Error Code P20D1: What It Means & What To Do?

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Is the car engine not performing at par with the expectations? Do you notice affected fuel economy, delayed throttle response and Check Engine Light illuminated on the dashboard? This can be an indication of the problem the exhaust system of the vehicle, resulting in OBD code P20D1 getting stored in the Powertrain Control Module (PCM).

OBD code P20D1 means Exhaust Aftertreatment Fuel Injector B Control Circuit/Open Issue.

If your diesel powered vehicle has stored a code P20D1, it means that the powertrain control module (PCM) has detected no 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/Open?

• Exhaust Aftertreatment Fuel Injector failure
• Exhaust Aftertreatment Fuel Injector wiring harness problem
• Poor electrical connections to Exhaust Aftertreatment Fuel Injector circuit

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Automatic Transmission Module - Sometime the transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be check for and replaced, if required.
3. Fuel Injector - The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
4. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
5. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
6. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
7. Diagnostic Tool - Choose from our diagnostic tools collection that will come handy to detect and correct the OBD error code.

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P20D1

Common Symptoms

• The service engine soon light can start lighting up
• Decrease in the overall fuel efficiency
• There might be a lot of black smoke coming out from vehicle exhaust
• The engine performance might start declining
• Existence of some other SCR related codes

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

• Make sure to mend faulty electrical connection
• It is essential to restore the flawed EAS fuel injector
• Rehabilitate the defaults in the wiring harness
• Carefully adjust the leakage in the exhaust

If you need any parts to fix this problem you can easily find them with us. Not only that we also have in stock the best in range auto parts and that too at the most budget friendly prices ever online. Whether you need a PCM, Diesel Exhaust Fluid, Exhaust Aftertreatment Fuel Injector, Fuel Injector, Diesel Particulate Filter, EAS, Ohmmeter, DEF injector, you can simply rely on us for quality auto parts.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20D1 code to be stored:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• Then the mechanic should visually inspect the faulty as well as damaged parts.
• After that the scan tool should be utilized to inspect the EGT sensor readings and the exhaust gas pressure readings. Now once the exhaust gas temperature has been fully inspected, there would be a need of a multimeter to inspect for proper voltage at the pressure sensor.
• Check for the performance of the reductant pump in accordance with the exhaust system functions and replace it, if required.
• Check for the voltage output of the EAS fuel injector and if it doesn’t match the desired parameters, the suspect for it to be faulty and replace it immediately.

Common Mistakes When Diagnosing the P20D1 Code

• Fuel injector failure
• Powertrain Control Module (PCM) failure
• Wiring and connector issues in relation to the sensor and circuits
• Damaged or clogged fuel filter