Guide To P2439 OBD Error Code Solutions

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The P2439 error code might get stored in the vehicle if the electrical wires or connectors are defective. The PCM failure is commonly known as the secondary air injection system air flow/pressure sensor circuit intermittent/erratic bank 2. Outside fresh air is pumped into the exhaust system by the secondary air injection system during cold engine startup. This air helps to burn the exhaust emissions which is formed as the engine warms up. AIR pressure sensor is utilized by the PCM to look at the functionality of the AIR system. The P2439 error will get stored if an irregular signal is sent by the AIR pressure sensor. You can find the pressure sensor as a part of the AIR control solenoid in a few vehicles.

To decrease the amount of hydrocarbon exhaust emissions is the sole purpose of the secondary air injection system air flow/pressure sensor circuit bank 2 as the engine starts during cold weather situations. The air pump is initiated to send pressurized fresh air by the PCM to hasten the catalyst operation minimizing the level of dangerous exhaust gas. This step also helps the engine to reach the original operating temperature faster. At the position of the air control solenoid valve inlet, the air system pressure sensor monitors the pressure so that the valve can be opened or closed at fixed temperature and pressure based on the recommendation of the manufacturer. If the PCM finds a voltage or resistance which is erratic within the secondary air injection system air flow/pressure sensor circuit bank 2, the check engine light will be lit and the P2439 error will be stored.

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

• Damaged secondary air injection pump.
• One-way check valve might be broken.
• The air control solenoid valve might be defective.
• Broken air pressure sensor.
• Wires might be faulty.
• Separated or faulty connectors.
• PCM might be a malfunction.

1. Powertrain control module - Performance issue may rise in your vehicle if the PCM is defective. Replace the defective PCM by shopping a new one from PartsAvatar.
2. Secondary air injection pump - Presence of more moisture will result in the seizure of the secondary air injection pump. Avoid the P2439 error by fixing the faulty secondary air injection pump quickly.
3. Air control solenoid valve - If your vehicle finds it very hard to start, then the air control solenoid valve can be damaged. Quickly fix or replace them.
4. Air pressure sensor - Does your engine fail to start during acceleration? Then the air pressure sensor can be faulty. Get it fixed as soon as possible.

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on a few common symptoms of OBD error code P2439

Common Symptoms

• The engine might stay the same during the stop condition.
• Starting problem by the engine.
• The secondary air injection system might make some sound.
• Reduced engine performance.
• You might find the check engine light to be blinking.

Once you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is a few common steps to correct this issue with your vehicle’s

• Altering the secondary air injection pump.
• The one-way check valve which might be defective needs to be changed.
• The broken air pressure sensor needs fixation.
• The faulty air control solenoid needs to be altered.
• Erosion from the connectors must be removed.
• The wires which are faulty or damaged have to be repaired or changed.
• PCM must be flashed.

If you need parts to fix this issue, you no longer need to search for them. We at PartsAvatar Canada have an extensive range of auto parts in stock from you like powertrain control module, secondary air injection pump, air flow/pressure sensor, air control solenoid valve, air pressure sensor ranging from all replacement parts to all interior and exterior parts

Here are some steps which you should follow in order to diagnose this fault code:

• Before you start the troubleshooting procedure, check for the correct Technical Service Bulletins (TSB's) which is specific for your vehicle by year, model and transmission.
• It can actually help you in saving time in the long run by guiding you in the right path.
• There might be several components included depending on the specific vehicle which includes the secondary air injection pump, check valve, pressure sensor, air control valve, and the PCM.
• Now, perform a careful inspection of the wires for damages like scraping, rubbing, or burn spots.
• Also, you have to visually check the connectors and its connections for protection, erosion and damaged pins which includes the including the PCM.
• Always refer the tech data of the vehicle to check the alignment of the circuit and make sure that every part is included within the circuit which also contains the fuse or a fuse-able link in certain applications.
• Test the check-valve to verify that the air flow is in one direction only.
• During cold weather, if you find ice in the secondary air injection pump, it is a symptom of a faulty one-way check valve where the condensation will give entry into the pump from the exhaust.

Advanced Steps

• The advanced step for each and every vehicle is specific and it needs suitable tools to accomplish diagnosis correctly.
• The process will need a digital multimeter and certain technical references for your vehicle.

Voltage checks

• Based on the specific vehicle and configuration of the circuit, both the reference voltage and acceptable range will change the troubleshooting charts and the appropriate sequence are included in the specific technical data to help with the proper diagnostic procedure.
• Continuity test has to be done to check the integrity of the wires, connectors and other connections if there is no power source or ground found in the process.
• Carry out the continuity test by removing power from the circuit and 0-ohm resistance must be set as normal reading for wires and connectors.
• The faulty wires which are open, shorted or eroded must be replaced or fixed if there is no resistance or continuity.

Common Mistakes When Diagnosing the P2439 Code

• Air control solenoid might be broken.
• Damaged PCM.
• Failure of the secondary air system pressure sensor.
• The wires might be problematic.