Barometric Pressure Sensor Circuit Range/Performance
The P222B code indicates that the Engine Control Module (ECM) has detected a signal from the barometric pressure (BARO) sensor that is outside the expected range or performance parameters. This sensor measures atmospheric pressure to help the ECM adjust fuel delivery and ignition timing. A faulty sensor, wiring issues, or a vacuum leak can cause this code.
1. Most Common Causes
- Faulty barometric pressure sensor 'B' (internal damage or wear)
- Open circuit, short to ground, or short to voltage in the sensor signal, ground, or 5V reference circuit
- Corroded, loose, or bent pins in the sensor connector causing high resistance or intermittent signal
- Excessive resistance in the wiring harness due to broken wires, chafing, or poor splices
- Rare PCM failure in the barometric sensor signal conditioning or processing circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance or hesitation
- Rough idle or stalling
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the BARO sensor and wiring for damage or corrosion.
Step 3: Test the sensor's voltage output with a multimeter (typically 4.5-5.0V at sea level).
Step 4: Compare sensor reading to known good values using a scan tool.
Step 5: Check for vacuum leaks that could affect sensor readings.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but the vehicle may experience reduced performance and fuel economy. Prolonged driving could lead to further issues.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.