P222B Barometric Pressure Sensor B: Range / Performance

P222B Barometric Pressure Sensor B: Range / Performance

OBD-II DTC Datasheet

Barometric Pressure Transmitter B: Range / Performance

What does this mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. Affected vehicles may include, but are not limited to, Chevy, Mazda, Volvo, Acura, Honda, BMW, Isuzu, Mercedes Benz, Cadillac, Hyundai, Saab, Ford, GMC, etc. depending on the year. , make, model and equipment of the power unit.

Most engine control units (ECMs) rely on a different number of measurements to accurately provide the engine with the optimum air-fuel ratio. The “optimal” air / fuel ratio is called the “stoichiometric” mixture: 14.7 parts air to one part fuel. Some of the values ​​that the ECM controls to keep the fuel mixture as stoichiometric as possible are, but are not limited to: air flow, coolant temperature, engine speed, load demand, atmospheric temperature, etc. Some engine management systems rely more on intake and ambient air. pressure to optimize the mixture.

Not to mention, these systems use fewer sensors to achieve similar results as far as fuel management/efficiency goes anyway. Typically BAP (barometric air pressure) sensors are used when MAP (manifold absolute pressure) sensors are also present. BAPs are used to measure atmospheric pressure. This value is essential for determining fuel blends, as the ECM needs to compare atmospheric pressure with intake manifold pressure in order to accurately adjust the fuel blend to the driver's driving needs. Height is an important factor to consider when diagnosing BAP. Depending on your location, your symptoms may actively worsen or improve, especially if you travel frequently in mountainous areas.

When a letter is included in the description of an OBD2 DTC (in this case "B"), in most cases it will indicate something specific (for example, various banks, sensors, circuits, connectors, etc.) in a system in which You are at. working inside. In this case, I would say to determine which sensor you are working with. There will often be multiple barometric sensors to provide accurate readings. In addition, the correlation between the sensors to aid in fuel management, not to mention that it helps to find faults in the sensors or circuits. With all of the above, refer to your service manual for specific letter specifications for your specific vehicle.

A P222B is set by the ECM when it detects that the barometric pressure (BAP) sensor “B” or its circuit (s) are operating but not within electrical ranges, or are operating abnormally or ineffectively.

Barometric pressure sensor:

What is the severity of this DTC?

The severity here will be moderately high. While reading this, there must be some urgency to keep the engine running efficiently. Whenever a malfunction can directly affect very important values ​​such as air / fuel ratio and is actively present, you should not drive your car to prevent engine damage. That being said, if you've driven the vehicle after the fault was active, don't worry too much, you're probably fine. The big takeaway is that if left unattended, it could lead to costly internal engine damage in the future.

What are some of the symptoms of the code?

Symptoms of a P222B trouble code may include:

• Insufficient engine power and performance (or limited)
• Engine misfire
• Abnormal engine noise
• Fuel smell
• Decreased fuel economy
• Reduced throttle sensitivity

What are some of the common causes for the code?

Reasons for this P222B code may include:

• Defective or damaged BAP (atmospheric pressure) sensor
• Defective or damaged electrical connector
• Wiring problem (e.g. open circuit, short circuit, corrosion)
• Short circuit (internal or mechanical)
• Weak electrical connection
• Thermal damage
• Mechanical failure causing BAP reading to change
• ECM (Engine Control Module) problem

What are some steps to troubleshoot the P222B?

Basic step # 1

Find the BAP (Barometric Air Pressure) sensor on your specific vehicle. In my experience, the locations of these sensors vary considerably, so choosing the correct sensor should be of utmost importance. Once located, inspect the BAP sensor for any physical damage. Potential problems may vary by location, so take into account the sensor environment (eg high temperature areas, engine vibrations, elements / road debris, etc.).

Basic step # 2

Make sure the connector on the sensor itself is seated correctly to ensure a good electrical connection. If the sensor is located on the engine, it can be subject to vibrations, which can cause loose connections or physical damage.

NOTE. Remember to disconnect the battery before disconnecting any sensors. Depending on the vehicle / system / sensor, you could cause damage to electrical surges if you forget this step. However, if you feel uncomfortable here or have limited fundamental knowledge of electrical engineering, I would recommend that you tow / take your vehicle to a reputed repair shop.

Basic step # 3

Is there anything interfering with the sensor? This could be the cause of false barometric pressure readings. Accurate readings are integral to optimal engine performance in these fuel management systems.

Basic step # 4

Using a multimeter and armed with the required electrical values ​​for the barometric air pressure sensor. You will need to disconnect the connector from the sensor itself in order to access the pins. Once you see the pins, follow the manufacturer's instructions for diagnosing with the desired values ​​and compare them. Anything outside the specified range will indicate a faulty sensor. Replace it following proper re-repair procedures.

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