Guide To P203B OBD Error Code Solutions
OBD Code P203B - Reductant Level Sensor Circuit Range/Performance
The
OBD-II P203B code is defined as a Reductant Level Sensor Circuit
Range/Performance. Don’t panic when you see the check engine light illuminated,
once you have discovered the code, it’s all about diagnosing it correctly. We
have all the information you will need to understand why the code was set, and
how to diagnose it, as well as information on what repairs or replacement may
be needed to get rid of the P203B code.
Learn More About OBD Error Code P203B
This code is set when the Engine Control Module gets an unacceptable signal from the reductant level sensor. The leftover exhaust particles in your vehicle get converted into harmless gases. This happens with the assistance of the Diesel Exhaust Fluid (DEF). There is a process that enables this, it happens by increasing the temperature of the exhaust system, which in turn helps to burn off those particles. The DEF comes into the picture here, the fluid is injected into the exhaust stream which increases the temperature of the Diesel Particulate Filter. Hence it is able to convert the gasses and water. If any leftover NOx is present, then it is reduced by adding the Reductant Catalyst (SRC).
With the help of the Reductant Level Sensor, the ECM comes to know exactly how much DEF is present in the tank. The Discrete level sensor measures the tank level at three different heights, and the reductant level is measured based on how much liquid reductant is present. This makes the frozen reductant undetectable, and so the measured lever is used to calculate the exact quantity of reductant in the tank.
What causes this problem with the Reductant Level Sensor Circuit Range/Performance?
- Reductant level sensor is not working properly
- DEF storage tank has the wrong fluid in it
- Electrical short or circuits and other electrical components
Replace/Repair These Parts To Fix Code P203B
- Engine wiring connectors - Sometimes the
codes are set not because of a faulty sensor or components but connectors.
These connectors are responsible for transferring electric signals, any damages
to them can cause issues. You can repair or replace them online with us. Order
from the convenience of your home and have it delivered to you right to your
doorstep!
- Temperature sensor
- The temperature sensor is responsible
for measuring the temperature of the fuel in tank which helps the PCM to
regulate the components easily. A faulty temperature sensor can make the whole
system go haywire. Correct it through replacements and check if the P203A code
goes away, otherwise go for replacement. We offer free shipping on orders over
$99.
- Catalytic converter - Converts the toxic gases as well
as pollutants in exhaust gas coming from the engine into less-toxic pollutants,
it does this by catalyzing a redox reaction. This could be a cause for the
P203B error to set. You can go for repair or replacement depending on the
damages present. Order from PartsAvatar and track your shipment the whole way
till it reaches you.
- Powertrain Control Module - The central
processing unit of your vehicle, it monitors all the other modules and
components. The PCM replacement would require reprogramming, which can be expensive
try to repair and see if that can resolve the P203B error code. You can pick
the right PCM fitment for your vehicle on our website. It’s easy to search and
out 24/7 customer care executive can help you online too.
- Exhaust system - This mainly all the piping that guides exhaust gases away
from the combustion inside your engine engine. If you have diagnoses any
issues, repair them first and see if that has gotten rid of the P203B code. If
not, go for replacement with PartsAvatar. We ship to the remotest corners of
Canada from our warehouses.
- Exhaust Gas Temperature sensors - This is a meter
that is used to monitor the exhaust gas temperature of the combustion engine of
the vehicle. You can try to repair the damages you have found or replace it
with PartsAvatar. Order online easily today!
Symptoms Of The OBD Error Code P203B
Well, if you are looking to know about the common symptoms related to this error code P203B, we are have worked out a small list to help you discover this error code with your vehicle.
Common Symptoms
- Unacceptable reading of the DEF (Diesel exhaust fluid) level found
- The Exhaust emissions are not within the manufacturers range of specifications
- The Check engine light is illuminated
- Increase in smoke noted
- DEF warning present on the instrument cluster of the vehicle
How To Correct P203B Reductant Level Sensor Circuit Range/Performance
Once you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct P203B this issue with your vehicle’s
- Repair or replace the Exhaust system components
- Repair or replace catalytic converter
- Repair or replace the temperature sensor
- Repair or replace ECM module
- Repair or replace the damaged engine wiring and connectors
If you need parts to fix this issue, you no longer need to search for them. We at PartsAvatar Canada have an extensive range of auto parts in stock from you, ranging from all replacement parts to all Connectors, Temperature sensor, Catalytic converter, PCM, Exhaust gas, Exhaust system and EGT sensors parts.
Easy Diagnosis Of Engine Error OBD Code P203B
You can diagnose the P203B code by following the diagnostic steps below, however if you feel you aren't very confident you can take help from a professional especially in any advanced steps.
Begin with collecting all the necessary information for the diagnosis. If you have all the information handy, it will make the process faster and more accurate. Research the Technical Service Bulletins (TSB) for any issues you already knew were present. Make sure you match the TSB exactly to your vehicle's make, model, year of manufacture and engine. In case you feel you won’t be able to manage doing the diagnosis on your own, you can always take assistance from a trained diagnostician or mechanic.
You can now proceed to connect your scanner to the vehicle diagnostic port and retrieve all the codes. Now clear the codes and go on a test drive. Make note of all the codes that have set and freeze frame the data. The diagnosis has to be done for all the codes that are now present. Using the technical service bulletins and a reliable information source for your vehicle locate the Diesel Exhaust fluid storage tank. Once you have successfully located it, using a dipstick manually measure the level of the fluid. Top up the fluid and move on to the next step.
If you find that the level is still showing low after filling the DEF tank, then there’s an issue with the reductant level sensor. You will need to replace it and this may help get rid of the P203A code. Remember that replacing the sensor is tricky as it is mounted to the tank, ensure you catch any of the DEF which may come out while replacing it. Check the electrical connection of the reductant level sensor connector. To know the specific values and procedures for testing the level sensor you can refer the service data for the specific vehicle. This will be there in the TSB. You can use a multimeter to test resistance levels. If the values aren’t as needed by the manufacturer you will have to go for replacement of sensor. Finally it’s time to inspect the reductant level sensor wiring harness for any damages. You may find chafed or burned wires. All the bare wires will need to be repaired, you can also replace them if you feel that would resolve the matter properly. Also, keep in mind that the repairs should last. Now move on to the harness and ensure that it’s fastened safely and not close to the moving parts.
Common Mistakes When Diagnosing the P203B Code
- Damaged DEF tank
- Not following the diagnostic steps correctly
- Hastily replacing the sensor and overlooking the issue with the electrical system, wiring and connectors