Guide To P20B6 OBD Error Code Solutions

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Are there any openings or is the circuit of the reductant metering unit heater control circuit shorted? Is the electrical connection weak? Then it’s most probably because of the P20B6 error code which is stored in your vehicle. This error code usually relates to the wiring issue in the vehicle and is generally known as the reductant metering unit heater control circuit performance. It is the responsibility of the reductant DEF system which is the heating unit to make sure that the freezing or crystallization of the DEF fluid does not take place between the tank and the injector. The improper functioning of the heating unit will store the P20B6 error code in the vehicle.

The amount of oxygen in the exhaust can be measured with the help of oxygen sensors so that they can find out how rich or lean the air and fuel ratio is, in the cylinder. When you optimize this mixture the fuel economy will be better and the exhaust emission will be less.

What causes this problem with the Reductant Metering Unit Heater Control Circuit Performance?

• Malfunctioning of the reductant metering unit heater control.
• The reductant metering unit heater control harness might have a short circuit or you might find an opening.
• The electrical connection might be poor in the circuit of the reductant metering unit heater control.

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2. Diesel Exhaust Fluid System - The DEF system can turn out to be faulty if the fluid is not filled up to the correct level. Fix the issue and avoid the P20B6 error code getting stored.
3. Diesel Exhaust Fluid - The shutdown or de-rating of the engine system may take place if the diesel exhaust fluid is very poor. Change it quickly to avoid the P20B6 error code in the vehicle.
4. Heater Module - The heater module can cause leaking due to excessive corrosion which in turn can cause damage to the engine system. Fix or replace the heater module as soon as possible.
5. Heater Module Switch - A broken or damaged heater module switch may not function properly. Get rid of the broken switch by replacing with a new one from PartsAvatar.
6. Powertrain Control Module - Malfunctioning of the powertrain control module can arise due to power relay or voltage issues. Changing the defective PCM can help you to get rid of the P20B6 error in your vehicle.

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 P20B6 here:

Common Symptoms

• Regeneration by the DPF will not be found.
• You might find the engine light or else the warning light of the service engine turned on.

Want to correct the Trouble Code P20B6? Read these points mentioned below:

• The reductant metering unit heater control which is not functioning properly must be replaced.
• Both the circuit as well as the harness of the reductant metering unit heater control needs replacement.
• The unclear diesel exhaust fluid must be altered.
• The damaged heater module switch needs replacement.

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20B6 code to be stored:

• The opposite pairs of cylinders will be turned off by the actual multi-,displacement system, which enables the system to have three different types of configurations and displacements.
• The diagnostic procedure for P20B6 error code is very elaborate which involves displaying the engine trouble codes on the air conditioning system.
• In most cases, the system was problematic and wrongly understood by the customers and as a result a list of unpredictable failures made the technology to quickly retire.
• This is a general type of error code, where the mechanic will use a scanner to check for the stored error codes.
• To the diagnostic port, the mechanic will attach the scanner so that every of the stored codes and freeze frame data is retrieved.
• As a first step, the mechanic will start inspecting the reductant metering unit heater control as it can give rise to issues in the vehicle.
• After this, the mechanic will start inspecting the electrical connection and as well as the harness of the reductant metering unit heater control for any openings or short circuit.
• If they are defective or if the electrical connection in the circuit is weak, the mechanic will replace and repair them as needed.
• As a very rare case, the mechanic may come across the faulty powertrain control module which has to be replaced.
• After every diagnostic process is carefully done, make sure that you reset the code and test drive the vehicle. This has to be done to see if the error codes still appear.
• This step will eventually help the mechanic or the technician to know if the code is still stored and help him to locate the area as to where the fault occurred.

Common Mistakes When Diagnosing the P20B6 Code

• The wires might cause trouble if they are damaged.
• Defective delivery module heater.
• Damaged power heater module power switch.