Error Code P20CD: What It Means & What To Do?

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Baffled? Can’t comprehend the error code P20CD? Well, Parts Avatar is here at your service! We have written here all that you need to know the error code P20CD. ‘ Exhaust aftertreatment fuel injector "A" control circuit low’ in simple terms is also known as the OBD-II code powertrain control module (PCM) failure. It can be seen that the diesel exhaust fluid (DEF) is employed to help while converting the remaining exhaust particles to harmless gases. A high temperature in the exhaust system is required in order to burn off those particles. The temperature is brought to level by the diesel particulate filter when the DEF fluid is injected into the exhaust stream. Then the system performs the task of converting the harmful NOx to nitrogen, carbon dioxide and water. The code P20CD sets in when the DEF injector fails to operate correctly.

It should be noted that, the exhaust fuel addition injector assembly is located on the outlet of the turbocharger sub-assembly. Low-pressure fuel is transmitted to the exhaust fuel addition injector assembly through the feed pump in the supply pump assembly. As the engine control module (ECM) sends a control signal, fuel is added by the exhaust fuel addition injector assembly. Further the injector serves two different controls namely the particulate matter (PM) forced regeneration and PM reduction.

What causes this problem with the Exhaust Aftertreatment Fuel Injector A Control Circuit Low?

• A defect in the exhaust aftertreatment fuel injector 
• Loose or short circuited exhaust aftertreatment fuel injector harness
• Deficient electrical connection in the exhaust aftertreatment fuel injector circuit

1. Powertrain control module - This essential unit if damaged can cause erratic engine performance and sluggish engine start. We recommend you to change it as soon as possible in order to overcome these complications caused by the error code P20CD.
2. Diesel exhaust fluid pump - A contaminated diesel exhaust fluid pump is the chief host inviting a number of problems like a potential damage to components, including DEF dosing pump and diesel particulate filter. It is advised to get it changed immediately. Log into Parts Avatar now.
3. Exhaust aftertreatment fuel injector - See the error code P20CD popping again and again? Deteriorating engine performance? A fall in the engine performance? Yes, all this is caused due to a malfunctioning exhaust aftertreatment fuel injector. Log into Parts Avatar, your one stop destination for your new exhaust aftertreatment fuel injector offered at budget friendly prices.
4. Fuel injector - Facing a difficulty in starting the vehicle? Rough idle? It happens due to a distorted fuel injector. Tune into Parts Avatar for top notch fuel injectors delivered right at your doorstep.
5. Diesel particulate filter - Love travelling but hate the halts? Well, dirty or jammed diesel particulate filter not only triggers the error code P20CD but also problems like a deactivation of the start/stop button. Now get your error code P20CD fixed right here with us. What are you waiting for? Get your filter changed now.
6. Ohmmeter - Is your instrument cluster not functioning? Yes, you might need an ohmmeter to help you diagnose the error code P20CD. Don’t know where to get yours? Well, tune into Parts Avatar to grab some amazing deals on superior quality products.
7. DEF injector - Stressed? Can’t figure out the reason behind the error code P20CD and all these problems including an overall fall in the engine performance. All of this is likely caused due to a bad DEF injector. Tune into Parts Avatar to get your DEF injector changed now.

If you are facing OBD error code P20CD, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• A fall in the engine performance
• Increase in the emission of black smoke from vehicle exhaust
• Decreasing fuel efficiency
• Other codes related to EAS/SCR

It is very important to fix the fault code P20CD. So here are some ways with which you can correct this issue

• Mend or restore a damaged exhaust aftertreatment fuel injector
• Measures should be taken to fix loose or shorted exhaust aftertreatment fuel injector harness
• Repair or replace the weak electrical connection running in the exhaust aftertreatment fuel injector circuit

To do all this, you will need few high quality auto parts such as PCM, diesel exhaust fluid, exhaust aftertreatment fuel injector, fuel injector, diesel particulate filter, EAS, ohmmeter, DEF injector, automatic transmission control module and so on. From where will you get them? From your local store? Well, why go there when you can order quality parts with us while sitting in the comfort of your home. So, just browse through our website and order your needed parts today.

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

Firstly, start with using a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle specific diagnostic information to diagnose the code P20CD. Next, locate a technical service bulletin (TSB) that parallels the vehicle year, make/model as well as the engine size, code/s stored and symptoms exhibited, as it proves to be really helpful while diagnosing the code. A visual inspection of the EAS wiring harnesses and connectors should be performed. All the corroded or defective wiring or connectors should be mended or restored before moving onto the next step

Connect the scanner to the vehicle diagnostic connector to restore all the stored codes and relevant freeze frame data. It is essential to write down the information as it helps greatly while performing the diagnosis. The vehicle should be test driven till the PCM enters the readiness mode or the code resets. If the PCM enters the readiness mode or the code resets, the following things should be noted: if the code is intermittent, it can be quite challenging to diagnose it. In such cases, the conditions may be left to worsen

before an accurate diagnosis can be made

Also, if in case the code reappears immediately, the next step of the diagnosis would require the vehicle information source in order to obtain diagnostic flow charts, connector pin-out charts, connector face views along with the component testing procedures and specification. The vehicle information source should be used to pinpoint the exact location of EAS fuel injector A. Next, utilize the DVOM to probe the power supply to the EAS control system. All the fuses should be tested with the circuit loaded to prevent misdiagnosis. Use the scanner to actuate the EAS fuel injector (solenoid) and test output control circuit voltage, if the appropriate power (battery voltage) and ground circuits are found

In case, if there is a deficient voltage, a damaged controller (with a programming error) should be suspected. The DVOM should be used to test the EAS fuel injector, if the voltage output circuit falls within the parameters. A failed injector should be suspected if it fails to comply with manufacturer’s specifications.

Common Mistakes When Diagnosing the P20CD Code

Here we have listed for you all the mistakes that should be avoided:

• A failed DEF injector
• A malfunction in the powertrain control module
• Wiring problems in the system