P2524A/C Request B Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P2524 indicates that A/C request input B reads above the level the engine module treats as valid. A line chafed against battery or ignition feed, an open pull-down inside the module or a control unit that latches its output high are the usual explanations. Ford is the one maker found to list it: its 2014 BOSS 302S code list shows P2524 without a lamp mark, just like its A-side counterpart P2521; no thresholds are given. A heavy-duty bulletin from Mack mentions a P252400 on MP10 engines, but in an oil pressure context, so that use is maker-specific and unrelated. CARB A/C monitoring applies only where the request alters fuel or spark control. P2523 is the low side, P2522 the general fault on B. Expect A/C behaving on its own.
- What you may notice
- Compressor engages although not requested
- A/C cannot be switched off or on as expected
- Likely causes
- LikelyInput B wire shorted to battery or ignition voltage
- PossibleSending module output latched high
- 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.