What Does P2523 Mean?
The PCM has detected a low voltage condition on the A/C request circuit 'B'. This secondary A/C request signal is reading below the acceptable voltage threshold, indicating a short to ground or circuit fault.
Common Causes
40%
Short to ground in A/C request 'B' circuit wiring
25%
Failed climate control module with shorted output driver
20%
Damaged A/C pressure sensor or switch in 'B' circuit
15%
Water intrusion or corrosion at connectors causing short circuit
Diagnostic Steps
1
Step 1: Locate the source of A/C request 'B' signal using wiring diagrams (may be passenger zone control or pressure switch)
2
Step 2: Disconnect the signal source component and measure resistance to ground on signal wire; should be open circuit
3
Step 3: Check for voltage at signal source connector with component disconnected and ignition on
4
Step 4: Inspect wiring route for damage, especially where harness passes through body panels or near sharp edges
5
Step 5: If wiring tests normal, test signal source component for internal short or replace with known-good unit
Estimated Repair Cost
$100 - $550
Parts + labor, varies by vehicle and location
The PCM has detected a low voltage condition on the A/C request circuit 'B'. This secondary A/C request signal is reading below the acceptable voltage threshold, indicating a short to ground or circuit fault.
The most common cause of P2523 (A/C Request "B" Circuit Low) is: Short to ground in A/C request 'B' circuit wiring
Typical repair costs for P2523 range from $100 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety concerns; secondary A/C control circuit affected but primary A/C operation usually maintains basic functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2523 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Climate Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
