A/C Request Circuit High Voltage
The P2524 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition on the A/C request circuit. This circuit carries a signal from the A/C control head to the PCM, which then engages the A/C compressor clutch. A high voltage reading suggests a short to power, a faulty A/C pressure sensor, or a problem with the PCM itself. This can prevent the A/C system from operating correctly.
1. Most Common Causes
- Short to power in the A/C request circuit wiring
- Faulty A/C pressure sensor
- Defective A/C control head
- Failed PCM
2. Symptoms You Will Notice
- A/C compressor not engaging
- No cold air from vents
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for other related codes.
Step 2: Inspect the A/C request circuit wiring for shorts to power or ground.
Step 3: Test the A/C pressure sensor and replace if out of spec.
Step 4: Check the A/C control head signal and replace if faulty.
Step 5: If all else fails, test the PCM and replace if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the A/C will not work. Driving without A/C is safe, but if the underlying issue causes a short, it could drain the battery or affect other systems.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but costs can vary depending on the root cause and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.