P222E: Barometric Pressure Sensor B Circuit Intermittent/Erratic

P222E catches a sensor B signal that jitters. Outside air pressure changes slowly, so GM measures noise directly: every 12.5 ms the difference to the previous reading is taken, and the absolute differences over 80 consecutive readings are added up into a so-called string length. If that total exceeds 100 kPa, the one-second sample counts as failed; four failures in five samples set the code as Type B, MIL after two trips. GM uses this in the 2018 tables for the 3.0 L LGW and in a 2016 engine family. The fault differs from P222C/P222D, where the voltage sits steadily outside its limits, and from P222B, where a smooth signal shows the wrong value. Loose pins, chafed wires and electrical interference are the usual suspects.

Symptoms

• Check engine light that may come and go
• Second barometric value jumping on the scan tool

Most likely causes

• Loose or corroded terminal at sensor B or the ECM
• Chafed wire with intermittent contact
• Electrical interference, for example from a poorly grounded component nearby

What to check, in order

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

1. Check the connector and the pressure port
2. Gently move the wiring with the engine running and watch whether the reading changes.
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 P222E means

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

Frequently asked questions

Can I keep driving with code P222E?

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

What causes code P222E?

The most common causes are: loose or corroded terminal at sensor B or the ECM; chafed wire with intermittent contact; electrical interference, for example from a poorly grounded component nearby.

Related codes

• P222ABarometric Pressure Sensor B Circuit
• P222BBarometric Pressure Sensor B Circuit Range/Performance
• P222CBarometric Pressure Sensor B Circuit Low
• P222DBarometric Pressure Sensor B Circuit High
• P2230Barometric Pressure Sensor A Circuit Intermittent/Erratic

Sources

• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
• gsi.ext.gm.com: 16OBDG05 Engine Diagnostics
• law.cornell.edu: 13 CCR 1968.2

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.