P20D2 OBD Error Code: Problem & Solutions

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If your diesel powered vehicle has stored a code P20D2, it means that the powertrain control module (PCM) has detected improper voltage that is outside the normal expected value range within the control circuit for the exhaust aftertreatment fuel injector, designated B. The designation B indicates that multiple reductant injectors are in use.

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 convert harmful nitrous oxide compounds to nitrogen, carbon dioxide, and water. The reductant pump transfers the DEF (Diesel Exhaust Fluid) from the tank to the DEF Injector and if this EAS fuel injector fails to perform as per the powertrain control module (PCM), code P20D2 will be stored.

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

• Failed Exhaust Aftertreatment Fuel Injector
• Exhaust Aftertreatment Fuel Injector wiring and harness damaged
• Exhaust Aftertreatment Fuel Injector circuit issues

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!

Well, if you are looking to know about the common symptoms related to this error code P20D2, we are have worked out a small list to help you discover this error code with your vehicle.

Common Symptoms

• Reduced/abnormal engine performance
• Affected fuel efficiency
• Lean exhaust codes
• Engine Misfire codes stored
• Fuel smell
• Reduced acceleration and throttle response

To correct this issue you might need to undergo few replacements for the defective parts such as:

• EAS fuel injector replacement
• Circuit wiring and connector replacement
• Controller and PCM reprogramming

If you need parts to correct this problem, you can easily find them all with us at PartsAvatar. We have in stock high end auto parts from top automotive brands. So what are you waiting for? Grab best deals today with us.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• Take the help of an experienced mechanic who will visually inspecting the fuel system, searching primarily for the leak. Since the leak is considered a significant one, it should be fairly easy to locate.
• 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.
• If the EAS fuel injector is functioning properly, the technician must check for other components of the exhaust system for damages and faults.
• The mechanic will repair or replace the part that is causing the large fuel leak, once the source of fuel leak has been found.
• Check for any wiring and harness issues and correct the damaged wirings.
• If there is no problem found, check for the faulty ECU. Although, this fault is very rare but can be a reason for problematic fuel delivery 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 P20D2 Code

Always take professional help and follow the diagnosis instructions properly before coming to a conclusion or simply replacing any components. Check for the following components and system properly before coming to any conclusion to avoid any hefty repair costs that could have been avoided.

• Check for damaged or worn out wirings and connectors to various components for the fuel delivery system and replace them first
• Check for faulty fuel injector and system
• Inspect for PCM failure that can be corrected with reprogramming
• Check for clogged fuel filters and clean of replace as required