Guide To P20B2 OBD Error Code Solutions

1. Powertrain Control Module - Any corrosion or break in the internal wiring harness can cause a short in your PCM. If you’re PCM is shorted, then you must change the powertrain control module (ECM) as soon as possible to avoid the P20B2 error code.
2. Reductant Injection Air Pressure Control Valve - It is easy to get rid of the P20B2 error code when the faulty or broken reductant injection air pressure control valve is replaced as soon as possible.
3. Diesel Exhaust Fluid - More pollution or dust will get accumulated in the exhaust if the DEF is dirty or murky. Get rid of the dirty DEF as soon as possible.
4. Exhaust System - The performance of the vehicle during startup will be erratic. It one such situation it’s best to replace the exhaust system as it might be defective.
5. Diesel Particulate Filter - If the DPF is damaged, then the fuel economy will be very low. Get rid of the faulty DPF to avoid P20B2 error.
6. Reductant Heater - A faulty or defective reductant heater has to be replaced or changed quickly to avoid further troubles.
7. Reductant Tank Heater Control Module - Are you looking to replace the faulty reductant tank heater control module? Then get them from Parts Avatar at the best prices online.

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 P20B2 here:

Common Symptoms

• Regeneration by the DPF will be impossible or it might not take place.
• Malfunctioning of the powertrain control module.
• The improper functioning of the reductant heater and sender assembly.
• Failure of the reductant tank heater control module.
• An issue related to electrical wires.

Want to correct the Trouble Code P20B2? Read these points mentioned below:

• Fixing the electrical connection of the reductant heater coolant control valve circuit which might appear to be weak.
• The faulty reductant heater coolant control valve must be changed.
• The malfunctioning circuit or the harness of the reductant heater coolant control valve must be fixed.
• The dirty diesel exhaust fluid has to be replaced.
• Replacing the defective diesel particulate filter.

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

• The engine system along with the powertrain control module or the engine control module will initiate the P20B2 code solenoid valve so that it controls the oil pressure to the engine mechanism that is inserted into the valve system and the timing of the valve between high and low can be switched.
• A diagnostic trouble code will get stored in the vehicle if there is any open or short circuit in the system.
• 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 heater coolant control valve 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 heater coolant control valve 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 P20B2 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 P20B2 Code

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