P2522A/C Request B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2522 is the general circuit code for a second wired A/C request input, B. Why an engine module would need two such lines is left to each maker; plausible uses are a separate rear evaporator, a second request stage or a redundant line to cross-check input A. The common purpose stays the same: the module must learn of the coming compressor load in time to adjust idle and torque. CARB has required monitoring of electronic A/C components since the 2006–2008 phase-in, provided switching the A/C alters fuel or spark control. In networked systems, such as the 2011 Saab 9-5 that receives its A/C request as a CAN message, no such wire exists. No maker documents P2522 publicly. P2523 and P2524 denote low and high levels on B, P2519 the fault on input A.
- What you may notice
- A/C function served by input B unavailable
- Idle dips when the compressor engages without notice
- Likely causes
- LikelyInput B wire broken or connector loose
- PossibleSending climate module or switch faulty
- 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.