What is OBD-II Code P222B – Barometric Pressure Sensor B Circuit Range/Performance

What is OBD-II Code P222B – Barometric Pressure Sensor B Circuit Range/Performance

OBD-II or On-board Diagnostics II is an electronic system available in most of today’s vehicles, which monitors the engines’ performance and detects any malfunctions in real-time. The OBD-II system receives feedback from various sensors present in the vehicle and provides an error code whenever a malfunction is detected. An error code is a standardized code that pinpoints the area of concern and provides the technician with enough information to repair the issue.

Code P222B is an OBD-II DTC (Diagnostic Trouble Code) that refers to the Barometric Pressure Sensor B Circuit Range/Performance. This code indicates that there is an issue with the barometric pressure sensor’s circuit or the sensor itself.

Barometric Pressure Sensor

The Barometric Pressure Sensor is an essential part of the vehicle’s engine management system. The sensor measures the atmospheric pressure around the vehicle and sends a signal to the engine control module (ECM). The ECM then uses this data to adjust the fuel injection, ignition timing, and other engine parameters. The barometric pressure sensor’s readings are also used to calculate the engine load and determine the appropriate air/fuel ratio required for optimal engine performance.

When there is a range/performance issue with the barometric pressure sensor B circuit, the ECM is not able to receive accurate atmospheric pressure data, leading to various performance issues with the vehicle.

Symptoms of P222B Code

When the P222B code is stored in the OBD-II system, the ‘Check Engine’ light appears on the dashboard. The symptoms of this code can lead to a reduction in engine power, decreased fuel efficiency, and rough engine idle. Some of the common symptoms of the P222B code are:

– Illuminated Check Engine Light.
– Rough engine idle.
– Engine power loss.
– Decreased fuel efficiency.

Causes of P222B Code

There can be several reasons for the P222B code to appear in the OBD-II system. Some of the common causes of the P222B code are:

– Faulty barometric pressure sensor.
– Damaged wiring or connections in the barometric pressure sensor’s circuit.
– The sensor is not receiving proper volts, which can affect its performance.
– The barometric pressure sensor’s readings are not in sync with the other sensors in the vehicle.

Diagnosing and Repairing P222B Code

To diagnose the P222B code, a mechanic would need an OBD-II scanner that can read the error code and provide accurate diagnostic data. Once the error code is read, the technician can perform a visual inspection of the barometric pressure sensor and the circuit’s wiring and connections.

If there are no visible issues, the mechanic can use a digital multimeter to check the barometric pressure sensor’s voltage. The voltage readings should match the specifications provided by the vehicle’s manufacturer. If the voltage levels are not correct, it may indicate a damaged sensor or faulty wiring.

If the barometric pressure sensor is found to be faulty, it needs to be replaced. Replacing the sensor is a straightforward process and can be done by disconnecting the electrical connector and removing the old sensor from its location. The new sensor can then be installed and connected to the wiring and electrical connector.

If the circuit is found to be damaged or has a loose connection, it needs to be repaired or replaced. The damaged wiring can be spliced and reconnected, or the entire circuit can be replaced depending upon the extent of the damage.

Preventing P222B Code

Performing regular maintenance on your vehicle is the best way to prevent the P222B code from appearing. Keeping up with oil changes, air filter replacements, and other routine maintenance services can help prevent any sensor issues from occurring. Additionally, treating your vehicle with care and avoiding sudden accelerations, hard turns, and abrupt stops can reduce the wear and tear on the sensor and prevent any damage or malfunction.


Q: What causes the P222B code to appear?
A: The P222B code appears when there is a range/performance issue with the barometric pressure sensor B circuit or the sensor itself.

Q: What are the symptoms of the P222B code?
A: The symptoms of the P222B code include rough engine idle, engine power loss, reduced fuel efficiency, and illuminated check engine light.

Q: How is the P222B code diagnosed and repaired?
A: The mechanic uses an OBD-II scanner and performs a visual and electrical inspection of the barometric pressure sensor circuit. If there is a fault in the circuit or sensor, then it is replaced or repaired.

Q: Can I still drive my vehicle with the P222B code?
A: It is generally safe to drive your vehicle when the P222B code appears. However, it is advisable to get the vehicle diagnosed and repaired as soon as possible to avoid further damage to the engine.

Q: How can I prevent the P222B code from appearing?
A: Perform regular maintenance and inspect the vehicle’s engine components routinely to prevent damage and malfunctioning sensors. Additionally, avoid sudden accelerations and hard turns.

In Conclusion

The P222B code can be a minor issue if diagnosed and repaired in time, but it can lead to significant engine damage if ignored. Therefore, it is always advisable to take prompt action when the ‘Check Engine’ light appears. With timely maintenance and careful handling, vehicle owners can avoid the P222B code and other OBD-II error codes from appearing in the future.

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