Guide To P20D7 OBD Error Code Solutions

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Is your car having an affected performance issue? Is there black smoke emitting from the car exhaust? Is there a sudden drop in the fuel economy? All these are the indications to the OBD Code P20D7 being stored and flashed in the Powertrain Control Module (PCM).

OBD code P20D7 means Exhaust Aftertreatment Fuel Supply Control Circuit/Open Issue.

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from VW, Audi, Mercedes Benz, Ford, Mitsubishi, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration.

A stored a code P20D7 in your diesel powered vehicle means that the powertrain control module (PCM) has detected no voltage in the fuel supply control circuit for the exhaust aftertreatment system.

What causes this problem with the Exhaust Aftertreatment Fuel Supply Control Circuit/Open?

• Faulty EAS fuel supply pump
• Bad EAS fuel pressure sensor
• Open or shorted wiring in the EAS fuel supply control circuit
• Less levels of DEF in the EAS reservoir
• Faulty EAS controller/PCM or programming error

1. Engine Control Module - The Engine Control Module (also called the Powertrain Control Module or PCM) is the brains of the engine management system. It controls the fuel mixture, ignition timing, variable cam timing and emissions control. Thus check for the faults and replace and reprogram, if needed.
2. Exhaust Gas Recirculation Valve - In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Thus, replace the bad valve now!
3. Diesel Exhaust Fluid Pump – For the proper functioning of the transmission system, the diesel exhaust fluid pump needs to work properly. 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 works as the brain of the vehicle control system, making all the crucial decisions and ensuring optimal performance from all the components. Thus, faulty PCM can cause performance issues as well as save wrong OBD codes in the system. Thus, replace, repair and reprogram the PCM as required.
5. Automatic Transmission Module – An affected transmission control module can cause transmission slipping, rough shifts, performance issues, affected fuel economy and much more. Thus, it is important to replace it and reprogram it as the required settings.
6. Fuel Injector – The fuel injector is responsible for maintaining the optimal levels of the air to fuel ratios in the combustion chambers for the maximum out from the engines. It the fuel injector goes down, it hampers the entire efficiency of the engine. Thus, check and replace the bad injector now!
7. Diesel Exhaust Fluid Pump – If the DEF pump is not functioning properly, the exhaust system will not be able to properly manage the harmful emissions from the vehicle and can also result in inefficient fuel consumption. Thus, replace it now, if found defective.
8. 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!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P20D7 code by mentioning some major symptoms below:

Common Symptoms

• Check Engine Light flashing in the display monitor
• ECM indicating the stored error code
• Exponential increase in the fuel consumption pattern
• Rough engine with occasional stalling
• Lack of power and acceleration due to failure of fuel delivery system
• Black or white smoke coming from the tailpipe

Have a look at some ways with which you can correct the P20D7 code:

• Replacement of Fuel pressure regulator
• Replacement of Fuel pump
• Replacement of Fuel Supply Control Unit
• Replacement of faulty EAS fuel injectors or other fuel system related sensors
• Repairing or replacing electrical wiring or connectors
• Replacement of DEF pump relay
• Testing the fuel pressure and codes cleared with a scanner or gauge

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of Pcm, Diesel Exhaust Fluid Pump, Exhaust System, Diesel Particulate Filter, Fuel Injector, Eas Fuel, Eas Reservoir, Catalytic Converter Assembly, Exhaust Temperature, Exhaust Gas Temperature Sensor, EAS Fuel Pressure Sensor, Hydraulic Pressure, Automatic Transmissions and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20D7 code to be stored:

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle specific diagnostic information will be required to diagnose a code P20D7. Locating a technical service bulletin (TSB) that matches the vehicle year, make, and model; as well as the engine size, code/s stored, and symptoms exhibited, could yield helpful diagnostic information.

Begin my diagnosis with a visual inspection of the EAS wiring harnesses and connectors. Burnt or damaged wiring and or connectors should be repaired or replaced before proceeding.

Continue by plugging the scanner into the vehicle diagnostic connector and retrieving all stored codes and pertinent freeze frame data. Consider writing this information down before clearing the codes.

Test drive the vehicle until the PCM either enters readiness mode or the code is reset. If the PCM enters readiness mode at this time, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions which contributed to the code being stored may need to worsen before an accurate diagnosis can be made.

If the code is immediately reset, completing the next step of the diagnosis will require that you search your vehicle information source to obtain diagnostic flow charts, connector pin-out charts, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) on all EAS fuel supply system grounds. Continue by testing the power supply to the EAS control system. Test fuses with the circuit loaded to avoid misdiagnosis.

If the appropriate power (battery voltage) and ground circuits are discovered, use the scanner to activate the EAS fuel pump and test output control circuit voltage. If voltage is insufficient, test the EAS fuel pump relay. If no input voltage is detected, suspect that the controller is bad or has experienced a programming error.

If input voltage is present on the relay but output voltage is not detected, suspect that the relay is bad. If the EAS power supply voltage output circuit is within parameters, use the DVOM to test the EAS fuel pressure sensor and fuel pump. If any of these components fails to meet manufacturer’s specifications, suspect that it has failed.

Common Mistakes When Diagnosing the P20D7 Code.

• Damaged solenoids
• Engine sensor failure
• Exhaust leak
• EAS Fuel injector failure
• DEF pump failure
• Internal engine failure
• Powertrain Control Module (PCM) software needs to be updated