Guide To P2431 OBD Error Code Solutions

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If you are looking for information with regard to the P2431 error code, then you are at the right place. Keep reading further. Air is added into the exhaust by the secondary air injection system to minimize vehicle emission. The incorrect flow is identified by the engine control unit and the P2431 error code is set. The check engine light will blink on the dashboard where it finally ends up in safe mode. The vehicle will remain in failsafe mode to prevent further damages and it will remain in the same pressure until the error is fixed.

When the engine starts during cold weather conditions, minimizing the amount of hydrocarbon exhaust emissions is the ultimate aim of the secondary air injection system air flow/pressure sensor circuit bank 1. Pressurized fresh air is sent by the PCM by activating the air pump so that it accelerates the catalyst operation and lessens the harmful exhaust gas level. This procedure will make the engine to reach normal operating temperature very soon. Depending on the manufacturers’ recommendation, the sir system pressure sensor will monitor the pressure at the air control solenoid valve inlet so that the valve can be opened and closed at a fixed temperature and pressure.

What causes this problem with the Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1?

• The secondary air injection pump might be broken.
• Broken one-way check valve.
• Damaged air control solenoid valve.
• Air pressure sensor might be faulty.
• Corroded wires.
• Connectors might be rusted or faulty.
• Malfunctioning PCM.

1. Secondary Air Injection Pump - Too much of moisture can cause the secondary air injection pump to be faulty. Fix it as soon as possible
2. Air Injection Valve - Find the right replacement for a faulty air injection valve from Parts Avatar at affordable prices online.
3. Air pressure sensor - A very rough idle by the engine indicates that the air pressure sensor is faulty and it needs replacement as quickly as possible.
4. Powertrain Control Module - You will likely face performance issue in your engine if the powertrain control module is faulty. Also, the engine may fail to start and there might be sparking issues. Replace your powertrain control module if you happen to witness these symptoms in your vehicle.
5. Air Control Solenoid Valve - Irregular idle speed is one of the common symptom for a faulty air control solenoid valve. Get it replaced quickly to avoid P2431 error code.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2431 here:

Common Symptoms

• During the stop condition, the engine might idle.
• The engine might not start at all.
• The sound from the secondary air injection system.
• Engine performance seems to be weak.
• The check engine light will be well-lit.

Want to correct the Trouble Code P2431? Read these points mentioned below:

• The secondary air injection pump needs replacement.
• The broken one-way check valve needs to be altered.
• Air pressure sensor needs alteration.
• Air control solenoid valve needs replacement.
• Removing the corrosion from the connectors.
• Defective wires must be changed.
• PCM must be reprogrammed or fixed.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2431 code to be stored:

• The mechanic will attach a scan tool to the DLC port of the vehicle to check for any error codes that are stored in the engine control unit which might also include the history and other pending codes.
• Secondly, each of the codes will be carefully noted and then erased.
• Now the mechanic will test drive the vehicle by making an attempt to replicate the symptoms which are present.
• A careful visual inspection of the vehicle will be carried out by checking for any possible signs of damage or defective parts once the test drive is completed.
• In order to access the data stream of the vehicle, the scan tool will be used to check the operation of the secondary air pump. After this, the voltage will be verified at the pump with the help of a multimeter.

Common Mistakes When Diagnosing the P2431 Code

Not carrying out the diagnostic process in a logical sequence is one of the common mistakes. Easy-to-repair and simple faults can be easily missed which results in performing expensive repairs. Missing of these simple steps can result in a waste of time and money.