P2529Vacuum Reservoir Pressure Sensor Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2529 covers a vacuum reservoir pressure signal that drops out or jumps for short moments rather than staying wrong. The engine module notices changes faster than a reservoir could physically empty or fill, or brief excursions to the electrical limits that recover again. Loose terminals, a cracked wire flexing with the engine, a harness rubbing on the pump bracket or moisture entering the connector are typical, and the fault often vanishes in the workshop. No maker documents P2529 publicly. CARB still expects circuit monitoring of such comprehensive component inputs, and the reservoir itself is the vacuum store a separate pump keeps up. Steady faults are P2527 and P2528.
- What you may notice
- Check engine light comes and goes
- Occasional brief loss of power or boost
- Likely causes
- LikelyLoose or spread terminal in the sensor connector
- PossibleHarness chafing or wire breaking under engine movement
- RareMoisture entering the connector
- 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: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.