P2519A/C Request A Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2519 covers the general circuit fault of a wired input through which the climate control asks the engine module for compressor operation. The engine module needs this request early, to raise idle speed, add torque reserve and then energise the compressor clutch relay. CARB therefore demands monitoring of electronic A/C components wherever switching the A/C changes fuel or ignition control, phased in from 2006 to 2008. Many current cars carry the request over CAN instead – Saab's 2011 9-5 is an example, with the HVAC module sending it as a message – and then network faults appear as U-codes rather than P2519. No maker documents P2519 publicly. P2520 and P2521 name a low or high level on the same input, P2522 the second input B. Expect A/C that does not start.
- What you may notice
- A/C compressor never engages
- Idle speed does not rise when A/C is selected
- Likely causes
- LikelyRequest wire broken or connector loose
- PossibleClimate control unit or A/C switch not sending a valid signal
- RareEngine module input stage faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.