P20A5 OBD Error Code: Problem & Solutions

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The trouble code P20A5 can be defined as Reductant Purge Control Valve Stuck Closed. The reductant purge control valve circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the reductant purge control valve circuit

would not be as per the specifications set by the manufacturer.

The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile. Here the PCM has detected some fault in the reductant purge control valve circuit. The main role of the reductant purge control valve circuit is to send a signal to the powertrain control module or the engine control module. It would act as a reference point to decide when the reductant pump needs to reverse flow as well as the purge the DEF system. This process would be helpful in converting leftover exhaust particles into harmless gases. The DEF system converts the harmful NOx gases to nitrogen, carbon dioxide, and water to protect the environment.

What causes this problem with the Reductant Purge Control Valve Stuck Closed?

• Malfunctioning fuse or fuse-able link
• PCM or ECM might be flawed
• Unusable reductant purge control valve
• The control module ground strap might not be functioning properly
• Defective wiring
• Quirks in the connector

1. Diesel Particulate Filter – The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
2. Engine Control Module – It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
3. Diesel Exhaust Fluid Heater – If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
4. Exhaust System Parts - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!
5. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus check and replace it, if required.
6. Electronic Control Unit – The ECU manages the cooling system to control the battery operating temperatures and thus must be replaced, if found faulty. Thus, buy new ECU modules and components from us!
7. Diagnostic Tool – Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!

Willing to know some common symptoms of OBD Trouble Code P20A5? Your wish is our demand. Have a look at them below:

Common Symptoms

• Visibility in the check engine light
• The performance of the engine might not be good
• Issues related to diminishing fuel economy

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 P20A5:

• Make sure to replace the blown fuse or fuse-able link
• It is essential to restore the flawed wiring, connectors, or components
• The malfunctioning PCM should be repaired or replaced as per the need
• Carefully adjust the faults in the reductant purge control valve
• Adjust the flawed PCM or ECM
• Recondition the non-functioning ground straps

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade pcm, ecm, reductant purge control valve, diesel exhaust fluid, reductant tank heater, DEF system, reductant pump, reductant purge control valve, pressure sensor, temperature sensor, filters, reductant injector, fuse able link and a lot more for our precious customers.

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

A good starting point is always a technical service bulletin search for your particular vehicle. A technician begins by hooking the vehicle to an OBD-II scanner to verify that the code is present, and check for other codes. The freeze frame data along with current data is recorded, and the codes are then cleared to see if they reoccur. Visual inspection of the wiring and connectors to check for loose connections, corrosion, or shorts is done. Then the process of diagnosis should start. 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. The advanced steps become very automobile specific and need the appropriate advanced equipment to perform correctly. These procedures require a digital multi meter 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. 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 P20A5 Code

• There can be a failure in the powertrain control module
• Defaults in the reductant purge valve
• Some issues related to the wiring