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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P258A

P258AVacuum Pump Control Circuit A/Open

P258A indicates that the powertrain control module (PCM) has detected an open circuit in the control circuit for the vacuum pump, which is used on some engines to provide brake assist vacuum or to operate emission-related vacuum actuators. The PCM commands the pump on and monitors the circuit for expected voltage or current, and it sets this code when the circuit remains open, meaning no continuity or an unexpected high resistance is present.

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage