P20DC - OBD Trouble Code

Want to learn something more about the P20DC fault code? Diesel Exhaust Fluid (DEF) helps in converting harmful exhaust particles to harmless gases. For burning these particles, the temperature of the exhaust system has to be increased. The DEF Fluid with the help of the injector is sent into the exhaust stream to raise the Diesel Particulate Filter (DPF) up to optimal temperature. The exhaust system then converts harmful nitrous oxide compounds to nitrogen, carbon dioxide, and water.

What causes this problem with the Exhaust Aftertreatment Fuel Supply Control Stuck Closed?

• There can be inoperative EAS fuel supply pump
• Flaws in the EAS fuel pressure sensor
• There can be opened or shorted wiring in the EAS fuel supply control circuit
• The DEF in the EAS reservoir might not be sufficient enough
• Some issues related to the EAS controller/PCM or programming error

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
5. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
6. Automatic Transmission Module – Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
8. Fuel Injector - The fuel injector meters the fuel more precisely than a carburettor. Therefore, no fuel is wasted. The result of such precise metering is increased power, lower emissions and lower fuel consumption. The right amount of fuel is squirted into the combustion chamber or throttle body. Thus, replace faulty fuel injector today!
9. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!

Here are some steps which you should follow in order to diagnose this fault code:

• Take the help of an experienced mechanic who will visually inspect the EAS wiring harnesses and connectors.
• Find and freeze frame data with the code. Then, clear the code and take the vehicle on a test drive under the same conditions.
• If the code reappears, perform a visual inspection of the components and its wiring.
• If the wiring is okay, the injector itself will be tested to confirm operation.
• The mechanic will repair or replace faults in relation to the EAS fuel supply system grounds, and EAS fuel pumps. Also check the power supply to the EAS control system.
• Check for the voltage output from the EAS fuel supply system grounds and if it isn’t under the desired range, suspect it to be fault and might need replacement.
• If there is no problem found, check for the faulty ECU. Although, this fault is very rare but can be a reason for problematic exhaust system, thus hampering the engine performance. The ECU needs to be replaced in such condition and has to be reprogrammed to erase any stored faulty error.

Common Mistakes When Diagnosing The P20DC Code

• There can be some faults in the powertrain control module
• Negligence in the exhaust aftertreatment fuel supply control circuit
• Wiring problems