P2529
Vacuum Reservoir Pressure Sensor Circuit Intermittent
The sensor signal jumps or drops out intermittently — loose connector, vibration, or chafed harness. The ECM filters short transients but flags the input when noise exceeds limits.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Loose connectorCommon
- Chafed harnessPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Vacuum Reservoir Pressure Sensor
- Sensor Wiring
P2529 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.