Barometric Pressure Sensor Circuit Low
The P2228 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the barometric pressure (BARO) sensor circuit. This sensor measures atmospheric pressure to help the ECM adjust fuel delivery and ignition timing. A low circuit condition can be caused by a faulty sensor, wiring issues, or a short to ground. This can lead to incorrect air-fuel mixture, affecting engine performance and emissions.
1. Most Common Causes
- Faulty barometric pressure sensor
- Short to ground in sensor circuit
- Open or damaged wiring/connectors
- Corroded or loose electrical connections
- Failed ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance or hesitation
- Rough idle or stalling
- Decreased fuel economy
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2228 and check for other codes.
Step 2: Visually inspect the BARO sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage reference and ground at the connector using a multimeter.
Step 4: Compare sensor output voltage to expected values (typically 4.5-5V at sea level).
Step 5: If sensor is faulty, replace it; if wiring issue, repair as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the incorrect air-fuel mixture can cause poor performance, stalling, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts (sensor $30-$80) and labor ($20-$70).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.