Guide To P20A2 OBD Error Code Solutions

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The trouble code P20A2 can be described as Reductant Purge Control Valve Circuit Low. The error code P20A2 would start triggering when the PCM would detect some fault in reductant purge control valve circuit. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things.

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. The P20A2 trouble code would indicate that a reductant purge control valve circuit which is not as per the predetermined limit has been detected by the ECM. Now when this would occur, the fault code would be stored and there would be an illumination in the malfunction indicator light.

What causes this problem with the Reductant Purge Control Valve Circuit Low?

• Faulty wiring
• Malfunctioning reductant purge control valve
• There can be inoperative fuse or fuse-able link
• Some issues related to the control module ground strap
• Imperfect or loose connector
• There can be distorted PCM or ECM

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Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P20A2 code by mentioning some major symptoms below:

Common Symptoms

• Illumination in the service engine soon light
• The overall engine performance might start declining
• Decrease in the fuel efficiency

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 P20A2:

• Repair or replace the quirky engine control module
• Rehabilitate the defaults in the wiring
• It is essential to restore the flawed reductant purge control valve
• You must fix the defective PCM or ECM
• Carefully adjust the faults in the fuse or fuse-able link
• Recondition the non-functioning ground straps

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

The advanced steps become very vehicle specific and need the appropriate advanced equipment to perform in the right way. There would a need of a digital multimeter and the specific technical references to carry out this procedure. Voltage requirements will vary depending upon the specific year, make and model of the vehicle. Then after that the next step is to find all the constituents which are related to the reductant purge control valve circuit and then search for obvious physical damage. As per the particular vehicle, the DEF system might incorporate several constituents which include a reductant pump, purge valve, pressure sensor, integrated level sensor, temperature sensor, system heaters, filters, an electrically controlled reductant injector and a reservoir. A thorough visual inspection should be performed to inspect the related wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Then after that it is important to examine the connectors and connections for security, corrosion and damaged pins. The process should include all wiring connectors and connections to all components including the PCM or ECM. Consult the particular tech data for the automobile to check if a fuse or fuse-able link is incorporated into the circuit.

Have a look at some advanced steps

• The advanced steps become very automobile specific and need the appropriate advanced equipment to perform correctly.
• These procedures require a digital multimeter and the specific technical references for the vehicle. Now in this case, a pressure gauge may also be needed to assist the process of troubleshooting.

Have a look at some voltage checks

• The reference voltage and the acceptable ranges might differ depending upon on the particular vehicle and the circuit configuration.
• Particular technical data will include troubleshooting charts and the appropriate sequence to follow assisting you with correct diagnosis.
• Now if an absence of a power source or ground is identified in this process, then there would be a need of continuity testing to inspect integrity of the wiring, connectors and other constituents.
• Make sure to perform continuity tests with the power removed from the circuit and the normal readings for wiring and connections should be 0 ohms of resistance.
• Resistance or no continuity would indicate that there are some faults in the wiring, so it should be repaired or restored.
• Then a continuity test should be performed from the PCM or ECM to the frame will confirm the serviceability level of ground straps and ground wires.
• The presence of resistance would indicate that the connection is loose or there is corrosion.

Common Mistakes When Diagnosing The P20A2 Code

• Some issues related to the reductant purge valve
• Failure in the powertrain control module
• Issues related to the wiring