P20A7 - OBD Trouble Code

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The trouble code P20A7 can be described as Reductant Injection Air Pressure Control Valve Performance. The main role of the reductant injector is to lower the noxious gases which are being expelled via the diesel particulate filter (diesel engines) or catalytic converter. 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. This would also give rise to the illumination of the check engine light.

The P20A7 fault code would start appearing if the PCM has detected a malfunction in the reductant injection air pressure control valve circuit. The reductant injection valve is generally utilized to meter and atomize the reductant liquid before it is mixed with the exhaust gas. Its normal operating frequency is between 3 Hz and .3 Hz.

What causes this problem with the Reductant Injection Air Pressure Control Valve Performance?

• Some flaws in the reductant injection air pressure control valve
• Reductant injection air pressure control valve harness might be opened or sometimes shorted
• Reductant injection air pressure control valve circuit might have inadequate electrical connection

1. Electronic Control Unit – ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
2. Automatic Transmission Module – Sometimes the automatic transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be check for and replaced, if required.
3. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
4. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
5. Oxygen Sensor – If the fuel to air ratio is not correct, the engine may work in lean or rich conditions. This not only hampers the performance output, but also affects the fuel economy, exhaust emissions and acceleration. Thus, a faulty oxygen sensor must be replaced as if it important for keeping in check the oxygen levels entering/exiting the engine.
6. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
7. Diagnostic Tool - In order to be that DIY guy, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so, so why not have a look?

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P20A7. They are mentioned here as follows:

Common Symptoms

• Check engine light can start flashing up
• DPF regeneration may not take place

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 P20A7:

• Carefully adjust the faults in the reductant injection air pressure control valve harness
• It is essential to restore the flawed reductant injection air pressure control valve
• Repair or replace the quirky electronic control unit
• Rehabilitate the defaults in the reductant injection air pressure control valve circuit
• Recondition the non-functioning PCM or programming error

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Do you wish to diagnose P20A7 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle. After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process. Then the process of diagnosis should start.
• The mechanic should visually inspect the reductant injection air pressure control valve 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. Now when the car is taken out for a test drive, if the P20A7 code does not return soon, he will know that there is an existence of erratic condition.

Common Mistakes When Diagnosing The P20A7 Code

• The reductant injection air pressure control valve might start failing
• Non observance of the powertrain control module
• Some issues with the car wiring