P25EE
Vacuum Pump Control Circuit B / Open
The controller cannot drive the secondary electric vacuum pump (B). Brake servo or HVAC actuators that depend on engine vacuum may not get enough vacuum during low-load operation or with engine off in stop-start mode.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open pump motor winding or worn brushesCommon
- Broken control wire between ECU and pumpPossible
Parts involved
- Vacuum Pump B
- Pump Relay
- Wiring Harness
P25EE 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.