P20C9 OBD Error Code: Problem & Solutions

This error code P20C9 will be set by your vehicle’s PCM, also known as powertrain control module when it detects faults with the diesel particulate filter system, also known as the DPF system. For those who don’t know this already, we would like to bring to your notice that this DOF system is installed in your vehicle to help in changing the leftover exhaust particles into harmless gases. To know more about this error code and few of it’s common causes, take a look at the sections below.

What causes this problem with the Reductant Control Module Requested MIL Illumination?

• Malfunctioning reductant control module
• Open or shorted reductant control module harnesses
• Faulty reductant control module electrical connection

1. Powertrain Control Module - Powertrain Control Module also known as your vehicle’s brain if faulty can be really troublesome. Don’t take risk and replace faulty PCM today to get rid of this error code P2159.
2. Reductant Tank Heater - Freezed diesel exhaust fluid? Flashing OBD error code P20C9? All of this indicates towards a faulty reductant tank heater. So, what are you waiting for? Replace the bad reductant tank heater today.
3. EGR System & Parts - If your vehicle is set to OBD error code P20C9, then chances are that your egr parts are damaged. If that is the case, you will need to undergo its replacement. You can find with us top notch egr systems and related parts.
4. Diesel Particulate System & Parts - As we all know that the diesel particulate filters and other related parts are responsible for filtering the harmful carbon particulates produced in the combustion, so you definitely can’t go with a wrong one. Replace the faulty ones today and say bye bye to OBD error code P20C9.
5. Catalytic Converter - Low level of diesel exhaust fluid is not something that you should ignore. Take care of your vehicle’s health and buy new one for your vehicle to give your vehicle the desired level of diesel exhaust fluids.
6. Diesel Exhaust Fluid - Love your environment and do your bit in reducing the air pollution by installing a well functioning catalytic converter in your vehicle. Undergo faulty cat converters replacement today get rid of OBD error code P20C0.
7. Glow Plug Control Module - For a well functioning glow plug you will need a well functioning glow plug control module. If you are having error code P20C9 then you might need to undergo glow plug control module replacement. So, don’t think twice and replace the faulty one today.

It is essential 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 P20C9 here:

Common Symptoms

• Flashing of check engine light
• Non-occurrence of DPF regeneration

Want to correct the Trouble Code P20C9? Read these points mentioned below:

• Fixing the broken or damaged wires and connectors of the reductant injector control circuit
• Changing the damaged reductant injector
• The reductant temperature sensor must be replaced
• The defective reductant temperature thermostat must be altered
• Replacing the broken PCM

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced Diesel Exhaust Fluid, Exhaust System, Diesel Particulate Filter, Reductant Control Module, Catalytic Converter, Oxygen Sensor, Reductant Control Module harness, ECM, Reductant System Parts and a lot more to help you out in fixing your car.

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

To start your diagnosis, you will need to get hold of a diagnostic scanner, digital volt/ohmmeter and a reliable source of vehicle diagnostics.

It will be really helpful if you could get hold of technical service bulletin (TSB) specific to your vehicle. Believe us it will prove to be extremely helpful for you in your diagnosis process. While choosing a TSB, make sure that it matches your vehicle year, make, and model and also the engine size. This is a general type of trouble code, where the mechanic will use a scanner to carefully look for any stored error code.

Connect the scanner to the diagnostic port of the vehicle and recover all stored codes and freeze frame data it can help him with further diagnosis. For this P20C9 error code, initially, inspect the wires or the electrical connectors of the reductant injector control circuit. Any possible damage in this component has to be fixed immediately. As a next step, visually examine some of the components like the reductant injector, reductant temperature sensor and the reductant temperature thermostat for any possible damages or defects. These components will be replaced if they are found to be faulty.

Finally, check for any possible faults in the powertrain control module and replace them quickly if there are damaged. After every of the diagnostic procedure is carefully done, reset the error code and then test drive the vehicle again. This will help you to know if the error code in the vehicle still occurs and also to locate the area as to where the fault occurred.

Common Mistakes When Diagnosing the P20C9 Code

When you undergo error code P20C9 diagnosis, few misdiagnosis are common. In order to make sure that you don’t commit any, make sure to keep an eye on the following failures: such as not taking into consideration reductant system failure that will require additional diagnosis