Guide To P02E1 OBD Error Code Solutions

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

The diesel intake air flow control system is generally bolted to the intake manifold in the intake air stream. The amount of incoming airflow would be controlled by the DIAFCS system by varying a signal to a motor which is operated by the powertrain control module. The throttle plate which is opened or closed by the motor regulates the airflow.

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.

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 P02E1 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.

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

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

1. Air Intake System - Do you remember when was the last time you got your car Air Intake System inspected? A faulty Air Intake System can cause a lot of issues like displaying P02E1 code.
2. Engine Control Module - Are there some faults in your Engine Control Module? Don’t waste time and get them replaced or else P02E1 code can turn up.
3. Throttle Body - OBD Code P02E1 can appear because of faulty Throttle Body. Visit us to solve your auto parts related issues.
4. Powertrain Control Module - Everything is fine with Throttle Body and still P02E1 code triggering? Then you must get your Powertrain Control Module checked.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P02E1 code by mentioning some major symptoms below:

Common Symptoms

• Issues in the indicator light on
• No regeneration of the diesel particulate filter to burn off the soot build up
• Low idle speed
• Electronic throttle control symbol might start flashing
• Issue of loss of power

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P02E1:

• The malfunctioning air intake system should always be replaced
• The engine control module should be repaired or replaced
• Make sure that you replace the throttle body
• You can always replace defective powertrain control module

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

• Make sure that you 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 P02E1 code returns. If it does not, then the connections were most likely your problem. If you find out that the P02E1 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 P02E1, 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 P02E1 Code

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