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, requesting compressor engagement. A high voltage reading typically points to a short to power, a faulty A/C pressure sensor, or a problem with the PCM itself. This can prevent the A/C compressor from engaging, leading to no cooling.
01. Most Common Causes
- Short to battery voltage in A/C request circuit
- Faulty A/C pressure sensor
- Failed PCM
02. Symptoms You Will Notice
- A/C compressor does not engage
- No cold air from vents
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to check for additional codes and verify P2524 is present.
Step 2: Inspect the A/C request circuit wiring for shorts to power or damage.
Step 3: Test the A/C pressure sensor signal voltage with a multimeter; compare to specifications.
Step 4: If wiring and sensor are OK, suspect a faulty PCM and perform further diagnostics.
04. Commonly Affected Makes
05. 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 other problems, it may affect engine performance.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, depending on the cause. Replacing a pressure sensor costs around $50-$100, while PCM replacement is more expensive.