P20A9 OBD Error Code: Problem & Solutions

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The trouble code P20A9 can be explicated as Reductant Injection Air Pressure Control Valve Circuit High. If the engine control module would detect a variation in the voltage coming from the reductant injection air pressure control valve circuit delivered performance that is outside the parameters set by the automobile manufacturer, then it would store the P20A9 fault code. This would give rise to the flashing up of the check engine light.

Do you want to gain some more knowledge about the P20A9 trouble code? 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. 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 Injection Air Pressure Control Valve Circuit High?

• Malfunctioning reductant injection air pressure control valve
• Reductant injection air pressure control valve harness might be unlocked
• Reductant injection air pressure control valve circuit might have bad electrical connection

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
3. Oxygen Sensor - The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. Thus, replace faulty O2 sensor now!
4. Automatic Transmission Module - Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
5. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
6. Fuel Injector - The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
8. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!

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 P20A9 here:

Common Symptoms

• Check engine light might come into signal
• No occurrence of the DPF regeneration

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• It is essential to restore the flawed connector pins of corrosion or loose connections at the reductant injector and air pump
• Repair or replace the quirky reductant injection air pump harness
• Rehabilitate the defaults in the reductant injection air pump circuit
• The malfunctioning ECM should be repaired or replaced as per the need
• The air pump should be restored to working order

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

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• He should scan and document the codes in the ECM; and the search for the corresponding freeze frame data for the defect.
• Inspect the reductant injection air pressure control valve wiring connections for issues like loose or corroded connections.
• It is very essential to examine the reductant injection air pressure control valve harness.
• The manufacturer pinpoint tests should be followed for the diagnosis as well as the reductant injection air pressure control valve should be restored.
• Whenever the mechanic or a trained professional, repairs any of the component like wires or connectors, he will reset the code and test drive the vehicle again to see if the error code appears again.
• This can actually help the mechanic to know if the problem is fixed.

Common Mistakes When Diagnosing The P20A9 Code

• Flaws in the reductant injection air pressure control valve
• There can be some issues in the powertrain control module
• Failure in the car wiring