P20D6 OBD Error Code: Problem & Solutions

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Is your vehicle engine performance decreasing and you notice an increase in the fuel consumption and exhaust emissions? Do you notice the Malfunction Indicator Light illuminated on the dashboard? If there are faults in the exhaust system of the car, especially the EAS fuel injector, then P20D6 fault code is definitely going to trigger up.

If your diesel powered vehicle has stored a code P20D6, 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.

What causes this problem with the Exhaust Aftertreatment Fuel Injector B Stuck Closed?

• Engine Control Module failure
• EAS fuel injector defective
• Worn/cracked piston rings
• Cracked intake manifold

1. Powertrain Control Module – PCM program faults can lead to misinterpretation of data causing wrong OBD codes to get stored in the system, leading to vehicle showing erratic behaviour. Thus, it is important to repair, replace and reprogram the PCM and its components.
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3. Exhaust Gas Recirculation Valve – The most common signs of failing EGR valve include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty valve now!
4. Diesel Exhaust Fluid Pump – The DEF fluid pump is responsible for pushing the DEF into the catalytic converter to control the amount of harmful emission in to the atmosphere. Thus, the important component must be immediately replaced, if faulty.
5. Fuel Injector – If the fuel injector is faulty, it will greatly affect the engine performance, fuel economy and increase the emissions. Thus, it is important to realise the faults and replace it quickly. Buy new fuel injector form us today!
6. Automatic Transmission Control Module – TCM processes the input data to calculate how and when to shift gears in the transmission and generates the signals that drive actuators to accomplish this shifting. The software in the TCM is designed to optimize vehicle performance, shift quality and fuel efficiency. Thus, replace and reprogram the module as required.

Willing to know some common symptoms of OBD Code P20D6? Your wish is our demand. Have a look at them below:

Common Symptoms

• Reduced fuel efficiency
• Check engine light illumination
• Lack of engine performance
• Check Engine Light illumination

We have listed out some ways which would help you to correct the occurrence of OBD Code P20D6. They are mentioned here as follows:

• Replace the EAS fuel injector
• Fixing the issues in the circuit connection
• Reattachment of connectors properly
• Repairing open or shorted wiring
• Repair the fuse of the heater circuit
• PCM (or ECM) replacement
• Replacing the catalytic converter

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

• Visually inspect system wiring harnesses and connectors. Focus on harnesses that are routed near hot exhaust pipes and manifolds, as well as those that are routed near sharp edges like the ones found on exhaust shields.
• Search technical service bulletins (TSB) in your vehicle information source. If you find one that matches the symptoms and code/s presented by the vehicle in question, it will very likely aid you in the diagnosis as TSB listings are compiled from thousands of successful repairs.
• Connect the scanner to the vehicle diagnostic port and retrieve all stored trouble codes and freeze frame data. This information is helpful if the P20D6 proves to be intermittent so write it down for later. Now, clear the codes and see if the P20D6 is reset.
• If the code is reset, start the engine, allow it to reach normal operating temperature, and then let it idle (with the transmission in neutral or park). Check for any problem with the fuel injection system.
• Do a sound test to hear if the fuel injector working and if there is no continuous clicking sound, suspect for failed of clogged fuel injector.
• Use the DVOM to test for voltage and a ground pulse, when the engine is running. If no voltage is discovered at the connector of the fuel injector in question, use the DVOM to test system fuses and relays. Replace fuses and/or relays as needed.
• If everything seems to work fine, then check for faulty PCM and replace or reprogram as required.

Common Mistakes When Diagnosing the P20D6 Code

• Always follow the complete diagnostic procedure without skipping any steps is required as to avoid unneeded repairs. Monitor the fuel injection system and the exhaust system properly, before doing any replacements.
• P20D6 is a severe damage causing code and it should be repaired at the earliest convenience. In rare cases where the vehicle runs poorly and the fuel economy goes down, caution is advised when driving to avoid any issues.