Guide To P2052 OBD Error Code Solutions

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The trouble code P2052 can be described as Reductant Injection Valve Circuit High Bank 2 Unit 1. The error code P2052 would start triggering when the PCM would detect some fault in reductant injection valve circuit. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code. The P2052 trouble code would indicate that a reductant injection valve circuit which is not as per the predetermined limit has been detected by the ECM. Now when this would occur, the fault code would be stored and there would be an illumination in the malfunction indicator light.

What causes this problem with the Reductant Injection Valve Circuit High Bank 2 Unit 1?

• Malfunctioning reductant injection valve
• The reductant injection valve control circuit is open or shorted
• Not enough DEF in the reservoir
• Defaults in the SCR controller/PCM or programming error

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Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P2052 code by mentioning some major symptoms below:

Common Symptoms

• Illumination in the service engine soon light
• Sometimes there might be no visible symptoms present
• Black smoke might start emitting from the tailpipe during acceleration
• The overall engine performance might start declining
• Decrease in the fuel efficiency

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2052:

• It is essential to restore the flawed reductant injection valve control circuit
• Repair or replace the quirky engine control module
• Rehabilitate the defaults in the reductant injection valve
• Carefully adjust the faults in the SCR controller/PCM or programming error
• Recondition the non-functioning electronic control unit

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

• Use an OBD-II scanner in order to verify that the code is present, and check for other codes for any other type of error or problem that might need attention.
• The current data along with freeze frame data are recorded, and the codes are then cleared to see if they reoccur.
• The vehicle is inspected for any problems with the wiring and connectors to check for loose connections, corrosion, or shorts.
• 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.

Common Mistakes When Diagnosing The P2052 Code

Many a times the mechanics get confused about the identity of the oxygen sensor and the exhaust gas temperature sensor. This would cause a lot of trouble and simply replacing the oxygen sensor would not lead to a successful diagnosis.