P20B5 OBD Error Code: Problem & Solutions
OBD Code P20B5 - Reductant Metering Unit Heater Control Circuit/Open
Do you know what does the P20B5 error code
signify? Are you looking for more information about this error code? Then you
are at the right place. The P20B5 error code is known as the reductant metering
unit heater control circuit/ open, which is related to the wiring issue in the
vehicle. The DEF fluid will be taken care of by the heating unit of the
reductant DEF system and it makes sure that no crystallization or freezing of
fluid takes place between the injector as well as the tank. If the heating unit
fails to operate as requested, then the P20B5 error will be stored in the
vehicle.
Learn More About OBD Error Code P20B5
You have to start checking the fuel pressure if the fuel fails to prim when the key is turned on and see if there are any white-bluish spark which is bright at the end of all the four plugs. You must also take care to check the mechanical timing which is as mentioned above. This description will be highly helpful when the engine fault code P20B5 displays on the engine code reader.
What causes this problem with the Reductant Metering Unit Heater Control Circuit/Open?
- The reductant metering unit heater
control might seem to be defective.
- You might find an opening in the
reductant metering unit heater control harness or the circuit might be shorted.
- The electrical connection might be poor in the reductant metering unit heater control.
Replace/Repair These Parts To Fix Code P20B5
- Reductant Metering Unit Heater - Repairing or replacing the defective reductant metering unit heater can make your engine function normally.
- Diesel Exhaust Fluid System - The check engine light will start illuminating if the DEF system is malfunctioning. Repair or replace the faulty DEF system quickly.
- Diesel Exhaust Fluid - The DEF dosing pump, as well as the diesel particulate filter will experience potential damage if the diesel exhaust fluid is very poor. Get the right DEF for your vehicle from PartsAvatar.
- Heater Module - The coolant will be leaky if the heater module is defective. Fix the damaged heater module as soon as possible.
- Heater Module Switch - Looking for the right replacement for a defective broken switch? Get them from PartsAvatar at the best prices online.
- Powertrain Control Module - The engine will fail to start or the fuel economy will be poor if the powertrain control module is faulty. Get them replaced as soon as possible so that you can get rid of the P20B5 error code.
Symptoms Of the OBD Error Code P20B5
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 P20B5 here:
Common Symptoms
- Regeneration of the DPF will not
occur.
- The service engine warning light or else the engine light will stay on.
How To Correct P20B5 Reductant Metering Unit Heater Control Circuit/Open
Here are some ways with the help of which you will be able to correct the OBD Code P20B5.
- The faulty reductant metering unit
heater control must be altered.
- The circuits or the harness of the
reductant metering unit heater control which is defective has to be changed.
- Changing the diesel exhaust fluid.
- Replacing the defective heater
module switch.
There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have a high-grade reductant metering unit heater, DEF system, DEF fluid, DEF diesel, DEF fuel, power module, power control module, module heater, heater module, heater module switch and a lot more for our precious customers.
Easy Diagnosis Of Engine Error OBD Code P20B5
It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20B5 code to be stored:
- Each cylinder’s valve will remain closed by utilizing a pair of arms which substitutes the conventional engine’s roller-type rocker arm.
- One of the arms of the P20B5 error code will follow the cam profile whereas the second arm is attached to the valves.
- With the help of a locking pin, these two arms are connected during normal engine operation.
- This is a general type of trouble code, where the mechanic will use a scanner to carefully look for any stored error code.
- He will then connect the scanner to the diagnostic port of the vehicle and recover all stored codes and freeze frame data as it can help him with further diagnosis.
- For this P20B5 error code, initially, the mechanic will carefully inspect the reductant metering unit heater control circuit.
- Any possible damage in this component has to be fixed immediately.
- As a next step, the mechanic will visually examine the reductant metering unit heater control valve harness for any opening or short circuit.
- If there is any opening or shorted circuit, they will be replaced immediately by the mechanic.
- Also, the electrical connection will be inspected and if it is found to be weak, it will be immediately addressed.
- Finally, the mechanic will 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, the mechanic will reset the error code and then test drive the vehicle again.
- This will help him to know if the error code in the vehicle still occurs and also, helps him to locate the area as to where the fault occurred.
Common Mistakes When Diagnosing the P20B5 Code
- The electrical wire faces some issue.
- Faulty delivery module heater.
- Broken power heater module power switch