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P2522 is a diagnostic trouble code (DTC) for "A/C Request B Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Diagnostic trouble code P2522 is defined as A/C Request B Circuit.
When your vehicle’s computer sets this code, it means that a problem has been detected in the signal sent to the PCM (powertrain control module) from the air conditioning refrigerant pressure sensor.
Signals received by the PCM are interpreted as voltage readings in order to make it easier for the computer to detect a problem. If there are fluctuations in air conditioning system pressure, the PCM gets the message via voltage fluctuations, telling it that the system is producing either too much or too little pressure.
While the most common cause of this code is low refrigerant in the A/C system, other factors can come into play as well, including:
You’ll likely see an illuminated malfunction indicator light (MIL), in addition to the stored trouble code. The most uncomfortable symptom will be that the air conditioning may not work. If the system is disabled, the A/C “ON” light, typically located on the A/C switch, may flash repeatedly.
The mechanic’s diagnostic process may include:
Refrigerant should not be added without verifying that the system is not overfilled. This can result in catastrophic system damage. The system should be thoroughly diagnosed, and both low pressure gauge and high pressure gauge readings observed to ensure the correct amount of pressure is moving through the system.
Obviously there are much more serious issues than the A/C request B circ fault. But if you live in an area with high temperatures, it could become a very uncomfortable situation very quickly. In general, however, you won’t have to worry about serious drivability or damage to vital operational components.
Repairing the A/C system may involve:
Technicians recommend not attempting to use single-hose charging kits which are widely available these days. These kits do not include gauges, which can result in overfilling the system and causing even more expensive damage.
Air conditioning problems should generally be handled by a qualified mechanic who is certified to handle refrigerant according to federal laws. There are specific regulations governing the disposal of this chemical, making it wiser to simply have your vehicle repaired by a professional who has the proper tools (like A/C gauges and an A/C recycling machine) to handle the job properly.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.