P203F OBD Error Code: Problem & Solutions

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It can be scary to find an OBD code set, but don’t worry we have all the information needed for you to be able to diagnose the P203F trouble code. This code is defined as Reductant Level Too Low and is set by the PCM when it detects an improper signal from the Reductant Level Sensor. Read more in this article about the diagnostic steps to follow to resolve this code.

The discrete level sensor is responsible to measures the tank level at 3 different heights. The frozen reductant will not be detected as it’s not in liquid form. The measured level will be used to update the calculation of the remaining quantity of reductant present. This level sensor has four superior quality stainless steel pins. Three of these are used for evaluating the level while the fourth is used as a ground pin. The electric connectivity feature of the urea helps in determining the level of the tank is below or above the level sensor position of the respective sensor. The ECU will evaluate all this information and set the code is there’s any problem noticed. Once the code is set the check engine light will be turned on so that the driver knows that there’s an issue that needs attention.

What causes this problem with the Reductant Level Too Low?

• Reductant level sensor has issues
• Improper fluid in the DEF storage tank
• Electrical short near the sensor

1. Discrete Level Sensor - Is responsible for checking the level of fluid in the tank. Any incorrect signal from it can cause confusion in the system. Find the perfect one for your vehicle from the large variety we have at PartsAvatar.
2. Engine Control Unit - Is responsible for controlling a series of function of actuators on an internal combustion engine to ensure proper engine performance. Find replacement on PartsAvatar and get rid of the P203F code from flashing.
3. Diesel Exhaust Fluid Level Sensor - Is the sensor that constantly keeps a check on the DEF. This is important for the vehicle to function smoothly. The P203F error is also caused if there’s an issue with sensor. Find the best replacement by ordering online on PartsAvatar and have it reach you in just days!
4. Fuel Filler Neck - A part that connects the gas cap and the fuel tank. Any damages to it can cause the P203F code to set, so repair or replace as needed. PartsAvatar offers free shipping on orders over CAD $99.
5. Engine Control Module -The brain of your vehicle that monitors and controls all the other modules. Repair any issues or replace it with PartsAvatar. Replacement will require reprogramming, so make sure you take help from a professional and get rid of the P203F code.
6. Diagnostic Tools - Inaccurate diagnostic tools are not good for diagnosis, also if you’re looking for diagnostic tools for your vehicle, we have you covered. Simply order online and track your shipment till it reaches your doorstep. We ship to the remotest corners of Canada.

After knowing all the cause behind the issues, let’s have a look at few common symptoms of this problem. Read through this section to learn more about this error code.

Common Symptoms

• You have the check engine light on
• A suspicious increase in the exhaust smoke is present
• DEF warning light is present on your vehicle's instrument cluster
• The reading of the DEF (Diesel exhaust fluid) level is not accurate
• Your vehicle’s exhaust emissions are not within the manufacturer’s specifications

It is very important to fix the fault code P203F. So here are some ways with which you can correct this issue:

• Repair or replace the DEF
• Repair or replace DEF sensor
• Repair or replace Fuel filler neck
• Repair or replace ECM
• Repair or replace ECU
• Repair or replace discrete level sensor

There is no need to be anxious as Parts Avatar – car parts online is here to help you out! We have high-grade discrete level sensor, ECU, DEF, fuel filler neck, ECM and a lot more for our precious customers.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P203F code to be stored:

Start collecting the information necessary for diagnosis. once you have it 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.

Get hold of your OBD-II scanner and connect it to the vehicle diagnostic port and retrieve all the codes. Remember to freeze frame the data. Clear them after noting them down and go on a test drive. 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 it’s located it, use a dipstick and manually measure the level of the fluid. Top up the fluid and see you if the level is still showing low, in that case the issue is with the reductant level sensor. You will need to replace it and this may help get rid of the P203F 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. If you feel you need help then don’t hesitate to approach a trained mechanic or vehicle diagnostician.

It’s time to check the electrical connection of 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. You may also be hearing explosion like sounds from the rear of the vehicle every time you accelerate. In such case check the carburetor and ensure that the air and fuel combination is in balance, if that’s fine then inspect the distributor cap for any damages. You may find cracks or hairline splits and there can produce an engine backfire. Next move on to the spark plugs and check if they’re clean and not damaged. The engine gaskets will also have to be inspected for any damages, be thorough while doing this. There are high chances that the issue is with the wiring of the sensor so make sure all are repaired or replaced as needed. Thoroughly inspect the reductant level sensor wiring harness for damages. All chafed or burned or bare wires will have to be repaired or replaced as needed. Next, check the harness to ensure that it’s fastened safely and not close to the moving parts as that may cause damages too.

Common Mistakes When Diagnosing the P203F Code

• The DEF is below the needed level