P222B: Barometric Pressure Sensor B Circuit Range/Performance

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.

Symptoms

• Check engine light after two drives
• Usually no driveability change

Most likely causes

• Sensor B reading with offset or stuck at one value
• Leak or restriction in the intake path that distorts the comparison
• Boost or manifold pressure sensor fault affecting the estimate

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and the pressure port
2. Compare the reading with other engine data while varying the engine speed.
3. With the engine off, compare the reading with the atmospheric pressure from the barometric sensor
4. Watch how it changes when starting and accelerating
5. Clean it with a suitable product, or replace it if it does not respond

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P222B means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 2: Fuel injection
• 2B: Specific fault in that system

Frequently asked questions

Can I keep driving with code P222B?

You can drive with caution to a repair shop. Avoid demanding power if the car is in limp mode.

What causes code P222B?

The most common causes are: sensor B reading with offset or stuck at one value; leak or restriction in the intake path that distorts the comparison; boost or manifold pressure sensor fault affecting the estimate.

Related codes

• P222ABarometric Pressure Sensor B Circuit
• P222CBarometric Pressure Sensor B Circuit Low
• P222DBarometric Pressure Sensor B Circuit High
• P222EBarometric Pressure Sensor B Circuit Intermittent/Erratic
• P222FBarometric Pressure Sensor A/B Correlation
• P2227Barometric Pressure Sensor A Circuit Range/Performance

Sources

• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
• gsi.ext.gm.com: 16OBDG05 Engine Diagnostics
• gsi.ext.gm.com: 24OBDG07

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.