P2522 - OBD Trouble Code

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The trouble code P2522 can be elucidated as A/C Request B Circuit. 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. The refrigerant pressure through the air conditioning (A/C) pressure sensor is being monitored by the engine control module. This trouble code would be set by the ECM when the signal from the sensor would not be as per the specifications set by the manufacturer.

This error code would start indicating when the PCM has detected a voltage reading from a specific a/c refrigerant pressure sensor that would not fall within acceptable limitations. You can always consult the automobile service manual for the location of this particular sensor/switch.

What causes this problem with the A/C Request B Circuit?

• The pressure in the system might be excessive
• Malfunctioning A/C refrigerant pressure switch or sensor
• The system circuitry might be unlocked
• There might be a bad climate control head
• There can be distorted connector

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
3. A/C compressor - Sometimes loud noises might start coming when there is a failure in the AC compressor. So it is very important to replace the A/C compressor with us at equitable prices.
4. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
5. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P2522 error. Buy new diagnostic tools and equipment for us.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Visibility in the check engine light
• The car air conditioning system might not function properly
• Appearance of the A/C “ON” light

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Repair or replace the quirky A/C refrigerant pressure sensor
• The malfunctioning A/C compressor switch should be repaired or replaced as per the need
• You must fix the leaks in the system
• Make sure to mend the faulty wiring or connectors
• It is essential to add refrigerant
• Carefully adjust the faults in the high pressure switch

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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 average automotive AC system utilizes between one and four refrigerant pressure switches so that it can provide safe and efficient operation. Freon is utilized to distribute oil throughout the air conditioning system, so you can see that refrigerant pressure is crucial to a/c system longevity and operation. The pressure switches can be threaded onto metal a/c lines or inserted into the compressor. These switches are generally of a pressure sensitive "ON/OFF" design. Now as the pressure would rise in the a/c system it would press against spring tension in the low pressure switch. When sufficient pressure is reached for proper system operation, then the contacts which are inside of the switch would be closed and the compressor clutch electrical circuit is completed, thus it would allow the clutch to engage. The high pressure switches would operate in the same manner. When system pressure would become excessive, then it would press against spring tension inside the switch. When system pressure reaches a level that could be detrimental to the compressor and other major components, contacts inside the switch are opened and the electrical circuit for the a/c compressor is opened, which would cause the a/c clutch to disengage. Repeated failures (usually 3) of this nature are recorded by the powertrain control module. After a predetermined number of failure cycles would be completed, then this error code would be stored and there would be an illumination in the service engine soon lamp. Some models also disable the a/c compressor clutch until the code has been cleared. Several tools would be required to successfully diagnose this fault code. This is a general type of error code which is diagnosed with the help of a scanner. The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data. If he happens to find any additional error codes, he has to address them as well. Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears. If the error code does not return, then there can be an erratic condition. 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. Make sure to retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components appear to be in good working condition, connect the scanner (or code reader) to the diagnostic connector. Then the freeze frame data should be recorded. This information would be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored. You should continue by clearing the code and operating a vehicle to see if it returns. This will help to determine whether or not the malfunction is intermittent. Now once all the codes are cleared, then you should test drive the vehicle to see if the code returns. If the code fails to immediately return, then it is an indication that you have an intermittent condition. Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases it should be allowed to worsen before a right diagnosis can be made. Connect the scanner or code reader and then record all stored trouble codes as well as freeze frame data. All the codes should be cleared up, then connect the a/c gauges, carefully start the car engine and then turn the a/c on high. The pressure gauge readings should be observed carefully. If the low pressure gauge reading drops below 29 psi, and compressor clutch engagement is disabled, suspect a low freon condition. Slowly add freon until the low pressure reading is approximately 35 psi (monitor high side pressure as well - it should maintain around 225 psi). If the compressor clutch is engaged and the a/c system begins to cool normally, check for leakage in the freon and then it should be repaired as per the requirement. If system pressure exceeds the manufacturer's minimum specifications (usually 30 psi) and the compressor clutch fails to engage, then it would indicate that there are some faults in the low refrigerant pressure sensor. Check for voltage and ground signals at the low pressure switch electrical connector. Compare your actual findings with manufacturer's specifications and repair open or shorted circuits as needed. If voltage and ground signals coincide with the specifications set by the manufacturer, then test the low pressure switch resistance utilizing the digital volt/ohmmeter. Compare your findings to the specifications set by the manufacturer and replace the switch as per the requirement. Then all the codes should be cleared up, connect the a/c gauges, start the engine and turn the a/c on high. The readings of the pressure gauge should be carefully observed. If the high pressure gauge reading exceeds the manufacturer's maximum specification (usually 275 to 300 psi), turn the a/c system off and the pressure should be allowed to decrease. Turn the a/c back on and observe the electric condenser fan (if so equipped) operation. If the electric cooling/condenser fan/s are not working, diagnose the cause of this issue. Lack of electric cooling/condenser fan operation will cause high pressure to soar. If the fan is working and a/c system pressure exceeds maximum recommended specs, suspect a restriction in the orifice, expansion valve, accumulator, receiver dryer, or condenser. If the high pressure reading is within specs and the compressor clutch fails to engage due to a high pressure condition, perform a resistance test on the high pressure switch and compare your findings with manufacturer's specifications. Restore the high pressure switch as required. If the switch does fall within acceptable specifications, examine continuity in the system circuit. Repair or replace defective electrical wiring and connectors as per the requirement. If a/c refrigerant pressure switches and circuitry fail to yield the cause of this malfunction, suspect a quirky climate control head or a/c compressor switch. Check the unit according to specifications set by the manufacturer and replace components as needed.

Common Mistakes When Diagnosing The P2522 Code

• A/C compressor might start failing
• Some issues related to the A/C compressor relay
• There might be defects in the powertrain control module
• Issues with the car wiring