What does code P258B mean?

Q: What does code P258B mean?

Vacuum Pump Control Circuit A Range/Performance. P258B indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the control circuit for the vacuum pump, which is often used for brake assist or emission-related vacuum supply. The computer monitors the circuit for expected voltage or current behavior and sets this code when the signal does not match the commanded state within the calibrated range.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P258B

P258BVacuum Pump Control Circuit A Range/Performance

P258B indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the control circuit for the vacuum pump, which is often used for brake assist or emission-related vacuum supply. The computer monitors the circuit for expected voltage or current behavior and sets this code when the signal does not match the commanded state within the calibrated range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.