Barometric Pressure Sensor Circuit High
The P2229 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the barometric pressure (BARO) sensor that is higher than the expected range. This sensor measures atmospheric pressure to help the ECM adjust fuel delivery and ignition timing. A high circuit condition typically means the signal voltage is stuck at a high level, often due to a short to voltage, a faulty sensor, or wiring issues.
1. Most Common Causes
- Faulty barometric pressure sensor
- Short to voltage in the sensor signal circuit
- Open or high resistance in the sensor ground circuit
- Corroded or damaged wiring/connectors
- Faulty ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor engine performance (hesitation, rough idle)
- Decreased fuel economy
- Hard starting or stalling
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, corrosion, or loose connections.
Step 3: Using a multimeter, check the sensor signal voltage (should be around 4.5-5V at sea level) and compare to manufacturer specs.
Step 4: Test the sensor ground circuit for continuity and voltage drop.
Step 5: If wiring and voltage are normal, replace the barometric pressure sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but you may experience reduced performance and fuel economy. Prolonged driving could lead to other issues.
How much does it cost to fix?▼
Typically between $50 and $150, including parts (sensor $30-$80) and labor (0.5-1 hour).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.