P202B - OBD Trouble Code

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Do you know the symptoms and diagnostic process of P202B error code? Are you looking for even more information? Then keep reading further. P202B code generally defines a reductant tank heater control circuit low. New vehicles have DPF installed in them so that the soot emissions can be reduced. The DEF is used by the DPF to help in the burning off the soot. The DEF fluid will be heated up to the efficient temperature by the reductant tank heater. The improper functioning of the reductant tank heater will be detected by the PCM and the P202B error will be set.

This is a generic type of trouble code which might be applicable to OBD-II vehicles but there are a few exceptions like volkswagen, Mercedes-Benz, Dodge, Audi, etc. though it might be a general error code, based on the year, make, model and powertrain configuration, the repair steps will change. If a P202B error code is stored, it actually means that the PCM has identified the voltage that is insufficient in the reductant tank heater control circuit. The catalyst system holds the responsibility to reduce all the emissions of the exhaust though there might be a few applications. EGR systems are always one step ahead in the reduction of NOx. However, the diesel engines today are more powerful and larger and they are not able to meet the strict federal emission standards of the US with the EGR, DPF or catalytic converter and NOx trap solely. The SCR systems were introduced for this purpose.

What causes this problem with the Reductant Tank Heater Control Circuit Low?

• The reductant tank heater element might be defective.
• The reductant tank heater control circuit might have an open or shorted circuit.
• Poor SCR controller or the PCM might be having a programming error.

1. Diesel particulate filter - Do you find any strange or bad smell? Then the DPF can be burnt which has to be replaced quickly.
2. Powertrain control module - The PCM regulates important functions of the vehicle as well as it has a direct impact on how well your vehicle performs. Fixing your faulty powertrain control module (PCM) will help your engine to run smoothly.
3. Reductant tank heater - An easy way to get rid of the P202B trouble code is to repair the faulty or defective reductant heater as soon as possible
4. Exhaust system - You will hear a strange hissing noise in your vehicle if the exhaust system is malfunctioning. Get rid of the problematic exhaust system as soon as possible.
5. Engine wiring connector - The terminals of the engine wiring connectors must be connected properly. Else it might get damaged easily. Get the engine wiring connectors for your vehicle from PartsAvatar.
6. Catalytic converter - A damaged catalytic converter will show signs of failing when the engine misfires. Get rid of it immediately by replacing it with a new catalytic converter.

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 P02BF here:

Common Symptoms:

• Regeneration by the DPF will be impossible or it might not take place.
• Fuel efficiency is low.
• The exhaust will emit excessive black smoke from the vehicle.
• Decreased engine performance.
• Other error code related to SCR.

Want to correct the Trouble Code P202B? Read these points mentioned below:

• Changing the defective reductant tank heater element.
• The open or short circuit in the reductant tank heater element must be fixed.
• Defective PCM must be replaced.
• Changing the poor SCR controller.

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

• This is a common type of diagnostic trouble code and repairing or fixing this error is quite easy.
• It’s always best to hand it over to experienced professionals or trained technicians as they know the tactics to resolve this error when there are huge circuits involved in the system.
• The experienced professionals will connect a scanner to the diagnostic port of the vehicle and recover every of the stored codes and freeze frame data.
• Issues can take place and the error code can be stored in the vehicle if the reductant tank heater element is defective. As a very first step, the mechanic will address them.
• If the error still pops up, then he will visually inspect the harness an as well as the electrical connection of the reductant tank heater element for any openings or short circuit.
• Any possible defects will be checked and fixed immediately.
• As a very rare case, the professionals might check the powertrain control module as they might be damaged or broken. If they are found to be faulty, the defective powertrain control will be fixed immediately with a new one.
• If this faulty error code has been fixed, then the mechanic will start looking for the other error codes which might be stored in the system and address them first, before starting to diagnose the P202B error code.
• Once the diagnosis is done, the mechanic will rearrange the code and test drive the vehicle to see if the error code is still available.
• This step can actually help the mechanic to know as to where the error was stored in the vehicle.

Common Mistakes When Diagnosing the P202B Code

• Damaged powertrain control module.
• Defective reductant tank heater.
• Faulty reductant tank heater control module.
• Issues with the electrical wires.