P258B: Vacuum Pump Control Circuit A Range/Performance
Standardized SAE J2012 code · P25xx — Auxiliary inputs
What does P258B mean?
The vacuum pump control circuit is electrically intact, but the pump response does not match the model — pump runs longer than expected to reach setpoint, current draw rises (mechanically tight) or vacuum does not build at all. Aged motor brushes, dry vanes or a leaking line are typical causes.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Aged motor brushes or dry vanes
- Medium Leaking vacuum line
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
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P258B in the community
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