P203E OBD Error Code: Problem & Solutions

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You were able to figure out why the check engine light was on, and discovered that the P203E code has been set in your vehicle. This error is defined as a Reductant Level Sensor Circuit Intermittent/Erratic and is set by the Powertrain Control Module (PCM) of your vehicle. The PCM will set this code when it detects an improper signal from the Reductant Level Sensor. Read on to know more about this code and how to resolve it.

Your vehicles discrete level sensor measures the tank level at 3 different heights. The frozen reductant can’t be detected because it’s contracted and not in the liquid state. So to update the calculation of the remaining quantity of reductant present, measured level will be used. This level sensor has four superior quality stainless steel pins. Each of these pins length defines the level of the tank in terms of height which has to be checked. Only three can be used for evaluation and the fourth one is used as the ground pin. The electrical conductivity feature of the urea helps to determine whether the tank level is below or above the level sensor position of the respective sensor. The Engine Control Unit (ECU) evaluates this information and ensures that everything is running efficiently, otherwise the P203E code will be set followed by the check engine light turning on.

What causes this problem with the Reductant Level Sensor Circuit Intermittent/Erratic?

• Problem in the Reductant level sensor
• Wrong fluid in the DEF storage is present
• An Electrical short is also noticed

1. Engine wiring connectors - Engine wiring connectors are electronic components that can cause great issues if not repaired or replaced. Inspect them and see if the code goes away after repairs, otherwise you will have to go for replacement. Order online for replacement from the convenience of your home and have it delivered to you right to your doorstep!
2. Temperature sensor - Has the job of of measuring the temperature of the fuel,this in turn helps the PCM module regulate the other components of the vehicle easily. A fault in the temperature sensor can make the whole system go haywire. Repair or replace them and check if the P203E code goes away. You can get free free shipping on orders over $99 from PartsAvatar.
3. Catalytic converter - Has the job of converting the toxic gases as well as pollutants in exhaust gas coming from the engine into less-toxic pollutants by catalyzing a redox reaction. This could have been the reason you have the P203E code to set, so ensure it’s working properly. Repair or replace considering the damages present. Order from PartsAvatar and track your shipment the whole way till it reaches you.
4. Powertrain Control Module - It is the significant module of your vehicle which monitors all the other modules and components. The PCM replacement would be expensive and also require reprogramming from a professional diagnostician. Try to repair and fix the problem. If you opt for replacement then 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.
5. Exhaust system - Is the piping which is used to guide exhaust gases away from a controlled combustion inside an engine. Try to repair the damages present first and see if that helps get rid of the P203E code. If not, go for replacement with PartsAvatar. We ship to the remotest corners of Canada from our warehouses. So don’t worry about where you are located.
6. Exhaust Gas Temperature sensors - Is the meter which used to monitor the exhaust gas temperature of the combustion engine of the vehicle. Try to repair the damages or replace it with PartsAvatar. Order online easily today!
7. Exhaust gasket - Includes all the metal components whose job is to collect exhaust gases and transport them to the exhaust for removal from the tailpipe. Find the perfect fit for replacement at today. Order online at PartsAvatar and receive your order within days.

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 P203E here:

Common Symptoms

• The check engine light is on after the code was set
• You have noted an unusual increase in the quantity of exhaust smoke
• The DEF warning is also present on instrument cluster of your car
• The level of the Diesel exhaust fluid (DEF) is not true to the quantity present in the tank
• Even the Exhaust emissions are not in the limits specified by your vehicle manufacturer

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P203E code to be stored:

Start from the basic, which is collecting the information necessary for diagnosis. Having it handy will make the process faster and more accurate. Research the Technical Service Bulletins (TSB) for any issues you already have. Make sure you match the TSB exactly to your vehicle's make, model, year of manufacture and engine. Now proceed to retrieving all the codes by connecting your OBD-II scanner to the vehicle diagnostic port. Once you have them, clear all the codes and go on a test drive. Make note of all the codes that have set and freeze frame the data as well, just in case you have any intermittent condition present, these codes will help in figuring that out. 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 to locate the Diesel Exhaust fluid storage tank. Once you have successfully located it, use a dipstick manually measure the level of the fluid. Top up the fluid and move on to the next step. After filling the DEF tank If you find that the level is still showing low, then there’s an issue with the reductant level sensor. You will need to replace it in such a case. 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. This may help you resolve the P203E code, if not, you will have to continue your diagnosis.

Carefully check the electrical connection of level sensor, use the service data for the specific vehicle present in the TSB. Use a multimeter to test resistance levels first. If the values aren’t as prescribed by the manufacturer you will have to go for replacement of sensor. If you are able to hear explosion like sounds from the rear of the vehicle every time you accelerate you will have to check the carburetor and ensure that the air and fuel combination is in balance, if that looks fine then inspect the distributor cap for any damages. You could find cracks or hairline splits and there can produce an engine backfire. Move on to the spark plugs and check if they’re clean and in good condition. The engine gaskets will also have to be inspected for any damages.There are high chances that the issue is with the wiring of the sensor so make sure all are repaired or replaced as needed. Take assistance from a mechanic if you’re stuck anywhere or simply need help.

The last step is to Inspect the reductant level sensor wiring harness for any damages. All chafed or burned or bare wires will have to be repaired or replaced if you feel that would resolve the matter properly. Ensure that the harness is also fine and is fastened safely and not close to the moving parts.

Common Mistakes When Diagnosing the P203E Code

• Non functional DEF tank because of damage