Guide To P20A6 OBD Error Code Solutions

<<See All OBD Codes

The trouble code P20A6 can be explained as Reductant Injection Air Pressure Control Valve Circuit/Open. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. 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. The reductant injection air pressure control valve circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the reductant injection air pressure control valve circuit would not be as per the specifications set by the manufacturer.

The reductant injection air pressure control valve circuit is controlled by the powertrain control module. 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 Reductant Injection Air Pressure Control Valve Circuit/Open?

• Defaults in the reductant injection air pressure control valve
• Reductant injection air pressure control valve harness is open or shorted
• Reductant injection air pressure control valve circuit poor electrical connection

1. Engine Control Module – ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
2. Electronic Control Unit – The ECU coordinates with the temperature sensor to control the blower fan for keeping the battery temperatures under control. So, replace faulty ECU components now!
3. 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.
4. Fuel Injector - Faulty fuel injector, it will cause rough idles and difficulty in starting. Also, it will affect the fuel economy and engine performance. Fuel injector can also crack or break leading to leakages and should be replaced immediately.
5. 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!
6. Powertrain Control Module – Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
7. Oxygen Sensor – Inspect for faulty O2 sensor that can affect the engine combustion process and the exhaust emissions. Thus, it is important to understand its importance and replace faulty oxygen sensor now!
8. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P20A6 here:

Common Symptoms

• Appearance of the service engine soon light
• DPF regeneration may not happen

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:

• You must fix the defective powertrain control module
• It is essential to restore the flawed reductant injection air pressure control valve
• Repair or replace the quirky reductant injector
• Rehabilitate the defaults in the reductant injection air pressure control valve harness
• The malfunctioning reductant injection air pressure control valve circuit should be repaired or replaced as per the need

Parts Avatar Canada endeavour’s to fulfil all the needs of its consumer, that’s why we have a huge collection of top quality pcm, reductant injection air pressure control valve, diesel exhaust fluid, exhaust system parts, diesel particulate filter, pcm module, ecm module and many more at equitable prices. We won’t let you down in any way.

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

• As an initial step the mechanic will carefully inspect the vehicle with the help of a scanner.
• After this, the technician will connect a scanner to the diagnostic code so that he can recover all the codes and freeze frame data.

• Note down this information as it can clearly help for further diagnosis.
• After careful inspection, he will reset the code and test drive your vehicle to check for reappearance of the codes.
• He will know that an intermittent condition persist, if the code does not return instantly.
• Then the process of diagnosis should start. The mechanic should visually inspect the reductant heater system harnesses as well as connectors.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• After that all the stored codes as well as freeze frame data should be retrieved.
• This information should be written down before clearing the codes and then the vehicle should be take out for a test drive unless and until the powertrain control module would enter the readiness mode or the code is reset.
• Now if the PCM enters readiness mode, then it would that this code is intermittent and might be very difficult to diagnose it.
• If this is the real case, then you should allow the conditions which have given contribution in storing this code to worsen before the correct diagnosis can be made.
• Carefully reset the code and then the source of vehicle information to get diagnostic flow charts, connector pin out charts, connector face views, as well as component testing procedures and specifications should be searched.
• This information would be very helpful in completing the next step of your diagnosis. The DVOM should be used to check the power supply to the SCR control system.
• The fuses with the circuit loaded should be inspected so that the misdiagnosis can be avoided.
• Now if the right power (battery voltage) and ground circuits have been located, then a scanner should be used to activate the reductant injection air pressure control valve and check the output control circuit voltage.
• Then if the voltage is not sufficient, then it would that there are some faults in the controller or it might have faced a programming error.
• If the voltage output circuit is as per the parameters set by the manufacturer, then DVOM should be used to check the reductant injection air pressure control valve. If the valve is not as per the specifications set by the manufacturer, then it would mean that it has a failure. It is very important to replace it.
• Most often, whenever the mechanic carries out any repair work, he will reset the code and test drive your car, to check if the codes return immediately.
• This can preferably help the mechanic to know what caused this error code in the vehicle.

Common Mistakes When Diagnosing The P20A6 Code

• Non performance of the reductant injection air pressure control valve

• Failure in the powertrain control module
• Issues related to the wiring