P02E4 OBD Error Code: Problem & Solutions

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The OBD code decreased engine performance can be defined as a diesel intake air flow stuck open.

The volume of air which is going through the intake is controlled by the intake airflow control valve on the throttle body. If an implausible signal is detected by the engine control module from the intake airflow control valve, the powertrain control module would trigger the P02E0 fault code. If there is a failure of the intake airflow control valve, then there would be a need to replace the throttle body assembly.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Diesel Intake Air Flow Control Stuck Open?

• Short to voltage in the signal circuit to the DIAFCS motor/control
• Defects in the powertrain control module
• Short to ground in the signal circuit to the DIAFCS motor/control
• The DIAFCS motor/control might be failed
• Open in the signal circuit to the DIAFCS motor/control

1. Air Intake System - A faulty Air Intake System can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Powertrain Control Module - If everything is alright with Air Intake System, then there is surely some defect in Powertrain Control Module. Get it replaced before the situation gets worse.
3. Throttle Body - P02E4 code can display due to some issues in the Throttle Body. So, it is very important to replace the faulty Throttle Body with us at equitable prices.
4. Engine Control Module - Do you remember when was the last time you got your car Engine Control Module checked up? A faulty Engine Control Module can cause a lot of issues like displaying P02E4 code.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P02E4? Your wish is our demand. Have a look at them below:

Common Symptoms

• There might be no regeneration of the diesel particulate filter to burn off the soot build up
• Low idle speed
• Electronic throttle control symbol might start flashing
• Problem of loss of power
• The indicator light on may start malfunctioning

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• If you find out that the throttle body is defective, then it should be replaced
• You can always replace the faulty engine control module
• The air intake system should be repaired or replaced
• Replace the powertrain control module if it is defective

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of k&n cold air intake, fuel pressure regulator, mass air flow sensor cleaner and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P02E4 code to be stored:

It would be really good to check for technical service bulletins for your vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save a lot of time as well as money during the process of diagnosis. After that you must locate the DIAFCS motor/control system on your vehicle. The motor/control is generally bolted to the intake manifold in the intake air stream. Once it is located, the connector and wiring should be visually inspected. You must look for the scraping, rubbing, bare wires, burn spots or melted plastic. The connector should be pulled apart and the terminals should be carefully checked which are located inside the connector. Inspect they look burned or have a green tint indicating corrosion. You must use electrical contact cleaner and a plastic bristle brush if there is a requirement of cleaning of the terminals. Let dry and electrical grease should be applied where the terminals contact.

If a mechanical code was triggered, then you must use an intake cleaner and a clean rag to wipe out the carbon deposits behind the throttle plate of the motor control system. Spray the cleaner onto the rag and wipe out the deposits with the rag. Make sure that you never spray these deposits into the engine, as they can cause bad running, misfires and with enough intake cleaner, catalytic converter damage and possibly engine damage. If you have a scan tool, then the diagnostic trouble codes from memory should be cleared, and see if P02E4 code returns. If it does not, then the connections were most likely your problem. If you find out that the P02E4 code is not returning, then you must test the DIAFCS and its associated circuits. With the Key Off, the electrical connector should be disconnected at the DIAFCS motor/control. Connect a digital voltmeter black lead to the ground terminal at the DIAFCS motor/control wiring harness connector. Connect the red lead of the digital voltmeter to the motor terminal at the DIAFCS sensor wiring harness connector. Turn key on engine off. Check the manufacturer’s specifications; voltmeter should read 12 volts. If not, then you must repair the power or ground wire, or the powertrain control module should be replaced. Check manufacturer's specifications for complete test procedures on your specific vehicle if unsure. If the prior test passed and you continue to get a P02E4, this would most likely indicate a failed DIAFCS motor/control, although a failed PCM could not be ruled out until the DIAFCS motor/control had been replaced. If unsure, seek assistance from a trained automotive diagnostician. PCMs must be programmed or should be calibrated to the vehicle for proper installation.

Common Mistakes When Diagnosing The P02E4 Code

• Throttle body assembly failure
• Quirky wiring
• There can be some powertrain control module