Technical Description of OBD-II Trouble Code
Intermittent/Erratic Barometric Pressure Sensor A
What does that signify?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles. It may affect various vehicles including Chevy, Mazda, Volvo, Acura, Honda, BMW, Isuzu, Mercedes Benz, Cadillac, Hyundai, Saab, Ford, GMC, etc. While it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration.
Most Engine Control Modules (ECMs) rely on multiple measurements to accurately maintain the optimal air to fuel ratio for the engine. The optimal air/fuel ratio, known as the “stoichiometric” mixture, is 14.7 parts air to one part fuel. The ECM monitors various values such as air flow, coolant temperature, engine speed, load demand, atmospheric temperature, etc., to keep the fuel mixture as close to stoichiometric as possible. Some engine management systems prioritize intake and atmospheric pressures to optimize the mixture.
In some cases, fewer sensors are used in these systems to achieve similar results in terms of fuel management and efficiency. Barometric Air Pressure (BAP) sensors are typically used alongside Manifold Absolute Pressure (MAP) sensors. BAP sensors measure atmospheric pressure, which is crucial for determining fuel mixtures. The ECM compares atmospheric pressures to intake manifold pressures to accurately adjust the fuel mixture based on the driver’s needs. Altitude plays a significant role in diagnosing BAPs, and symptoms may worsen or improve depending on the location, especially if driving frequently through mountainous areas.
When a letter is included in the description of an OBD2 fault code (such as “A” in this case), it often indicates a specific aspect of the system being addressed, such as different banks, sensors, circuits, connectors, etc. In this case, it helps determine which sensor is being referred to. Multiple barometric sensors are often used to ensure accurate readings and facilitate fuel management. Additionally, it aids in identifying faults within the sensors or circuits. Consult your service manual for specific details regarding letter specifications for your particular vehicle.
P2230 is set by the ECM when it detects an electrical fault in the Barometric Pressure (BAP) “A” sensor or its circuit(s) that is inconsistent or occurs randomly during certain drive cycles.
A barometric pressure sensor:
What is the severity of this DTC?
The severity of this DTC is moderately high. It is important to address this issue promptly to ensure efficient engine operation. If a fault can directly impact critical values like air/fuel ratios and is actively present, it is advisable not to operate the vehicle to prevent potential engine damage. However, if you have driven the vehicle since the fault occurred, there may not be immediate cause for concern. Nevertheless, if left unattended, this fault could lead to expensive internal engine damage in the future.
What are some of the symptoms of the code?
Symptoms of a P2230 trouble code may include:
What are some of the common causes of the code?
Causes for this P2230 code may include:
What are some P2230 troubleshooting steps?
Basic Step #1
Locate the Barometric Air Pressure (BAP) sensor on your specific vehicle. The sensor’s location can vary significantly, so it is crucial to find the correct sensor. Once located, inspect the BAP sensor for any physical damage. Consider the sensor’s surroundings, such as high heat areas, engine vibrations, exposure to elements/road debris, etc.
Basic Step #2
Ensure that the connector on the sensor is properly seated to establish a good electrical connection. If the sensor is located on the engine, vibrations may cause connections to loosen or become physically damaged.
NOTE: Remember to disconnect the battery before disconnecting any sensors to avoid causing damaging electrical spikes. If you are uncomfortable or have limited electrical knowledge, it is recommended to have your vehicle towed/driven to a reputable repair facility.
Basic Step #3
Check for any obstructions that may be affecting the sensor. Obstructions can lead to false atmospheric pressure readings, which are crucial for optimal engine performance in fuel management systems.
Basic Step #4
Using a multimeter and referring to the desired electrical values for the barometric air pressure sensor, disconnect the connector from the sensor to access the pins. Follow manufacturer-specific diagnostic procedures with the desired values and compare them. Any values outside the specified range indicate a defective sensor. Replace the sensor following proper removal and installation procedures.
