OBD-II code · Powertrain (generic, extended)
P2519 A/C Request A Circuit
General electrical fault on the A/C compressor request input A. This input tells the ECM that the HVAC controller wants the A/C compressor engaged. With the input invalid, the ECM cannot enable the compressor clutch — A/C does not cool, idle-up compensation is not applied.
Is it safe to drive with P2519?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen or shorted A/C request wire
- PossibleHVAC module not transmitting the request
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.4–2 h
- Emissions test
- Usually unaffected
- Parts involved
- AC Request Input A, HVAC Module
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.