P2524 OBD Error Code: Problem & Solutions

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The trouble code P2524 can be explicated as A/C Request "B" Circuit High. 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.

It is the engine control module which would examine the refrigerant pressure through the air conditioning (A/C) pressure sensor. This trouble code would be set by the ECM when the signal from the sensor would not be as per the parameters set by the manufacturer.

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

• Less freon condition in the air conditioning system.
• Immoderate system pressure
• Imperfect a/c refrigerant pressure switch
• Quirks in the electrical connectors
• Defective wiring
• The climate control head might be damaged

1. A/C compressor - Are you experiencing higher than normal cabin temperatures, loud sounds when the compressor is running, and the compressor clutch not moving? If yes, then you must buy top notch A/C compressor from us at economical prices.
2. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
3. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
4. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
5. Diagnostic Tool - Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2524 here:

Common Symptoms

• Illumination in the service engine soon light
• Air conditioning system not working properly
• Disabled air conditioning system
• The "ON" indicator lamp (usually in the a/c switch) might start flashing

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 P2524:

• The malfunctioning wiring or connectors should be repaired or replaced as per the need
• Make sure to mend the leaks in the system
• It is very important to add refrigerant
• The A/C refrigerant pressure sensor should be restored to working order
• Recondition the non-functioning A/C compressor switch
• Adjust the flawed high pressure switch 

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• 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 P2524 Code

• A/C compressor relay related issues
• Quirks in the A/C compressor
• Failure in the PCM
• Issues related with the car wiring