What Does P2519 Mean?
The PCM has detected a fault in the A/C request circuit A, which communicates the driver's demand for air conditioning. The signal from the A/C control module or switch is not being received properly by the PCM.
Common Causes
35%
Faulty A/C control switch or panel
30%
Wiring fault in A/C request circuit between control module and PCM
20%
Failed A/C control module or climate control unit
10%
Damaged connector at PCM or control module
5%
PCM internal circuit failure
Diagnostic Steps
1
Step 1: Verify A/C control switch operation and check for proper illumination/response when pressed
2
Step 2: Monitor A/C request signal at PCM using scan tool live data while activating A/C switch
3
Step 3: Check for voltage or ground signal (depending on system design) at A/C request circuit wire at PCM connector
4
Step 4: Inspect wiring and connectors between A/C control module and PCM for damage or corrosion
5
Step 5: Test A/C control module power and ground circuits to ensure proper module operation
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the A/C request circuit A, which communicates the driver's demand for air conditioning. The signal from the A/C control module or switch is not being received properly by the PCM.
The most common cause of P2519 (A/C Request "A" Circuit) is: Faulty A/C control switch or panel
Typical repair costs for P2519 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety risk. A/C system will not engage when requested, affecting comfort only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2519 to identify the root cause.
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Quick Info
Category
Powertrain
System
A/C System and Climate Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
