P2525Vacuum Reservoir Pressure Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2525 is the general circuit fault of the pressure sensor on a vacuum reservoir. Diesels, and many hybrids and electric drives, lack usable intake vacuum and run a separate pump, often driven from the camshaft or by an electric motor, that fills a reservoir. That stored vacuum serves the brake booster and, on many diesels, pneumatic actuators for EGR, turbocharger control, swirl flaps or an exhaust brake. The sensor, normally a three-wire part with 5 V reference, lets the engine module verify the supply. CARB counts such inputs among comprehensive components that need circuit checks whenever they can affect emissions or other monitors. No maker documents P2525 itself. P2526 to P2529 split out plausibility, low, high and intermittent faults. Actuators may fall back to defaults.
- What you may notice
- Check engine light depending on maker
- Reduced boost or EGR function in default mode
- Likely causes
- LikelySensor wiring open or connector loose
- PossibleReservoir pressure sensor defective
- RareShared 5 V reference disturbed by another sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.