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P2525

Vacuum Reservoir Pressure Sensor Circuit

General electrical fault on the vacuum reservoir pressure sensor circuit. The reservoir stores manifold or pump-generated vacuum for systems like brake booster, EGR actuators or HVAC dampers. Without a valid reading the ECM disables vacuum-pump duty cycle control.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Open or shorted wiring to the sensorCommon
  • Failed sensor elementPossible

Parts involved

  • Vacuum Reservoir Pressure Sensor
  • Sensor Wiring

P2525 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.