Error Code P20B4: What It Means & What To Do?
OBD Code P20B4 - Reductant Heater Coolant Control Valve Circuit High
Do you know what are the symptoms and causes of
the P20B4 error code? Are you looking for the diagnostic steps to resolve them?
Then look no further and keep reading ahead. With the help of the diesel
exhaust fluid, the remaining exhaust particles are changed into harmless gas.
These exhaust particles can be easily burnt only if the temperature of the
exhaust system is very high. The diesel particulate filter DPF will move up to
the required temperature when the DEF fluid is injected into the exhaust stream.
Learn More About OBD Error Code P20B4
The dangerous NOx is then converted into nitrogen, carbon dioxide and water by the system. If there are any leftover NOx in the exhaust stream, they can be easily reduced with the help of reductant catalyst (SRC). The prevention of freezing of the fluid is taken care of when the DEF is heated by the reductant tank heater. The P20B4 error code will get stored in the vehicle if the reductant tank heater fails to operate properly.
What causes this problem with the Reductant Heater Coolant Control Valve Circuit High?
- Broken reductant heater coolant control valve.
- The harness of the reductant heater coolant control valve might be shorted or it might have an opening.
- The electrical connection of reductant heater coolant control valve might be worse.
Replace/Repair These Parts To Fix Code P20B4
- Powertrain
Control Module - If the sensor circuit is
shorted it will overload the engine and damage the PCM module. If you find the
powertrain control module to be damaged get the replacement from
Parts Avatar.
- Reductant
Injection Air Pressure Control Valve - The P20B4 error can be avoided if the defective reductant
injection air pressure control valve is immediately fixed.
- Diesel Exhaust
Fluid - If the diesel exhaust fluid is poor, then the
malfunctioning of the machine SCR’s system will take place. Replace it as soon
as possible.
- Exhaust System - If there is a loud roaring noise in the vehicle, then it’s high
time to replace the faulty exhaust system and get rid of the P20B4 error code.
- Diesel
Particulate Filter - Does your engine fail to
start? Does your engine find it very hard to start or accelerate? Then the DPF
can be faulty. Change it quickly.
- Reductant
Heater - P20B4 error code can get stored in your vehicle
if this component is broken or damaged. Find the replacement for reductant
heater from Parts Avatar at best prices online.
- Reductant
Tank Heater Control Module - A faulty or damaged reductant tank heater control module can make
your engine system misbehave. Replace the faulty reductant tank heater control
module quickly.
Symptoms Of the OBD Error Code P20B4
Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P20B4 code by mentioning some major symptoms below:
Common Symptoms
- Regeneration by the DPF will be impossible.
- Blinking of the engine light as well as the warning light of the service engine.
How To Correct P20B4 Reductant Heater Coolant Control Valve Circuit High
Have a look at some ways with which you can correct the P20B4 code:
- The malfunctioning reductant heater coolant control valve needs replacement.
- The broken or the damaged harness or circuit of the reductant heater coolant control valve has to be replaced.
- Fixing the electrical connection of reductant heater coolant control valve which might be worse.
- The murky diesel exhaust fluid needs replacement.
- The faulty diesel particulate filter must be changed.
There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of 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 many more. Now all your problems would vanish within no time.
Easy Diagnosis Of Engine Error OBD Code P20B4
If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:
- The P20B4 diagnostic trouble code is not very difficult to diagnose or carry out.
- If this error code appears in your vehicle it is always best to have a qualified technician or mechanic to look at this error code, where he will use a scanner to find out the problem.
- With the help of a scanner, the mechanic will recover every of the stored codes and freeze frame data by connecting it to the diagnostic port of the vehicle.
- Initially, the mechanic will begin by checking the reductant heater coolant control valve as it can cause issues in your vehicle.
- At times, these valves might be damaged or broken. Also, they can be one of the reason if the error code is stored in the vehicle.
- After fixing this error, the mechanic will then check for any openings or shorted circuit in the harness of the reductant heater coolant control valve
- Additionally, he will also check the electrical connection of the reductant heater coolant control valve circuit. Necessary repairs will be carried out if they are found to be defective.
- Finally, the powertrain control module will be inspected for any damages.
- Once every diagnosis and repairs are properly done, it is very important to reset the code and test drive the vehicle to see if the error codes, still appear and if the engine light keeps blinking.
Common Mistakes When Diagnosing the P20B4 Code
- Failure of the powertrain control module.
- Malfunctioning of the reductant heater and sender assembly.
- Reductant tank heater control module is faulty.
- An issue with wires.