Guide To P20D3 OBD Error Code Solutions

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Is the car engine not performing as per the expectations? Are you noticing affected fuel economy, increased emissions from the tailpipe and Check Engine Light illuminated on the dashboard? This can be an indication of the problem with the exhaust aftertreatment fuel injector of the vehicle, resulting in OBD code P20D3 getting stored in the Powertrain Control Module (PCM).

If your diesel powered vehicle has stored a code P20D3, it means that the powertrain control module (PCM) has detected insufficient voltage in the control circuit for the exhaust aftertreatment fuel injector, designated B. The designation B indicates that multiple reductant injectors are in use.

What causes this problem with the Exhaust Aftertreatment Fuel Injector B Control Circuit Low?

• Defective EAS fuel injector control circuit
• Broken, short or corroded wiring to the control circuits
• Poor electrical connections to the control circuit
• SCR controller programming error
• PCM failure

1. Engine Control Module - ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
2. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
3. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P20D3 error with the help of experienced mechanic. Visit us today!
4. Exhaust Gas Recirculation Valve - Bad EGR valve can cause many performance issues. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty EGR valve now!
5. Diesel Exhaust Fluid Pump - If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.
6. Fuel Injection - This system is responsible for supplying fuel with certain pressure, thus assisting the fuel delivery system and engine combustion process. Replace faulty/damaged injectors now!
7. Engine Wiring Harness - Damaged, broken or corroded wiring can cause the fuel delivery system to fail and the components to not work properly. These are easier to check and replace. Purchase new wiring harness and replace the faulty one.

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

• Reduced fuel economy
• Increased exhaust emissions
• Degrading engine performance
• CEL (Check Engine Light) illuminated
• Engine performing abnormally
• Excessive exhaust smoke on load

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 this issue with your vehicle.

• EAS fuel injector replacement
• Diesel exhaust fluid (DEF) pump replacement
• EGR valve replacement
• SCR controller reprogramming
• PCM repair and reprogramming
• Faulty wiring and harness repair or replacement

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade PCM, Diesel Exhaust Fluid, Exhaust Aftertreatment Fuel Injector, Fuel Injector, Diesel Particulate Filter, EAS, Ohmmeter, DEF injector and a lot more for our precious customers.

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

• Check for SCR controller and DEF related code error that might also get stored in the PCM along with this code, which can solve the problem easily.
• Inspect the air injector sensor and DEF pump area for any corrosion or leakages on the exterior and if found, suspect it to be failed.
• One will require tools like a diagnostic scanner, digital volt/ohmmeter, and auto motive stethoscope.
• Connect the OBD scanner and retrieve all the coded and freeze frame the data. After doing that test run the vehicle again under same circumstances to see if the code returns to make sure which codes are persistent (in case of more than one code).
• Check for damaged, broken and corroded wiring and connector to the sensor circuit and replace them, if required.
• Use the DVOM to test for voltage from the EAS fuel injector and check for fluctuations. If the readings are not under specified range, suspect for injector failure and replace it immediately.
• If everything seems to work fine, then check for faulty PCM and replace or reprogram as required.

Common Mistakes When Diagnosing the P20D3 Code

It is important to understand that there can be many other factors causing this problem rather than directly blaming the injection system completely. Always check for faulty wirings, and fuses as well as fuel injector and DEF parts for error too. Take help of professional mechanic to solve OBD code problem as this will ensure avoidance of misdiagnosis and can also help to reduce the costs associated with the repairs.

• Exhaust aftertreatment fuel injector failure
• Reductant pump control system failure
• Powertrain Control Module (PCM) failure
• Wiring and connector issues in relation to the sensor and circuits
• Damaged or clogged DEF pump