A/C Request Circuit Malfunction
The P2522 code indicates a problem in the A/C request circuit, which is the electrical path that sends a signal from the A/C controls to the Powertrain Control Module (PCM) to engage the A/C compressor. This circuit includes the A/C switch, pressure sensors, relays, and wiring. When the PCM detects an abnormal voltage or resistance in this circuit, it sets the code. Common causes include a faulty A/C pressure sensor, a defective A/C relay, a blown fuse, or wiring issues such as shorts, opens, or corrosion. The A/C system may not operate, or the compressor may not engage.
01. Most Common Causes
- Faulty A/C pressure sensor
- Defective A/C relay
- Blown A/C fuse
- Open or shorted wiring in the A/C request circuit
- Faulty A/C control module or switch
02. Symptoms You Will Notice
- A/C system does not blow cold air
- A/C compressor does not engage
- A/C blower motor may still work
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for additional related codes.
Step 2: Inspect the A/C fuse and replace if blown.
Step 3: Check the A/C relay by swapping with a known good relay or testing with a multimeter.
Step 4: Test the A/C pressure sensor signal voltage and reference voltage at the sensor connector.
Step 5: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 6: If all else is fine, test the A/C control module or switch for proper output.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the A/C will not work. In hot weather, this can be uncomfortable and may affect defogging ability.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the root cause. A simple fuse replacement is cheap, while a pressure sensor or relay replacement may cost more.