P258D
Vacuum Pump Control Circuit A High
Vacuum pump control
Generic OBD-II
Medium
What it means
P258D means the ECM detected high voltage in the control circuit for vacuum pump A — typically an electric pump that supplies vacuum for the brake booster or other engine functions. It usually points to a wiring short-to-voltage or a pump/relay fault rather than an engine problem, so the engine still runs, but braking assist can suffer on vehicles that rely on this pump.
Medium
Can I keep driving? Usually drivable, but if the pump supplies brake-booster vacuum the pedal can feel hard — get it checked promptly.
Common symptoms
What you'll notice
- Check-engine light on with the code stored
- Firmer or heavier brake pedal if the pump feeds the brake booster
- Vacuum pump not running or running erratically
- No obvious driveability change on some vehicles
Common causes
Most likely first
- Short to voltage in the vacuum-pump control wiringLikely
- Damaged or corroded connector at the pump or ECMCommon
- Faulty vacuum pump, relay, or driverCommon
- Faulty ECM control-circuit outputLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the fault set.
- Inspect the pump connector and control wiring for a short to power or chafing.
- Test the pump relay/driver and the pump's resistance against spec.
- Confirm the pump runs on command; replace it if seized or open.
- If wiring and pump check out, test the ECM output. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P258D?+
Often yes, but on vehicles where this pump supplies brake-booster vacuum, braking can require more pedal effort. Have it checked soon.
Can I just clear P258D?+
It will return until the circuit fault is fixed. Clearing only masks the problem, not the underlying wiring or pump issue.
Related codes
Often seen with P258D
Read & clear P258D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX