate
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Barometric pressure sensor
What each part of P222B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 2B | The exact fault in that area. |
What to do next
- Note P222B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P222B
What does P222B mean?
P222B means "Barometric Pressure Sensor B Circuit Range/Performance". P222B means sensor B delivers a clean signal whose value is wrong. It is a generic code, so it means the same on every make.
Is it safe to drive with P222B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P222B fail an emissions test?
Yes, it can. P222B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P222B to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P222B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.