P2056 OBD Error Code: Problem & Solutions

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. Electronic Control Unit – The ECU coordinates with the temperature sensor to control the blower fan for keeping the battery temperatures under control. So, replace faulty ECU components now!
3. 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.
4. Fuel Injector - Faulty fuel injector, it will cause rough idles and difficulty in starting. Also, it will affect the fuel economy and engine performance. Fuel injector can also crack or break leading to leakages and should be replaced immediately.
5. 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!
6. Powertrain Control Module – Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
7. Oxygen Sensor – Inspect for faulty O2 sensor that can affect the engine combustion process and the exhaust emissions. Thus, it is important to understand its importance and replace faulty oxygen sensor now!
8. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

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

• As an initial step the mechanic will carefully inspect the vehicle with the help of a scanner.
• After this, the technician will connect a scanner to the diagnostic code so that he can recover all the codes and freeze frame data.
• Note down this information as it can clearly help for further diagnosis.
• After careful inspection, he will reset the code and test drive your vehicle to check for reappearance of the codes.
• He will know that an intermittent condition persist, if the code does not return instantly.
• Then the process of diagnosis should start. The mechanic should visually inspect the reductant heater system harnesses as well as connectors.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• After that all the stored codes as well as freeze frame data should be retrieved.
• This information should be written down before clearing the codes and then the vehicle should  be take out for a test drive unless and until the powertrain control module would enter the readiness mode or the code is reset.
• Now if the PCM enters readiness mode, then it would that this code is intermittent and might be very difficult to diagnose it.
• If this is the real case, then you should allow the conditions which have given contribution in storing this code to worsen before the correct diagnosis can be made.
• Carefully reset the code and then the source of vehicle information to get diagnostic flow charts, connector pin out charts, connector face views, as well as component testing procedures and specifications should be searched.
• This information would be very helpful in completing the next step of your diagnosis. The DVOM should be used to check the power supply to the SCR control system.
• The fuses with the circuit loaded should be inspected so that the misdiagnosis can be avoided.
• Now if the right power (battery voltage) and ground circuits have been located, then a scanner should be used to activate the reductant injector valve and check the output control circuit voltage.
• Then if the voltage is not sufficient, then it would that there are some faults in the controller or it might have faced a programming error. 
• If the voltage output circuit is as per the parameters set by the manufacturer, then DVOM should be used to check the reductant injection valve. If the valve is not as per the specifications set by the manufacturer, then it would mean that it has a failure. It is very important to replace it.
• Most often, whenever the mechanic carries out any repair work, he will reset the code and test drive your car, to check if the codes return immediately.
• This can preferably help the mechanic to know what caused this error code in the vehicle.

Common Mistakes When Diagnosing The P2056 Code

• Many a times the mechanics get confused about the identity of the oxygen sensor and the reductant injector as both of them are situated in the exhaust or near the catalyst converter. This would cause a lot of trouble and simply replacing the oxygen sensor would not lead to a successful diagnosis.
• A big mistake of overlooking any defective wiring to the reductant injector.
• The technician might not diagnose the throttle position sensor, coolant temperature sensor, mass airflow sensor, and manifold absolute pressure sensor diagnostic trouble codes, if stored, along with the P2056 diagnostic trouble code.