P258C
Vacuum Pump Control Circuit A Low
The electric vacuum pump control circuit reads stuck low — short to ground or low-side driver stuck on. The pump may run continuously, drawing current and overheating, until the ECM disables the channel.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
Parts involved
- Vacuum Pump
- Wiring Harness
P258C 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.