P202D OBD Error Code: Problem & Solutions

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P202D error is a general type of powertrain control module issue and is known as reductant leakage. The DEF helps to convert the remaining exhaust particles into gases that are harmless. The temperature of the exhaust system has to be increased in order to burn off these exhaust particles. The DPF is brought to the expected temperature when the DEF is injected into the exhaust stream which then converts the dangerous NOx into nitrogen, carbon dioxide, and water. Failure of the DEF injector to function normally will set the P202D error in the vehicle.

This is a common type of trouble code and is applicable to every newer vehicle, but at the same time it is not restricted to vehicles from Ford, Mercedes-Benz, Dodge, Chevrolet, etc. though it is a common type of error, the repair process will change based on the year, make model and configuration of the PCM. If the P202D error is found, it means that the PCM had identified a deficient degree of action in the control circuit of the reductant/regeneration supply pump.

Though there might be a few applications equipped with a NOx trap, the reduction of the exhaust emission is done by the catalyst system. In the reduction of NOx, the EGR system will always stay one step ahead. However the present diesel engines which are powerful are not able to fulfill the strict federal US emission standards along with the EGR, diesel particulate filter/catalytic converter, and NOx traps all alone. For this reason, the SCR was invented. Into the exhaust system which is placed in front of the DPD, NOx trap and the catalytic converter, a reductant compound or DEF is injected by the SCR system through the reductant injection valve. The temperature of the filtration element will be raised by the precisely timed DEF injection by allowing it to work more perfectly. Very less harmful exhaust emission will be sent into the atmosphere and the longevity of the filtration element will be improved. The monitoring and controlling of the SCR system are done by the PCM or stand-alone controllers. The controller will also look after the O2, NOx, and exhaust temperature sensor to identify the correct time for DEF injection. In order to preserve the exhaust temperature within the suitable parameters, accurate DEF injection is needed which will also optimize the pollutant filtration. The reductant/ regeneration supply pump will also force the DEF into the liquid reductant system as and when needed. The PCM monitors the supply pump voltage for steady fluctuation and load percentage. One or more pressure sensor is also monitored by the PCM in the reductant supply system to identify if there is any leakage.

What causes this problem with the Reductant Leakage?

• The reductant fluid tank or the lines might be leaky.
• Leakage in the internal reductant supply pump.
• The reductant tank pressure sensor might be poor.
• An opening might be found in the reductant supply control or the circuit might be shorted.
• Faulty PCM or programming issue/ SCR controller might be defective.
  

1. Powertrain control module - The powertrain control module will monitor and compensate for any change in altitude and looks after the overall health of your car. The right replacement for your faulty powertrain control module can be found at Parts Avatar at the best prices.
2. Diesel exhaust fluid - There will be a loss in DEF effectiveness if the diesel exhaust fluid is bad. Replace the dirty diesel exhaust fluid as soon as possible.
3. Exhaust system - An increased engine noise is an indication that the exhaust system has to be repaired or replaced. Avoid the P202D error by replacing the faulty exhaust system.
4. Diesel particulate filter - If your vehicle experiences too much power loss, then the diesel particulate filter can be faulty. Replace the damaged DPF quickly to avoid power loss.
5. Catalytic converter - If the exhaust valve is leaky, then the catalytic converter can turn out to be faulty. Get the best catalytic converter for your vehicle from PartsAvatar.
6. Pressure sensors – If the pressure sensor is defective, then there will be a decrease in power, acceleration and fuel efficiency. Get rid of the damaged pressure sensors as soon as possible.
7. Exhaust temperature sensors - Improper regeneration of the DPF can likely damage the exhaust temperature sensor. Replace it quickly to avoid the P202D error code in the vehicle.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P202D code by mentioning some major symptoms below:

Common Symptoms:

• Minimized fuel efficiency.
• The emission of black smoke will be more from vehicle exhaust.
• The engine performance is lessened.
• There might be other error codes associated with SCR.
• Regeneration by the DPF will be impossible.

Have a look at some ways with which you can correct the P202D code:

• Fixing the defective SCR controller/ PCM.
• The leakage in the reductant tank fluid must be repaired.
• Fixing the leakage in the internal reductant supply pump.
• Repairing the opening or short circuit in the reductant supply control circuit.

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of powertrain control module, diesel exhaust fluid, exhaust system, injection, filter, pump, converter, pressure sensors, exhaust temperature sensors, and many more. Now all your problems would vanish within no time.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• The P202D diagnostic trouble code is not very difficult to diagnose or carry out.
• If this error code appears in your vehicle it is always best to have a qualified technician or mechanic to look at this error code, where he will use a scanner to find out the problem.
• With the help of a scanner, the mechanic will recover every of the stored codes and freeze frame data by connecting it to the diagnostic port of the vehicle.
• Initially, the mechanic will begin by checking the reductant heater coolant control valve as it can cause issues in your vehicle.
• At times, these valves might be damaged or broken. Also, they can be one of the reason if the error code is stored in the vehicle.
• After fixing this error, the mechanic will then check for any openings or shorted circuit in the harness of the reductant heater coolant control valve
• Additionally, he will also check the electrical connection of the reductant heater coolant control valve circuit. Necessary repairs will be carried out if they are found to be defective.
• Finally, the powertrain control module will be inspected for any damages.
• Once every diagnosis and repairs are properly done, it is very important to reset the code and test drive the vehicle to see if the error codes, still appear and if the engine light keeps blinking.

Common Mistakes When Diagnosing the P202D Code

• Failure of the DEF injector.
• An issue with wires.
• Failure of the powertrain control module.