Error Code P20A0: What It Means & What To Do?

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The trouble code P20A0 can be defined as Reductant Purge Control Valve Circuit /Open. This trouble code would indicate that there is an open circuit detected by the PCM. 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.

It is always good to learn more! That is the reason why we are here to help you out in gaining more knowledge about the P20A0 error code. 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.

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

• Faulty control module ground strap
• Malfunctioning reductant purge control valve
• Unusable wiring
• There can be distorted or loose connector
• Quirks in the fuse or fuse-able link
• The PCM or ECM might be damaged

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Fuel Injector - Facing some issues in starting your vehicle? Poor idle issues? Failed emissions? These are all the symptoms of bad, faulty, leaking and clogged fuel injectors. It would be a good decision to replace your defective fuel injector with a new one online.
5. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P20A0 code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up
• Diminishing fuel efficiency
• Declining engine performance

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 P20A0:

• Replacing damaged connectors, terminals, or wiring associated with the reductant injector
• Make sure to mend faulty electrical connection
• It is essential to restore the flawed reductant purge control valve
• Rehabilitate the defaults in the wiring harness
• Carefully adjust the blown fuse or fuse-able link
• You must fix the defective ground straps

However, if you face any issue then we have stocked a wide range of best priced 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 more to help you out in fixing your car.

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

A good starting point is always a technical service bulletin search for your particular vehicle. Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your 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.

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. If the resistance is present, then it would indicate that there is loose connection or sometimes there are chances of corrosion.

Common Mistakes When Diagnosing The P20A0 Code

• Non performance of the powertrain control module
• Failure in the car wiring
• The reductant purge valve might not function properly