What Does P2524 Mean?
The PCM has detected an abnormally high voltage signal on the air conditioning request circuit B. This indicates a short to voltage or faulty wiring in the A/C control system communication line.
Common Causes
35%
Short to voltage in A/C request wiring harness
30%
Faulty A/C control switch or module
20%
Failed PCM internal A/C request circuit
15%
Corroded or damaged connector pins at PCM
Diagnostic Steps
1
Step 1: Use a multimeter to check voltage on the A/C request B circuit at the PCM connector with ignition on
2
Step 2: Inspect the A/C request circuit wiring for shorts to power, damaged insulation, or pinched wires
3
Step 3: Disconnect the A/C control module and recheck circuit voltage to isolate the short
4
Step 4: Test the A/C control switch/module operation and resistance values per manufacturer specifications
5
Step 5: If all external components test good, suspect internal PCM failure on A/C request circuit
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal on the air conditioning request circuit B. This indicates a short to voltage or faulty wiring in the A/C control system communication line.
The most common cause of P2524 (A/C Request "B" Circuit High) is: Short to voltage in A/C request wiring harness
Typical repair costs for P2524 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concern. A/C system may not function properly, affecting driver comfort and windshield defogging capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2524 to identify the root cause.
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Quick Info
Category
Powertrain
System
A/C Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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