P2438 OBD Error Code: Problem & Solutions

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Is the air control solenoid valve faulty? Then there is a high chance that the P2438 error is stored in your vehicle. This error code usually indicates a difference in the input voltage reading to the PCM which is higher than 10 percent. Sometimes, a vehicle will face this situation for several cycles for the illumination of the check engine light to take place, though the error might get stored during initial faults.

This is generally known as the secondary air injection system air flow/pressure sensor circuit high bank 2. When the engine starts during cold condition, the outside fresh air is pumped into the exhaust system by the secondary air injection system pump which in turn helps to burn the high exhaust emission which is formed during engine warm up. The design of the AIR system is carefully monitored by the PCM with the help of an AIR pressure sensor. If an erratic signal is sent by the AIR pressure sensor, the P2438 error will be stored, wherein few vehicles, the pressure sensor is a part of the AIR control solenoid.

What causes this problem with the Secondary Air Injection System Air Flow/Pressure Sensor Circuit High Bank 2?

• The secondary air injection pump might be faulty.
• One-way check valve might be malfunctioning.
• Failure of the air control solenoid valve.
• Malfunctioning of the air pressure sensor.
• The wires might be broken.
• Eroded or separated connectors.
• PCM might turn out to be defective.

1. Powertrain control module - The PCM can be faulty if the performance of the engine is very poor. Get the right replacement for your faulty PCM from PartsAvatar.
2. Engine control module - Erratic engine behavior shows that the ECM is damaged or defective. Fix it as soon as possible or replace it with a new ECM.
3. Engine wiring connectors - The engine wiring connectors play an important role in connecting various components. Is the engine wiring connector broken? Get the replacement for a faulty engine wiring connectors at an affordable price from PartsAvatar.
4. Secondary air injection pump - Blockages or presence of debris can cause the breakage of secondary air injection pump. Avoid failure by fixing it instantly.
5. Air pressure sensor - Presence of debris can cause the air pressure sensor to be faulty. Replace it as soon as possible to avoid the P2438 error code.

Next important thing you need to know about are the common symptoms for this OBD error code P2438 with your fuel volume control.

Common Symptoms

• You might find the engine stalling during idle condition.
• The hesitation of the engine to start.
• The secondary air injection system will create an unwanted blast.
• Engine performance might be weak.
• The check engine light might be illuminated.

Wish to correct this error code with your vehicle? Do you know what all you should do to make your car free from this code? Well, don’t worry! We are here to guide you.

• The secondary air injection pump needs alteration.
• The one-way check valve which might be faulty needs to be changed.
• Substituting the faulty air pressure sensor.
• Fixing the air control solenoid valve.
• The rusty connectors have to be cleaned.
• Damaged wires need replacement.
• Faulty PCM has to be fixed.

If you need any parts to fix this problem you can easily find them with us. Not only that we also have in stock the best in range auto parts and that too at the most budget-friendly prices ever online. Whether you need a powertrain control module, secondary air injection pump, air pressure sensor, air flow/pressure sensor you can simply rely on us for quality auto parts.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

1. Visually inspect the air inlet hose check valve.
2. Replacement of the check valve has to be done if the air flows through both the direction through the valve as it can be faulty.
3. Every wire, connector and other components of the secondary air injection pump have to be visually inspected by the mechanic.
4. Once the wires, connectors, and components are repaired or changed, the mechanic has to retest the complete system to make sure that everything is working in a logical manner.
5. Once the P2438 error code is cleared, the mechanic has to check if the error code keeps showing up by test driving the vehicle.

Common Mistakes When Diagnosing the P2438 Code

It is always best that the mechanic checks the one-way valve within the air inlet hose to ensure that the problem does not persist. Else, replacing the pump can further result in failure of the pump as the moisture will get build up in the pump by the check valve which results in failure if the moisture freezes during cold times.