P20B1 OBD Error Code: Problem & Solutions
OBD Code P20B1 - Reductant Heater Coolant Control Valve Circuit/Open
Is the diesel exhaust fluid faulty? Are you
looking for the diagnostic steps for P20B1 error code? Then keep reading
further as you are at the right place. The conversion of the remaining exhaust
particles into harmless gases is carefully assisted by the diesel exhaust fluid
(DEF). The temperature of the exhaust system has to be more so that the
leftover exhaust particles can be easily burnt off. In order to bring the
diesel particulate filter up to the expected temperature, the DEF fluid has to
be injected into the exhaust stream. This will finally help in the conversion
of harmful NOx into nitrogen, water, and carbon dioxide.
Learn More About OBD Error Code P20B1
The excessive NOx which was still available in the exhaust stream can be reduced with the help of reductant catalyst (SRC). The DEF is heated by the reductant tank heater so that the freezing of the fluid can be avoided. The malfunctioning of the reductant tank heater will be identified by the engine control module and the P20B1 error code will be set in the vehicle.
What causes this problem with the Reductant Heater Coolant Control Valve Circuit/Open?
- Damaged reductant heater coolant control valve.
- There might be an opening or the reductant heater coolant control valve module harness might have a short circuit.
- The electrical connection of the reductant heater coolant control valve circuit might be weak.
Replace/Repair These Parts To Fix Code P20B1
- 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.
- Reductant Injection Air Pressure Control
Valve - Find the right replacement for a faulty
reductant injection air pressure control valve from Parts Avatar at affordable
prices online.
- Diesel Exhaust
Fluid - A bad DEF will lightly appear to be colored
and cloudy as well as it might be contaminated with dirt particle. Replace the
contaminated DEF quickly.
- 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.
- Diesel
Particulate Filter - Do you find any strange or bad smell? Then
the DPF can be burnt which has to be replaced quickly.
- Reductant Heater - An
easy way to get rid of the P20Bo1 trouble cde is to repair the faulty or
defective reductant heater as soon as possible
- Reductant Tank Heater Control Module - Visually inspect the reductant tank heater control module. If it is damaged, replace them as soon as possible.
Symptoms Of the OBD Error Code P20B1
t 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 P20B1 here:
Common Symptoms
- The possible chances of DPF regeneration might be very less.
- Flashing of the engine light or the service engine will indicate you with a warning light.
How To Correct P20B1 Reductant Heater Coolant Control Valve Circuit/Open
Here are some ways with the help of which you will be able to correct the OBD Code P20B1:
- Changing the faulty reductant heater coolant control valve.
- The harness or the circuit of the reductant heater coolant control valve must be fixed.
- Fixing the weak electrical connection of the reductant heater coolant control valve.
- The diesel exhaust fluid must be changed.
- The damaged diesel particulate filter needs replacement.
There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have a high-grade PCM, reductant injection air pressure control valve, diesel exhaust fluid, exhaust system, diesel particulate filter, reductant heater, reductant tank heater control module, DEF fluid and a lot more for our precious customers.
Easy Diagnosis of Engine Error OBD Code P20B1
It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20B1 code to be stored:
- Based on the type of engine, there is generally 2 main type of deactivation used for cylinder nowadays.
- In order to change the oil pressure which is sent to the lifters, the pushrod design of the P20B1 code will use the solenoids.
- The lifters will not be able to raise their companion pushrods when they are under the valve rockers arm in a collapsed state, where the valves will not be activated and will remain shut.
- This is a general type of trouble code and it is not difficult to diagnose or repair this error.
- It’s always best to give it to the professionals or technicians as they know the tactics to resolve this error where they will connect a scanner to the diagnostic port and recover the stored codes and freeze frame data.
- Performance issue can rise in the vehicle if the reductant heater coolant control valve is faulty. The mechanic will address them first.
- If the error still shows up, then he will start inspecting the harness and the electrical connection of the reductant heater coolant control valve. Any possible defects will be addressed immediately.
- Rarely, the mechanic will check the powertrain control module as they might be faulty. If they are found to be defective, the faulty powertrain control module will be replaced.
- If this error code has been made alright, then the mechanic will look for other error codes and address them first, before starting to diagnose the error code P20B1.
- After every diagnosis, the mechanic will reset the code, test drive the vehicle to see if the error code is still stored. Also, this will help the mechanic to know as to where the error occurred.
Common Mistakes When Diagnosing the P20B1 Code
- Defective powertrain control module.
- Damaged reductant heater and sender assembly.
- Reductant tank heater control module might be malfunctioning.
- Electrical wiring issue.