What are the common causes of P2519?

An open or short in the A/C request A circuit. A failed A/C request switch or sensor. Corrosion at the A/C request A connector. An ECM that does not read the request.

Read the A/C request A status on a scan tool. Test the A/C request A circuit for open and short faults. Check the A/C request A connector for corrosion. Press the A/C request switch and watch the status change. Replace the A/C request switch if the circuit tests good. Clear the code and retest.

P2519

A/C Request A Circuit

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P2519 means A/C Request A Circuit.

Check these first

An open or short in the A/C request A circuit
A failed A/C request switch or sensor
Corrosion at the A/C request A connector
An ECM that does not read the request

What to do next

Read the A/C request A status on a scan tool
Test the A/C request A circuit for open and short faults
Check the A/C request A connector for corrosion
Press the A/C request switch and watch the status change
Replace the A/C request switch if the circuit tests good
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.