A/C Request A Circuit
The P2519 code means the vehicle's onboard diagnostic system has detected: A/C Request A Circuit. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- A/C does not turn on when requested
- A/C button light may not illuminate
- Check engine light on
- Blower motor works but no cold air
Probable Causes (Ranked by Likelihood)
- Faulty A/C request switch or button Very High
- Open circuit in A/C request wiring High
- Failed A/C control module Moderate
- ECM not receiving A/C request signal Low
Step-by-Step Diagnostic Procedure
-
Test A/C switch operation with multimeter
-
Check A/C request circuit wiring for continuity
-
Verify A/C request signal at ECM connector
-
Scan A/C control module for additional codes
Frequently Asked Questions
Why won't my A/C turn on with P2519?
P2519 means the ECM is not receiving the signal that you pressed the A/C button. The request never reaches the engine computer to engage the compressor.
Is this the same as low refrigerant?
No. P2519 is an electrical circuit issue with the A/C request signal, not a refrigerant charge problem. The A/C system itself may be fully charged.
Can a faulty climate control panel cause P2519?
Yes. If the climate control module or A/C switch fails to send the request signal, the ECM will set P2519.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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