P2440 - OBD Trouble Code

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 P2440 trouble code would indicate that secondary air injection system is not as per the predetermined limit has been detected by the PCM. 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 Secondary Air Injection System Switching Valve Stuck Open Bank 1?

• Defaults in the secondary air system relay
• Unlocked secondary air system relay harness
• Unsatisfactory electrical connection in the secondary air system relay circuit
• Malfunctioning secondary air injection system pump
• There can be inoperative air injection valve
• Malfunctioning one-way check valve
• The pressure sensor might be flawed
• Some issues related to the pressure sensor wiring that is frayed, broken, or shorted
• Unusable pressure sensor connector
• There can be distorted vacuum switching valve
• Vacuum switching valve wiring might be frayed, broken, or shorted
• Defective Vacuum switching connector
• Vacuum switching connector might have bent pins

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P2440 code by mentioning some major symptoms below:

Common Symptoms

• Secondary air injection system might be disabled
• Illumination of the check engine light
• Sometimes there might be noisy secondary air injection system
• Engine might start stalling when idling
• Engine may stall when starting the automobile
• Engine hesitation when accelerating
• P2440 diagnostic trouble code might be stored in the powertrain control module
• There might be no obvious symptoms
• Some noises might start coming from engine compartment

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 P2440:

• It is essential to restore the flawed secondary air injection system relay
• Repair or replace the quirky PCM/ECM
• Rehabilitate the defaults in the secondary air injection system relay harness
• Carefully adjust the faults in the secondary air injection system relay circuit
• Recondition the non-functioning secondary air injection system pump
• You must fix the defective air injection valve
• Make sure to mend the faulty one-way check valve
• The malfunctioning pressure sensor should be repaired or replaced as per the need
• The pressure sensor connector should be restored to working order
• It is necessary to perform proper service of the unsound vacuum switching valve

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

• 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.
• Most often he has to inspect the solenoid itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed.
• This error code might be difficult to diagnose if the powertrain control module would enter readiness mode because the code might be intermittent.
• You should allow the condition to get worse before the correct diagnosis can be made.
• Now if you find out that the code is restored, then the process of diagnosis should be continued.
• Make sure to obtain connector face views, connector pinout charts, component locator charts, wiring diagrams, and diagnostic flow charts by utilizing the source of vehicle information.
• A visual inspection of the associated wiring and connectors should be performed.
• Make sure to repair or restore the wiring which has been cut, burned, or damaged.
• The DVOM should be used to inspect the secondary air injection system control voltage at the appropriate connector pin.
• Now if no voltage has been detected, then the system fuses should be inspected.
• The fuses which are faulty should be replaced as per the requirement.
• Once the voltage has been detected, the check the corresponding circuit at the PCM connector.
• If no voltage has been detected, then you must suspect an open circuit between the sensor and the powertrain control module.
• If there is voltage, then it would mean that there are some faults in the powertrain control module or PCM programming error.
• The automobiles in extremely cold climate conditions often experience secondary air injection pump failure from frozen condensation.
• Every time a repair work is carried out, make sure that the mechanic test drives the vehicle after every repair so that the diagnosis is successful. This can eventually help him to know as to where the error occurred.

Common Mistakes When Diagnosing The P2440 Code

There a lot of cases where this error code is caused due to defective one-way check valves. So that is the reason why it is essential to inspect them properly to prevent a misdiagnosis and multiple secondary air injection pump replacements. Make sure to add a drain tube onto the pump housing when restoring the secondary air injection pump, because failure in doing this would cause a lot of failures in the secondary air injection pump.